CN103546110A - Attenuation control voltage determining method, attenuation control voltage determining device and ALC (automatic level control) circuit - Google Patents
Attenuation control voltage determining method, attenuation control voltage determining device and ALC (automatic level control) circuit Download PDFInfo
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Abstract
The invention discloses an attenuation control voltage determining method, an attenuation control voltage determining device and an ALC (automatic level control) circuit. The method includes when a sampling period reaches, sampling voltage signals output by a detecting circuit in the ALC circuit to acquire sampling voltage of a current sampling period; on the basis of the sampling voltage of the current sampling period and power voltage of a previous sampling period, determining power voltage of the current sampling period; according to a preset comparison table of the power voltage and attenuation control voltage, and determining the attenuation control voltage corresponding to the power voltage of the current sampling period to serve as the attenuation control voltage of the current sampling period to be used for controlling attenuation parameters of a radio frequency attenuation circuit in the ALC circuit before the attenuation control voltage of a next sampling period is determined. By the method, the device and the ALC circuit, power control effect, on output signals of power amplification equipment, of the ALC circuit is improved.
Description
Technical field
The present invention relates to the radio-frequency technique field in communication technical field, relate in particular to a kind of decay control voltage that can be applicable to time slot signal communication equipment and determine method, device and alc circuit.
Background technology
In wireless communication system, conventionally adopt power amplifier to carry out power amplification to the signal in transmission, with the power level that guarantees that signal is enough, spread signal coverage.When power amplifier carries out the operation of power amplification to the signal receiving, when the over proof power output of power output of power amplifier, can cause signal serious distortion to affect communication quality, even damage equipment.For this problem, generally can in power amplification device, add can limiting power amplifier peak power output control, protective circuit, this circuit is called as automatic electric-level and controls (Automatic Level Control, ALC) circuit.
In power amplification device, apply after alc circuit, after the power output overrate of power amplifier, alc circuit can be processed the signal of power amplifier output, and the signal feedback that processing is obtained is to the input of power amplification device, make power amplification device adjust attenuation parameter according to the signal of this feedback, power attenuation amount to the signal of input is controlled, thereby adjust the power of the signal that inputs to power amplifier, and then the maximum signal power of limiting power amplifier output.Generally speaking, the level of the output signal after power amplification device amplifies input signal reaches after the predetermined level of alc circuit, if the power of input signal increases again, alc circuit carries out the decay of corresponding power, to keep the power stability of output signal at an expectation power, this expectation power can be called ALC power.
In actual applications, the ALC power that can be stabilized according to the signal demand of the actual characteristic of power amplifier and output, controls the variation of attenuation parameter.
Figure 1 shows that the structural representation of the power amplification device with alc circuit, this circuit can amplify the power of continuous signal, also can amplify the power of time slot signal.
The radiofrequency signal that need to process through power amplification device, an input of rf attenuation circuit 111 will be imported into, another input of rf attenuation circuit 111, by integrating amplification circuit 114 input attenuation control signals, rf attenuation circuit 111 is determined attenuation parameter according to the voltage of the attenuation control signal of input, and use definite attenuation parameter to carry out attenuation processing to this radiofrequency signal of input, then radiofrequency signal after decay is exported to power amplification circuit 12.
After the decay of 12 pairs of inputs of power amplification circuit, radiofrequency signal is carried out power amplification processing, be amplified rear radiofrequency signal, after after amplifying, radiofrequency signal can be used as the processing of power amplification device, radiofrequency signal is exported, meanwhile, can also by this amplifications afterwards radiofrequency signal export to coupling circuit 112.
After 112 pairs of these amplifications of coupling circuit, radiofrequency signal is coupled, and then radiofrequency signal after the coupling obtaining is exported to detecting circuit 113.
After 113 pairs of couplings of detecting circuit, radiofrequency signal is carried out power samples, obtains the voltage signal of quantification, and is input to an input of integrating amplification circuit 114.The magnitude of voltage of the performance number that after 113 pairs of couplings of detecting circuit, radiofrequency signal sampling obtains and the voltage signal of output has relation one to one, and the performance number that sampling obtains is larger, and the magnitude of voltage of the voltage signal of output is also larger.
One end of integrating amplification circuit 114 is transfused to this voltage signal of detecting circuit 113 outputs, the other end is transfused to reference voltage signal, for comparing with this voltage signal, and both voltage differences are amplified, be amplified rear magnitude of voltage, then to rf attenuation circuit 111 output voltages for this amplify after the attenuation control signal of magnitude of voltage.
Known based on above-mentioned alc circuit 11, the power of power amplification circuit 12 output signals is larger, the attenuation parameter of rf attenuation circuit 111 is also larger, to the pending radiofrequency signal of input radio frequency attenuator circuit 111 is carried out to effective attenuation, thereby meets the requirement of stable output signal power.
Yet, above-mentioned alc circuit is generally applicable to continuous signal to carry out the application of power amplification, for time slot signal, especially the higher time slot signal of peak-to-average force ratio, as WLAN (WLAN, Wireless Local Area Networks) signal, because the power of this signal different time-gap may differ larger, cause the voltage amplitude of voltage signal of the quantification of detecting circuit output also to change larger, thereby cause the voltage amplitude of the attenuation control signal of integrating amplification circuit output also to change larger, and then cause the attenuation parameter of rf attenuation circuit to change at short notice larger, make the attenuation degree of the pending radiofrequency signal of input power multiplying arrangement undergo mutation, cause power amplifier error vector magnitude (EVM, ErrorVectorMagnitude) index worsens rapidly, finally make alc circuit poor to the power control effect of the output signal of power amplification device, when affecting devices communicating quality, damage equipment even.
Summary of the invention
The embodiment of the present invention provides a kind of decay to control voltage to determine method, device and alc circuit, in order to solve the alc circuit that exists in prior art to the poor problem of the power control effect of the output signal of power amplification device.
The embodiment of the present invention provides a kind of decay control voltage to determine method, comprising:
When the sampling period arrives, automatic electric-level is controlled to the voltage signal of the detecting circuit output in alc circuit and sampled, obtain the sampled voltage in described current sampling period;
Described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period;
According to default power voltage and decay, control the voltage table of comparisons, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in described alc circuit.
The embodiment of the present invention also provides a kind of decay to control voltage determining device, comprising:
Voltage sample unit, for when the sampling period arrives, controls the voltage signal of the detecting circuit output in alc circuit and samples to automatic electric-level, obtain the sampled voltage in described current sampling period;
The first voltage determining unit, for described sampled voltage and the power voltage in a upper sampling period based on the described current sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period;
Second voltage determining unit, for controlling the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in described alc circuit.
The embodiment of the present invention also provides a kind of automatic electric-level to control alc circuit, comprising: rf attenuation circuit, coupling circuit, detecting circuit and signal processing unit, wherein:
Described rf attenuation circuit, for the attenuation control signal of exporting according to described signal processing unit, determine attenuation parameter, and use described attenuation parameter to carry out attenuation processing to the pending radiofrequency signal of input, and radiofrequency signal after the decay obtaining is exported to power amplification circuit and carry out power amplification processing;
Described coupling circuit, for radiofrequency signal after described power amplification circuit amplifies the amplification of processing is coupled, and exports to detecting circuit by radiofrequency signal after the coupling obtaining;
Described detecting circuit, for radiofrequency signal after described coupling is carried out to power samples, obtains the voltage signal of quantification, and exports to described signal processing unit;
Described signal processing unit, for when the sampling period arrives, samples to the voltage signal of described detecting circuit output, obtains the sampled voltage in described current sampling period; And the described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period; And control the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, and be the attenuation control signal that voltage is controlled in described decay to described rf attenuation circuit output voltage, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of described rf attenuation circuit.
Beneficial effect of the present invention comprises:
In the method that the embodiment of the present invention provides, voltage signal to the detecting circuit output in alc circuit will carry out periodic sampling, then the sampled voltage based on the current sampling period and the power voltage in a upper sampling period, determine the power voltage in current sampling period, and the power voltage in the current sampling period of determining was greater than the minimum value of this sampled voltage and the power voltage in a upper sampling period, and be not more than the maximum of this sampled voltage and the power voltage in a upper sampling period, and compared this sampled voltage power voltage in a more approaching upper sampling period, thereby make to control the voltage table of comparisons according to default power voltage and decay, voltage is controlled in the decay that power voltage determined and the current sampling period is corresponding, be subject to the impact of power voltage in a sampling period larger, thereby when the voltage amplitude short time of the voltage signal of detecting circuit output changes greatly, the voltage amplitude that voltage is controlled in determined decay can not change larger, and then make can not change larger for the attenuation parameter of the rf attenuation circuit of alc circuit, avoid the attenuation degree of the pending radiofrequency signal of input power multiplying arrangement to undergo mutation, improved the power control effect of alc circuit to the output signal of power amplification device.
The application's further feature and advantage will be set forth in the following description, and, partly from specification, become apparent, or understand by implementing the application.The application's object and other advantages can be realized and be obtained by specifically noted structure in the specification write, claims and accompanying drawing.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention with the embodiment of the present invention one, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 has the structural representation of the power amplification device of alc circuit in prior art;
The decay control voltage that Fig. 2 provides for the embodiment of the present invention is determined the flow chart of method;
The decay control voltage that Fig. 3 provides for the embodiment of the present invention is determined the detail flowchart of method;
The schematic diagram that voltage is determined sampled voltage in method, power voltage and decay control voltage is controlled in the decay that Fig. 4 A, Fig. 4 B and Fig. 4 C provide for the embodiment of the present invention;
The structural representation of voltage determining device is controlled in the decay that Fig. 5 provides for the embodiment of the present invention;
The structural representation of the alc circuit that Fig. 6 provides for the embodiment of the present invention.
Embodiment
In order to provide, improve the implementation of alc circuit to the power control effect of the output signal of power amplification device, the embodiment of the present invention provides a kind of decay control voltage to determine method, device and alc circuit, below in conjunction with Figure of description, the preferred embodiments of the present invention are described, be to be understood that, preferred embodiment described herein only, for description and interpretation the present invention, is not intended to limit the present invention.And in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
The embodiment of the present invention provides a kind of decay control voltage to determine method, as shown in Figure 2, comprising:
Step 201, when the sampling period arrives, the voltage signal of the detecting circuit output in alc circuit is sampled, obtain the sampled voltage in current sampling period.
Step 202, this sampled voltage based on the current sampling period and the power voltage in a upper sampling period, determine the power voltage in current sampling period, wherein, the power voltage in current sampling period was greater than the minimum value of this sampled voltage and the power voltage in a upper sampling period, and be not more than the maximum of this sampled voltage and the power voltage in a upper sampling period, and compare the power voltage that this sampled voltage more approached a described upper sampling period.
Step 203, according to default power voltage and decay, control the voltage table of comparisons, determine the decay control voltage corresponding with the power voltage in current sampling period, voltage is controlled in decay as the current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in alc circuit.
In the above-mentioned steps 202 of the embodiment of the present invention, this sampled voltage based on the current sampling period and the power voltage in a upper sampling period, determine the power voltage in current sampling period, is specifically as follows and adopts following formula to determine the power voltage in current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor this sampled voltage in current sampling period, k is positive integer constant, and for example, k can be 47.
Further, before the above-mentioned formula of employing is determined the power voltage in current sampling period, whether this sampled voltage that can first judge the current sampling period is not less than default sampled voltage threshold value, if be not less than, adopt above-mentioned formula to determine the power voltage in current sampling period, if be less than, determine that the power voltage in current sampling period was the power voltage in a upper sampling period.Wherein, default sampled voltage threshold value can arrange according to actual needs flexibly, for example, be set to a less value, when lower than this default sampled voltage threshold value, can be illustrated in the current sampling period, power amplification device does not have power stage, when the input signal of power amplification device is time slot signal, also can be illustrated in the current sampling period, the current time slots of this time slot signal is free timeslot, the power voltage of now determining the current sampling period was that the power voltage in a upper sampling period is constant, the impact of the sampled voltage obtaining in the time of can reducing free timeslot on power voltage, to slow down the variation tendency of the power voltage in current sampling period.
Below in conjunction with accompanying drawing, with specific embodiment, method provided by the invention is described in detail.
Fig. 3 controls for a kind of decay that the embodiment of the present invention provides the detail flowchart that voltage is determined method, specifically comprises following treatment step:
Step 301, alc circuit power on operation after, it is that voltage is controlled in the first default decay that voltage is controlled in the decay that definite attenuation parameter of controlling first the rf attenuation circuit in alc circuit is used, it is maximum attenuation parameter for controlling the attenuation parameter of rf attenuation circuit that voltage is controlled in this first default decay, thereby make to power on after operation at alc circuit, can use maximum attenuation parameter to carry out attenuation processing to the pending radiofrequency signal of input power multiplying arrangement, to prevent that the power of pending radiofrequency signal is excessive, damage power amplifier.
V0 as shown in Fig. 4 C, is the first default decay and controls voltage.
Step 302, based on the sampling period, the voltage signal of the detecting circuit output in alc circuit is sampled, obtain the sampled voltage in current sampling period.
X1-X12 as shown in Figure 4 A, is respectively the sampled voltage in 12 sampling periods of the 1st sampling period to the.
Whether step 303, the sampled voltage of determining the current sampling period are less than default sampled voltage threshold value, if be not less than, enter step 304, if be less than, enter step 305.
Step 304, adopt following formula to determine the power voltage in current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the sampled voltage in current sampling period, k is positive integer constant, and for example k value 47.
In the embodiment of the present invention, the power voltage in the 1st sampling period, can equate with the sampled voltage in the 1st sampling period, power voltage that also can be using a default power voltage as a upper sampling period, adopts above-mentioned formula to determine the power voltage in the 1st sampling period.
When the sampled voltage in step 305, current sampling period is less than default sampled voltage threshold value, the power voltage of determining the current sampling period was the power voltage in a upper sampling period.
U1-U12 as shown in Figure 4 B, is respectively the power voltage in 12 sampling periods of the 1st sampling period to the, and wherein, U2-U3, U5-U8 and U11-U12, determine by above-mentioned steps 304, and U4 and U9-U10 determine by above-mentioned steps 305.
Whether step 306, the power voltage of determining the current sampling period are greater than default power voltage threshold value, if be greater than, enter step 307, if be not more than, enter step 308.
Step 307, according to default power voltage and decay, control the voltage table of comparisons, determine that the decay corresponding with the power voltage in current sampling period control voltage, as the decay control voltage in current sampling period.
Wherein, this default power voltage is controlled the voltage table of comparisons with decay, can control needs according to the power of alc circuit, and the self attributes of power amplification device intermediate power amplifier, by reality, test and arrange, make the decay corresponding with power voltage of determining based on this table of comparisons control voltage, can control rf attenuation circuit uses corresponding attenuation parameter to carry out attenuation processing to pending radiofrequency signal, and meet the power stability of the output signal of the rear radiofrequency signal of decay after power amplification is processed on an expectation power, this expectation power can be called ALC power.
Power voltage in the table of comparisons can be the setting of step footpath according to 1dB, if cannot directly inquire the power voltage in current sampling period in this table of comparisons, decay corresponding with the immediate power voltage of power voltage in current sampling period in the table of comparisons can be controlled to voltage, be defined as the decay corresponding with the power voltage in current sampling period and control voltage, also can be according to being greater than in the table of comparisons and the most approaching and be less than and approach most two power voltages of the power voltage in current sampling period, and voltage is controlled in decay corresponding to difference, determine the decay control voltage corresponding with the power voltage in current sampling period, for example adopt following formula:
Wherein, U
kand U
k-1for being greater than in this table of comparisons and the most approaching and be less than and approach most the power voltage U in current sampling period
ntwo power voltages, V
kand V
k-1be respectively in the table of comparisons and U
kand U
k-1voltage, V are controlled in corresponding decay
nfor the power voltage U with the current sampling period
nvoltage is controlled in corresponding decay.
When the power voltage in step 308, current sampling period is not more than this default power voltage threshold value, the decay control voltage of determining the current sampling period is that voltage is controlled in the second default decay, it is minimal attenuation parameter for controlling the attenuation parameter of rf attenuation circuit that voltage is controlled in the second default decay, uses this minimal attenuation parameter can guarantee that rf attenuation circuit carries out minimal attenuation to pending radiofrequency signal.
This default power voltage threshold value in above-mentioned steps 306-step 308 can arrange according to actual needs flexibly, it may also be referred to as ALC and starts to control voltage, when power voltage be greater than when this ALC starts to control voltage, just trigger alc circuit rf attenuation circuit by the pending radiofrequency signal of input is carried out to attenuation processing, the object of controlling to reach ALC power.
V1-V12 as shown in Fig. 4 C, voltage is controlled in the decay that is respectively 12 sampling periods of the 1st sampling period to the, wherein, V1-V5, V7 and V11-V12, by above-mentioned steps 307, determine that V6 and V8-V10 are that voltage is controlled in the second default decay of determining by above-mentioned steps 308.
By above-mentioned steps 307 and the decay in determined current sampling period of step 308, control voltage, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in alc circuit, specifically can, by the attenuation control signal for this decay control voltage to rf attenuation circuit input voltage, control the attenuation parameter that the rf attenuation circuit in alc circuit is used when pending radiofrequency signal is decayed.
Further, decay can also be set and control voltage threshold,, when decay control voltage is greater than this decay control voltage threshold, rf attenuation circuit just triggers the attenuation processing to input radio frequency signal, otherwise, do not trigger.
Adopt the above-mentioned decay control voltage that the embodiment of the present invention provides to determine method, can make to control the voltage table of comparisons according to default power voltage and decay, voltage is controlled in the decay that power voltage determined and the current sampling period is corresponding, be subject to the impact of power voltage in a sampling period larger, thereby when the voltage amplitude short time of the voltage signal of detecting circuit output changes greatly, the voltage amplitude that voltage is controlled in determined decay can not change larger, and then make can not change larger for the attenuation parameter of the rf attenuation circuit of alc circuit, avoid the attenuation degree of the pending radiofrequency signal of input power multiplying arrangement to undergo mutation, improved the power control effect of alc circuit to the output signal of power amplification device, especially when power amplification device is applied in the time slot signal communication system of high peak-to-average force ratio, can obtain better power control effect.
Based on same inventive concept, the decay providing according to the above embodiment of the present invention is controlled voltage and is determined method, and correspondingly, another embodiment of the present invention also provides a kind of decay to control voltage determining device, and its structural representation as shown in Figure 5, specifically comprises:
The first voltage determining unit 502, for described sampled voltage and the power voltage in a upper sampling period based on the described current sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period;
Second voltage determining unit 503, for controlling the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in described alc circuit.
Further, the first voltage determining unit 502, specifically for adopting following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant.
Further, the first voltage determining unit 502, while being not less than default sampled voltage threshold value specifically for the described sampled voltage when the described current sampling period, adopts following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant;
When the described sampled voltage in described current sampling period is less than default sampled voltage threshold value, the power voltage of determining the described current sampling period was the power voltage in a upper sampling period.
Further, second voltage determining unit 503, also for powering at described alc circuit after operation, determine and to control first decay that the attenuation parameter of described rf attenuation circuit uses to control voltage be that voltage is controlled in the first default decay, it is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described first default decay.
Further, second voltage determining unit 503, also for controlling the voltage table of comparisons according to default power voltage and decay, before determining that voltage is controlled in the decay corresponding with the power voltage in described current sampling period, determine that the power voltage in described current sampling period is greater than default power voltage threshold value; And when the power voltage in described current sampling period is not more than described default power voltage threshold value, it is that voltage is controlled in the second default decay that voltage is controlled in the decay of determining the described current sampling period, and it is minimal attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described second default decay.
The function of above-mentioned each unit can, corresponding to the respective handling step in flow process shown in Fig. 2 or Fig. 3, not repeat them here.
Based on same inventive concept, the decay providing according to the above embodiment of the present invention is controlled voltage and is determined method, correspondingly, another embodiment of the present invention also provides a kind of alc circuit, its structural representation as shown in Figure 6, specifically comprise: rf attenuation circuit 61, coupling circuit 62, detecting circuit 63 and signal processing unit 64, wherein:
Described rf attenuation circuit 61, for the attenuation control signal of exporting according to described signal processing unit 64, determine attenuation parameter, and use described attenuation parameter to carry out attenuation processing to the pending radiofrequency signal of input, and radiofrequency signal after the decay obtaining is exported to power amplification circuit and carry out power amplification processing;
Described coupling circuit 62, for radiofrequency signal after described power amplification circuit amplifies the amplification of processing is coupled, and exports to detecting circuit 63 by radiofrequency signal after the coupling obtaining;
Described detecting circuit 63, for radiofrequency signal after described coupling is carried out to power samples, obtains the voltage signal of quantification, and exports to described signal processing unit 64;
Described signal processing unit 64, for when the sampling period arrives, samples to the voltage signal of described detecting circuit 63 outputs, obtains the sampled voltage in described current sampling period; And the described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period; And control the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, and be the attenuation control signal that voltage is controlled in described decay to described rf attenuation circuit 61 output voltages, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of described rf attenuation circuit 61.
Further, signal processing unit 64, specifically for adopting following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant.
Further, signal processing unit 64, while being not less than default sampled voltage threshold value specifically for the described sampled voltage when the described current sampling period, adopts following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant;
When the described sampled voltage in described current sampling period is less than default sampled voltage threshold value, the power voltage of determining the described current sampling period was the power voltage in a upper sampling period.
Further, signal processing unit 64, also for powering at described alc circuit after operation, to described rf attenuation circuit output voltage, be the attenuation control signal that voltage is controlled in the first default decay, it is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit 61 that voltage is controlled in the described first default decay.
Further, signal processing unit 64, also, for controlling the voltage table of comparisons according to default power voltage and decay, before determining that voltage is controlled in the decay corresponding with the power voltage in described current sampling period, determine that the power voltage in described current sampling period is greater than default power voltage threshold value; And when the power voltage in described current sampling period is not more than described default power voltage threshold value, the decay control voltage of determining the described current sampling period is that voltage is controlled in the second default decay, and be the attenuation control signal that voltage is controlled in the described second default decay to described rf attenuation circuit 61 output voltages, it is minimal attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit 61 that voltage is controlled in the described second default decay.
The embodiment of the present invention also provides a kind of frequency communication devices, comprising:
Above-mentioned alc circuit shown in Fig. 6.
The function of above-mentioned signal processing unit 64 can be corresponding to the respective handling step in flow process shown in Fig. 2 or Fig. 3, do not repeat them here, this signal processing unit 64 is also equivalent to the decay shown in above-mentioned Fig. 5 and controls voltage determining device, the function of this signal processing unit 64 can realize by software, also can realize by hardware circuit.
In sum, the scheme that the embodiment of the present invention provides, comprising: when the sampling period arrives, the voltage signal of the detecting circuit output in alc circuit is sampled, obtain the sampled voltage in current sampling period; And this sampled voltage based on the current sampling period and the power voltage in a upper sampling period, determine the power voltage in current sampling period, wherein, the power voltage in current sampling period was greater than the minimum value of this sampled voltage and the power voltage in a upper sampling period, and be not more than the maximum of this sampled voltage and the power voltage in a upper sampling period, and compare the power voltage that this sampled voltage more approached a described upper sampling period; And control the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in current sampling period, voltage is controlled in decay as the current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in alc circuit.The scheme that adopts the embodiment of the present invention to provide, has improved the power control effect of alc circuit to the output signal of power amplification device.
The decay that the application's embodiment provides is controlled voltage determining device and can be realized by computer program.Those skilled in the art should be understood that; above-mentioned Module Division mode is only a kind of in numerous Module Division modes; if be divided into other modules or do not divide module, as long as controlling voltage determining device, decay there is above-mentioned functions, all should be within the application's protection range.
The application is with reference to describing according to flow chart and/or the block diagram of the method for the embodiment of the present application, equipment (system) and computer program.Should understand can be in computer program instructions realization flow figure and/or block diagram each flow process and/or the flow process in square frame and flow chart and/or block diagram and/or the combination of square frame.Can provide these computer program instructions to the processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce a machine, the instruction of carrying out by the processor of computer or other programmable data processing device is produced for realizing the device in the function of flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame appointments.
These computer program instructions also can be stored in energy vectoring computer or the computer-readable memory of other programmable data processing device with ad hoc fashion work, the instruction that makes to be stored in this computer-readable memory produces the manufacture that comprises command device, and this command device is realized the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device, make to carry out sequence of operations step to produce computer implemented processing on computer or other programmable devices, thereby the instruction of carrying out is provided for realizing the step of the function of appointment in flow process of flow chart or a plurality of flow process and/or square frame of block diagram or a plurality of square frame on computer or other programmable devices.
Obviously, those skilled in the art can carry out various changes and modification and not depart from the spirit and scope of the present invention the present invention.Like this, if within of the present invention these are revised and modification belongs to the scope of the claims in the present invention and equivalent technologies thereof, the present invention is also intended to comprise these changes and modification interior.
Claims (16)
1. decay control voltage is determined a method, it is characterized in that, comprising:
When the sampling period arrives, automatic electric-level is controlled to the voltage signal of the detecting circuit output in alc circuit and sampled, obtain the sampled voltage in described current sampling period;
Described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period;
According to default power voltage and decay, control the voltage table of comparisons, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in described alc circuit.
2. the method for claim 1, is characterized in that, the described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period are determined and be specially the power voltage in described current sampling period:
Adopt following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant.
3. the method for claim 1, is characterized in that, the described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period are determined and specifically comprised the power voltage in described current sampling period:
When the described sampled voltage in described current sampling period is not less than default sampled voltage threshold value, adopt following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant;
When the described sampled voltage in described current sampling period is less than default sampled voltage threshold value, the power voltage of determining the described current sampling period was the power voltage in a upper sampling period.
4. the method as described in as arbitrary in claim 1-3, is characterized in that, also comprises:
At described alc circuit, power on after operation, determine and to control first decay that the attenuation parameter of described rf attenuation circuit uses to control voltage be that voltage is controlled in the first default decay, it is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described first default decay.
5. the method as described in as arbitrary in claim 1-3, is characterized in that, according to default power voltage and decay, is controlling the voltage table of comparisons, before determining the decay control voltage corresponding with the power voltage in described current sampling period, also comprises:
The power voltage of determining the described current sampling period is greater than default power voltage threshold value;
When the power voltage in described current sampling period is not more than described default power voltage threshold value, it is that voltage is controlled in the second default decay that voltage is controlled in the decay of determining the described current sampling period, and it is minimal attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described second default decay.
6. a voltage determining device is controlled in decay, it is characterized in that, comprising:
Voltage sample unit, for when the sampling period arrives, controls the voltage signal of the detecting circuit output in alc circuit and samples to automatic electric-level, obtain the sampled voltage in described current sampling period;
The first voltage determining unit, for described sampled voltage and the power voltage in a upper sampling period based on the described current sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period;
Second voltage determining unit, for controlling the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of the rf attenuation circuit in described alc circuit.
7. device as claimed in claim 6, is characterized in that, described the first voltage determining unit, specifically for adopting following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant.
8. device as claimed in claim 6, it is characterized in that, described the first voltage determining unit, while being not less than default sampled voltage threshold value specifically for the described sampled voltage when the described current sampling period, adopts following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant;
When the described sampled voltage in described current sampling period is less than default sampled voltage threshold value, the power voltage of determining the described current sampling period was the power voltage in a upper sampling period.
9. the device as described in as arbitrary in claim 6-8, it is characterized in that, described second voltage determining unit, also for powering at described alc circuit after operation, determine and to control first decay that the attenuation parameter of described rf attenuation circuit uses to control voltage be that voltage is controlled in the first default decay, it is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described first default decay.
10. the device as described in as arbitrary in claim 6-8, it is characterized in that, described second voltage determining unit, also for controlling the voltage table of comparisons according to default power voltage and decay, before determining that voltage is controlled in the decay corresponding with the power voltage in described current sampling period, determine that the power voltage in described current sampling period is greater than default power voltage threshold value; And when the power voltage in described current sampling period is not more than described default power voltage threshold value, it is that voltage is controlled in the second default decay that voltage is controlled in the decay of determining the described current sampling period, and it is minimal attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described second default decay.
11. 1 kinds of automatic electric-levels are controlled alc circuit, it is characterized in that, comprising: rf attenuation circuit, coupling circuit, detecting circuit and signal processing unit, wherein:
Described rf attenuation circuit, for the attenuation control signal of exporting according to described signal processing unit, determine attenuation parameter, and use described attenuation parameter to carry out attenuation processing to the pending radiofrequency signal of input, and radiofrequency signal after the decay obtaining is exported to power amplification circuit and carry out power amplification processing;
Described coupling circuit, for radiofrequency signal after described power amplification circuit amplifies the amplification of processing is coupled, and exports to detecting circuit by radiofrequency signal after the coupling obtaining;
Described detecting circuit, for radiofrequency signal after described coupling is carried out to power samples, obtains the voltage signal of quantification, and exports to described signal processing unit;
Described signal processing unit, for when the sampling period arrives, samples to the voltage signal of described detecting circuit output, obtains the sampled voltage in described current sampling period; And the described sampled voltage based on the described current sampling period and the power voltage in a upper sampling period, determine the power voltage in described current sampling period, wherein, the power voltage in described current sampling period was greater than the minimum value of described sampled voltage and the power voltage in a described upper sampling period, and be not more than the maximum of described sampled voltage and the power voltage in a described upper sampling period, and compare the power voltage that described sampled voltage more approached a described upper sampling period; And control the voltage table of comparisons according to default power voltage and decay, determine the decay control voltage corresponding with the power voltage in described current sampling period, voltage is controlled in decay as the described current sampling period, and be the attenuation control signal that voltage is controlled in described decay to described rf attenuation circuit output voltage, before controlling voltage in the decay of determining next sampling period, control the attenuation parameter of described rf attenuation circuit.
12. alc circuits as claimed in claim 11, is characterized in that, described signal processing unit, specifically for adopting following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant.
13. alc circuits as claimed in claim 11, it is characterized in that, described signal processing unit, while being not less than default sampled voltage threshold value specifically for the described sampled voltage when the described current sampling period, adopts following formula to determine the power voltage in described current sampling period:
U
n＝(kU
n-1+X
n)/(k+1)；
Wherein, U
nfor the power voltage in described current sampling period, U
n-1for the power voltage in a upper sampling period, X
nfor the described sampled voltage in described current sampling period, k is positive integer constant;
When the described sampled voltage in described current sampling period is less than default sampled voltage threshold value, the power voltage of determining the described current sampling period was the power voltage in a upper sampling period.
14. alc circuits as described in as arbitrary in claim 11-13, it is characterized in that, described signal processing unit, also for powering at described alc circuit after operation, to described rf attenuation circuit output voltage, be the attenuation control signal that voltage is controlled in the first default decay, it is maximum attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described first default decay.
15. alc circuits as described in as arbitrary in claim 11-13, it is characterized in that, described signal processing unit, also for controlling the voltage table of comparisons according to default power voltage and decay, before determining that voltage is controlled in the decay corresponding with the power voltage in described current sampling period, determine that the power voltage in described current sampling period is greater than default power voltage threshold value; And when the power voltage in described current sampling period is not more than described default power voltage threshold value, the decay control voltage of determining the described current sampling period is that voltage is controlled in the second default decay, and be the attenuation control signal that voltage is controlled in the described second default decay to described rf attenuation circuit output voltage, it is minimal attenuation parameter for controlling the attenuation parameter of described rf attenuation circuit that voltage is controlled in the described second default decay.
16. 1 kinds of frequency communication devices, is characterized in that, comprising:
Alc circuit as described in as arbitrary in claim 11-15.
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| CN201310469947.2A CN103546110B (en) | 2013-10-09 | 2013-10-09 | A kind of Attenuation control voltage determines method, device and alc circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107911091A (en) * | 2017-11-24 | 2018-04-13 | 京信通信系统（中国）有限公司 | The method and circuit of a kind of adjust gain |
| CN110572224A (en) * | 2019-08-22 | 2019-12-13 | 三维通信股份有限公司 | Method, device, system and readable storage medium for reducing base station receiving background noise |
| CN114415778A (en) * | 2022-01-14 | 2022-04-29 | 中国电子科技集团公司第十研究所 | Automatic debugging method for ALC loop parameters |
| CN116539952A (en) * | 2023-07-05 | 2023-08-04 | 北京中成康富科技股份有限公司 | Millimeter wave therapeutic apparatus power intelligent sampling method and system based on Internet of things |
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| CN101461135A (en) * | 2006-04-03 | 2009-06-17 | 高通股份有限公司 | Method and system for automatic gain control with intelligent selection of signal samples |
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| US5196806A (en) * | 1990-10-19 | 1993-03-23 | Nec Corporation | Output level control circuit for use in rf power amplifier |
| CN101461135A (en) * | 2006-04-03 | 2009-06-17 | 高通股份有限公司 | Method and system for automatic gain control with intelligent selection of signal samples |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107911091A (en) * | 2017-11-24 | 2018-04-13 | 京信通信系统（中国）有限公司 | The method and circuit of a kind of adjust gain |
| CN110572224A (en) * | 2019-08-22 | 2019-12-13 | 三维通信股份有限公司 | Method, device, system and readable storage medium for reducing base station receiving background noise |
| CN110572224B (en) * | 2019-08-22 | 2022-03-15 | 三维通信股份有限公司 | Method, device, system and readable storage medium for reducing base station receiving background noise |
| CN114415778A (en) * | 2022-01-14 | 2022-04-29 | 中国电子科技集团公司第十研究所 | Automatic debugging method for ALC loop parameters |
| CN114415778B (en) * | 2022-01-14 | 2023-06-27 | 中国电子科技集团公司第十研究所 | ALC loop parameter automatic debugging method |
| CN116539952A (en) * | 2023-07-05 | 2023-08-04 | 北京中成康富科技股份有限公司 | Millimeter wave therapeutic apparatus power intelligent sampling method and system based on Internet of things |
| CN116539952B (en) * | 2023-07-05 | 2023-09-26 | 北京中成康富科技股份有限公司 | Millimeter wave therapeutic apparatus power intelligent sampling method and system based on Internet of things |
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|---|---|
| CN103546110B (en) | 2016-08-17 |
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