CN102271424A - AFC (Automatic Frequency Control) device and method for multimode wireless terminal - Google Patents
AFC (Automatic Frequency Control) device and method for multimode wireless terminal Download PDFInfo
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- CN102271424A CN102271424A CN 201010621549 CN201010621549A CN102271424A CN 102271424 A CN102271424 A CN 102271424A CN 201010621549 CN201010621549 CN 201010621549 CN 201010621549 A CN201010621549 A CN 201010621549A CN 102271424 A CN102271424 A CN 102271424A
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Abstract
The invention provides an AFC (Automatic Frequency Control) device for a multimode wireless terminal. The device comprises an AFC_REG (Automatic Frequency Control Register), a D/A (digital to analog) module and an analog switch S1, wherein the AFC_REG is connected with a baseband module of each mode of a baseband chip of the wireless terminal through the analog switch S1 and is used for receiving an AFC voltage value from the baseband chip and storing the AFC voltage value; the D/A module is connected with the AFC_REG and is used for generating an offsetting voltage according to the AFC voltage value in the AFC_REG and outputting the offsetting voltage to a crystal oscillator; and the analog switch S1 is connected with the baseband chip and the AFC_REG and is used for selecting one baseband module of the baseband chip to switch on the AFC_REG. Meanwhile, the invention further provides a method for the AFC device to carry out AFC. With the adoption of the AFC device and the AFC method provided by the invention, the problems of frequency jittering and inaccurate clock frequency when the multimode wireless terminal is subjected to mode switching can be effectively avoided.
Description
Technical field
(be called for short, AFC) technology specially refers to a kind of multi-module radio terminal AFC control device and method to the present invention relates to the calibration of mobile communication system automatic frequency.
Background technology
In wireless terminal, all can produce the system works clock usually with crystal oscillator, use through modules such as the radio frequency that offers terminal behind the shaping amplification circuit and base band.All can there be certain frequency departure in all crystal oscillator output frequencies, and modules such as radio frequency and base band are relatively stricter to required system clock required precision, therefore the Clock Frequency Accuracy of crystal oscillator output need be controlled within certain scope, generally, wireless terminal all is that employing AFC technology realizes the control to the Clock Frequency Accuracy of crystal oscillator output, AFC control mainly is by adjusting the bias voltage of crystal oscillator, thereby the clock frequency of control crystal oscillator output provides the working clock frequency that meets the demands for modules such as base band and radio frequencies.
For example, (be called for short for Long Term Evolution, LTE) system, TD SDMA (is called for short, TD-SCDMA) system and gsm system wireless terminal, frequency deviation requires to be controlled in the 0.1ppm, promptly require to be controlled at for LTE terminal 2300MHz frequency range frequency deviation ± 230Hz in, require to be controlled at for TD-SCDMA terminal 2000MHz frequency range frequency deviation ± 200Hz in, require to be controlled at ± 190Hz for GSM terminal 1900 frequency range frequency deviations, require to be controlled at ± 180Hz for GSM terminal 1800 frequency range frequency deviations, require to be controlled at for GSM terminal 900 frequency range frequency deviations ± 90Hz in; When the clock frequency of crystal oscillator output exceeded the accuracy rating of system requirements, terminal will be adjusted the bias voltage of crystal oscillator by AFC control, and the clock frequency that crystal oscillator is exported is adapted in the acceptable scope.
Existing multimode terminal generally includes a multimode baseband chip and a plurality of radio frequency chip, or the structure of a plurality of baseband chip and a plurality of radio frequency chips, wherein, and the corresponding radio frequency chip of each pattern.Corresponding with it, prior art normally each pattern is used the complete AFC control circuit of a cover respectively, and the crystal oscillator to terminal carries out AFC control respectively, realizes the switching of different mode AFC control circuit to the crystal oscillator control by an analog switch.With the TD-SCDMA/GSM dual-mode terminal is example, and its AFC control circuit comprises as shown in Figure 1:
Two AFC control magnitude of voltage storage unit A FC_REG are connected with the TD-SCDMA baseband module or the GSM baseband module of multimode baseband chip respectively, receive TD-SCDMA pattern or GSM Mode A FC control magnitude of voltage and storage from baseband chip respectively;
Two D/A switch (being called for short D/A) module is connected with two AFC_REG respectively, and the AFC control magnitude of voltage of storing according to AFC_REG produces corresponding bias voltage and outputs to analog switch S2;
S2 is by the D/A module of multimode baseband chip control gating TD-SCDMA pattern or GSM pattern, the bias voltage of respective modules output outputed to crystal oscillator export satisfactory system clock with the control crystal oscillator.
In wireless terminal, described AFC_REG and D/A module are integrated in each radio frequency chip usually.
The AFC control method of prior art comprises:
Under the GSM pattern:
1, D/A module and the DCXO in multimode baseband chip control analog switch S1 and the S2 gating GSM radio frequency chip;
2, the baseband chip gsm module is according to frequency offset estimation result, calculate AFC control magnitude of voltage and send among the AFC_REG in the GSM radio frequency chip and store, D/A module in the GSM radio frequency chip produces bias voltage according to the AFC control magnitude of voltage of storing among the AFC_REG and outputs to crystal oscillator by analog switch S2, control crystal oscillator data adjustment output clock frequency is for GSM radio frequency chip and baseband chip provide satisfactory system clock frequency;
3, D/A module in multimode baseband chip control analog switch S1 and the S2 gating TD-SCDMA radio frequency chip and digitally controlled crystal oscillator (are called for short, DCXO) when emergence pattern switches;
4, baseband chip TD-SCDMA module is according to frequency offset estimation result, calculate AFC control magnitude of voltage and send among the AFC_REG in the TD-SCDMA radio frequency chip and store, D/A module in the TD-SCDMA radio frequency chip produces bias voltage according to the AFC control magnitude of voltage of storing among the AFC_REG and outputs to crystal oscillator by analog switch S2, control crystal oscillator data adjustment output clock frequency is for TD-SCDMA radio frequency chip and baseband chip provide satisfactory system clock frequency.
Control mode under the TD-SCDMA pattern is similar to the control mode under the GSM pattern.
There are following problem in the above-mentioned AFC control device and the control method of prior art:
1, when emergence pattern switches when the radio frequency chip of switching target pattern is not also finished normal startup, the voltage of its D/A module output is a unknown voltage, if analog switch directly switches to target pattern with AFC control, can cause offering the bias voltage generation saltus step in a big way of crystal oscillator, thereby produce bigger frequency deviation.
2, after mode switch, the bias voltage that offers crystal oscillator is that the AFC control magnitude of voltage of storing among the AFC_REG according to the switching target pattern is provided with, and the offset frequency situation and the current actual frequency deviations situation of this AFC control magnitude of voltage reflection have usually than big-difference, thereby cause the clock frequency of crystal oscillator output inaccurate.
Summary of the invention
In view of this, the invention provides a kind of multi-module radio terminal AFC control device and method, with the problem that can produce big frequency deviation when the mode switch that solves that prior art exists.
Technical scheme of the present invention is that a kind of multi-module radio terminal AFC control device comprises:
An AFC control magnitude of voltage storage unit A FC_REG is connected with the baseband module of each pattern of wireless terminal baseband chip by analog switch S1; Receive AFC control magnitude of voltage and storage from the wireless terminal baseband chip;
A D/A module is connected with described AFC_REG, produces bigoted voltage according to the AFC control magnitude of voltage of storing among the AFC_REG and outputs to crystal oscillator;
Analog switch S1 is connected with described multimode baseband chip and AFC_REG, selects a baseband module of described multimode baseband chip to connect described AFC_REG under described multimode baseband chip control.
The present invention also provides a kind of multi-module radio terminal AFC control method, comprising:
The baseband chip control analog switch S1 of step 1, multi-module radio terminal connects the baseband module and the AFC control magnitude of voltage storage unit A FC_REG of work at present pattern;
Step 2, described baseband chip calculate and are provided with the needed AFC control of multi-module radio terminal magnitude of voltage;
Step 3, D/A module produce bias voltage according to the AFC control magnitude of voltage of storing among the described AFC_REG and output to described crystal oscillator;
When step 4, emergence pattern are switched, described baseband chip control analog switch S1 will switch to the baseband module of mode of operation after the mode switch with the baseband module that AFC_REG connects; Execution in step 2.
Multi-module radio terminal AFC control device of the present invention and method adopt an AFC_REG and D/A module to realize control to the crystal oscillator bias voltage, in the process of carrying out mode switch, the bias voltage of crystal oscillator remains at the bias voltage that switches under the premode, content in AFC_REG changes, owing to the uncertain frequency jitter that brings of the D/A module output voltage of switching target pattern, also avoided in the time of can effectively avoiding switching because the inaccurate problem of clock frequency that the difference of offset frequency situation that reflects among the AFC_REG of switching target pattern and current actual frequency deviations situation is brought.Simultaneously, device of the present invention is compared with one type of prior art syringe, has reduced at least one AFC_REG and at least one D/A module, has effectively reduced the cost of multi-module radio terminal.
Description of drawings
Fig. 1 is a prior art TD-SCDMA/GSM wireless terminal with double mode AFC control circuit structure chart
Fig. 2 is an AFC control device structure chart of the present invention
Fig. 3 is the specific embodiment of the invention 1 a wireless terminal with double mode AFC control circuit structure chart
Fig. 4 is the specific embodiment of the invention 2 three mould wireless terminal AFC control circuit structure charts
Fig. 5 is the specific embodiment of the invention 3 wireless terminal with double mode AFC control method flow charts
Embodiment
For further specifying technical scheme of the present invention, provide specific embodiment below and be described with reference to the accompanying drawings.
Specific embodiment 1
Present embodiment is the concrete application of multi-module radio terminal AFC control device of the present invention in the TD-SCDMA/GSM wireless terminal with double mode, and present embodiment AFC control circuit structure as shown in Figure 3.
The wireless terminal with double mode AFC control device of present embodiment comprises:
AFC control magnitude of voltage storage unit A FC_REG is connected with the GSM baseband module with the TD-SCDMA baseband module of wireless terminal baseband chip by multiway analog switch S1; Receive AFC control magnitude of voltage and storage from the wireless terminal baseband chip.
In the present embodiment, described AFC_REG is integrated in the GSM radio frequency chip; Under the TD-SCDMA mode of operation, from the TD-SCDMA baseband module reception AFC control magnitude of voltage of wireless terminal baseband chip; Under the GSM mode of operation, from the GSM baseband module reception AFC control magnitude of voltage of wireless terminal baseband chip;
Described can be serial ports, parallel port or spi bus by multiway analog switch S1 with the connected mode that the TD-SCDMA baseband module of wireless terminal baseband chip is connected with the GSM baseband module, and the connected mode in the present embodiment is that spi bus connects;
Multiway analog switch S1, be connected with the baseband chip and the AFC_REG of described wireless terminal with double mode respectively, under described wireless terminal with double mode baseband chip control, the GSM baseband module or the TD-SCDMA baseband module of described AFC_REG and described wireless terminal with double mode baseband chip connected;
The D/A module is connected with described AFC_REG, produces bias voltage according to the AFC control magnitude of voltage of storing among the AFC_REG and outputs to crystal oscillator;
In the present embodiment, described D/A module is integrated in the GSM radio frequency chip.
Specific embodiment 2
Present embodiment is the concrete application of multi-module radio terminal AFC control device of the present invention in LTE/TD-SCDMA/GSM three mould wireless terminals, and present embodiment AFC control circuit structure as shown in Figure 4.
Three mould wireless terminal AFC control device of present embodiment comprise:
AFC control magnitude of voltage storage unit A FC_REG is connected with LTE baseband module, TD-SCDMA baseband module and the GSM baseband module of wireless terminal baseband chip by multiway analog switch S1; Receive AFC control magnitude of voltage and storage from the wireless terminal baseband chip.
In the present embodiment, described AFC_REG is under the LTE mode of operation, from the LTE baseband module reception AFC control magnitude of voltage of wireless terminal baseband chip; Under the TD-SCDMA mode of operation, from the TD-SCDMA baseband module reception AFC control magnitude of voltage of wireless terminal baseband chip; Under the GSM mode of operation, from the GSM baseband module reception AFC control magnitude of voltage of wireless terminal baseband chip;
Described can be serial ports, parallel port or spi bus by multiway analog switch S1 with the connected mode that LTE baseband module, TD-SCDMA baseband module and the GSM baseband module of wireless terminal baseband chip are connected, and the connected mode in the present embodiment is that the parallel port connects;
Multiway analog switch S1, be connected with the baseband chip and the AFC_REG of described three mould wireless terminals respectively, under the control of described three mould wireless terminal baseband chips with LTE baseband module or the GSM baseband module or the connection of TD-SCDMA baseband module of described AFC_REG and described three mould wireless terminal baseband chips;
The D/A module is connected with described AFC_REG, produces bigoted voltage according to control information stored among the AFC_REG and outputs to crystal oscillator.
Specific embodiment 3
Present embodiment is the concrete application in the multi-module radio terminal AFC control method multimode terminal of the present invention, and present embodiment AFC control method flow process as shown in Figure 5.
1, wireless terminal starting selects a network schemer as the work at present pattern;
2, baseband chip control analog switch S1 connects work at present pattern baseband module and described AFC control magnitude of voltage storage unit A FC_REG;
3, baseband chip calculates and is provided with the needed AFC control of multi-module radio terminal magnitude of voltage;
301, the baseband module with the AFC_REG connection calculates needed AFC control magnitude of voltage according to frequency offset estimating;
302, the AFC control magnitude of voltage of storing among the baseband module retaking of a year or grade AFC_REG that connects with AFC_REG;
303, judge that the AFC that calculates controls the AFC control magnitude of voltage whether magnitude of voltage equals to store among the AFC_REG, if equate execution in step 4, otherwise execution in step 304;
304, the baseband module of connecting with AFC_REG sends the AFC control magnitude of voltage that calculates to described AFC_REG storage;
4, the D/A module produces bias voltage according to the AFC control magnitude of voltage of storing among the described AFC_REG and outputs to described crystal oscillator;
5, judge whether that emergence pattern switches; If execution in step 6, otherwise execution in step 3;
6, S1 will switch to the baseband module of the mode of operation after the switching with the baseband module that AFC_REG connects; Execution in step 3.
One of ordinary skill in the art obviously should be known and be understood, the inventive method for above embodiment only be used to illustrate the inventive method, and be not limited to the inventive method.Though effectively described the present invention by embodiment, also there are many variations in the present invention and do not break away from spirit of the present invention.For example, apparatus and method of the present invention also can be used for the AFC control of the multi-module radio terminal of other various patterns, as comprise the multi-module radio terminal of WCDMA, CDMA, CDMA2000 isotype; Without departing from the spirit and substance of the case in the method for the present invention, those skilled in the art work as can make various corresponding changes or distortion according to the inventive method, but these corresponding changes or distortion all belong to the claim protection range of the inventive method.
Claims (7)
1. a multi-module radio terminal AFC control device is characterized in that, comprising:
An automatic frequency calibration AFC control magnitude of voltage storage unit A FC_REG is connected with the baseband module of each pattern of wireless terminal baseband chip by analog switch S1; Receive AFC control magnitude of voltage and storage from the wireless terminal baseband chip;
A D/A switch D/A module is connected with described AFC_REG, produces bigoted voltage according to the AFC control magnitude of voltage of storing among the AFC_REG and outputs to crystal oscillator;
Analog switch S1 is connected with described multimode baseband chip and AFC_REG, selects a baseband module of described multimode baseband chip to connect described AFC_REG under described multimode baseband chip control.
2. a kind of multi-module radio terminal AFC control device according to claim 1 is characterized in that:
Described is spi bus by analog switch S1 with the connected mode that the baseband module of each pattern of wireless terminal baseband chip is connected.
3. a kind of multi-module radio terminal AFC control device according to claim 1 is characterized in that:
Described is serial data line by analog switch S1 with the connected mode that the baseband module of each pattern of wireless terminal baseband chip is connected.
4. a kind of multi-module radio terminal AFC control device according to claim 1 is characterized in that:
Described is parallel data line by analog switch S1 with the connected mode that the baseband module of each pattern of wireless terminal baseband chip is connected.
5. according to each described a kind of multi-module radio terminal AFC control device in the claim 1～4, it is characterized in that:
Described AFC_REG and described D/A module are integrated in the radio frequency chip of described multi-module radio terminal.
6. a multi-module radio terminal AFC control method is characterized in that, comprising:
The baseband chip control analog switch S1 of step 1, multi-module radio terminal connects the baseband module and the automatic frequency calibration AFC control magnitude of voltage storage unit A FC_REG of work at present pattern;
Step 2, described baseband chip calculate and are provided with the needed AFC control of multi-module radio terminal magnitude of voltage;
Step 3, D/A switch D/A module produce bias voltage according to the AFC control magnitude of voltage of storing among the described AFC_REG and output to described crystal oscillator;
When step 4, emergence pattern are switched, described baseband chip control analog switch S1 will switch to the baseband module of mode of operation after the mode switch with the baseband module that AFC_REG connects; Execution in step 2.
7. a kind of multi-module radio terminal AFC control method according to claim 6 is characterized in that described step 2 further comprises:
The baseband module of connecting with AFC_REG in the described baseband chip calculates needed AFC control magnitude of voltage according to frequency offset estimating;
The AFC control magnitude of voltage of storing among the baseband module retaking of a year or grade AFC_REG that described and AFC_REG connect;
If the AFC that calculates control magnitude of voltage is not equal to the AFC control magnitude of voltage of storing among the AFC_REG, the AFC control magnitude of voltage that described baseband module transmission of connecting with AFC_REG calculates is to described AFC_REG storage.
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| CN 201010621549 CN102271424B (en) | 2010-12-31 | 2010-12-31 | AFC (Automatic Frequency Control) device and method for multimode wireless terminal |
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| CN 201010621549 CN102271424B (en) | 2010-12-31 | 2010-12-31 | AFC (Automatic Frequency Control) device and method for multimode wireless terminal |
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| CN102271424B CN102271424B (en) | 2012-08-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103067907A (en) * | 2012-12-20 | 2013-04-24 | 中兴通讯股份有限公司 | Multi-mode terminals and switching method of multi-mode terminals |
| WO2016165271A1 (en) * | 2015-04-14 | 2016-10-20 | 深圳市中兴微电子技术有限公司 | Multi-mode terminal and automatic frequency control switching method thereof, and computer storage medium |
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| CN1848704A (en) * | 2005-04-15 | 2006-10-18 | 展讯通信（上海）有限公司 | Cell searching method and apparatus in WCDMA system |
| CN1909386A (en) * | 2005-08-05 | 2007-02-07 | 上海明波通信技术有限公司 | Device and method for realizing frequency switch and automatic control of multiple-module mobile communication terminal |
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| WO2006099532A2 (en) * | 2005-03-11 | 2006-09-21 | Qualcomm Incorporated | Automatic frequency control for a wireless communication system with multiple subcarriers |
| CN1848704A (en) * | 2005-04-15 | 2006-10-18 | 展讯通信（上海）有限公司 | Cell searching method and apparatus in WCDMA system |
| CN1909386A (en) * | 2005-08-05 | 2007-02-07 | 上海明波通信技术有限公司 | Device and method for realizing frequency switch and automatic control of multiple-module mobile communication terminal |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103067907A (en) * | 2012-12-20 | 2013-04-24 | 中兴通讯股份有限公司 | Multi-mode terminals and switching method of multi-mode terminals |
| WO2013189397A3 (en) * | 2012-12-20 | 2014-02-13 | 中兴通讯股份有限公司 | Multi-mode terminal and handover method for multi-mode terminal |
| US9867231B2 (en) | 2012-12-20 | 2018-01-09 | Zte Corporation | Multi-mode terminal and handover method for multi-mode terminal |
| CN103067907B (en) * | 2012-12-20 | 2018-05-18 | 中兴通讯股份有限公司 | A kind of switching method of multimode terminal and multimode terminal |
| WO2016165271A1 (en) * | 2015-04-14 | 2016-10-20 | 深圳市中兴微电子技术有限公司 | Multi-mode terminal and automatic frequency control switching method thereof, and computer storage medium |
| CN106155178A (en) * | 2015-04-14 | 2016-11-23 | 深圳市中兴微电子技术有限公司 | A kind of multimode terminal and automatic frequency thereof control changing method |
| CN106155178B (en) * | 2015-04-14 | 2019-05-31 | 深圳市中兴微电子技术有限公司 | A kind of multimode terminal and its automatic frequency control switching method |
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| CN102271424B (en) | 2012-08-29 |
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