CN101303403B - Multi-mode satellite navigation receiving radio frequency front end chip - Google Patents
Multi-mode satellite navigation receiving radio frequency front end chip Download PDFInfo
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- CN101303403B CN101303403B CN2007100694084A CN200710069408A CN101303403B CN 101303403 B CN101303403 B CN 101303403B CN 2007100694084 A CN2007100694084 A CN 2007100694084A CN 200710069408 A CN200710069408 A CN 200710069408A CN 101303403 B CN101303403 B CN 101303403B
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Abstract
The invention provides a framing method of the receiver front-end of multimode satellite navigation, which discloses a frontend chip of the receiving RF of multimode satellite navigation which is applicable to a plurality of satellite navigation systems. The method of the invention comprises six modules which are a multimode PF frontend low-noise amplifier/ mixer group of monolithic integrated and completed type, a reconfigurable image rejection filter, a band-variable gain amplifier, an analog-to-digital converser, a configurable frequency synthesizer and a multimode control logic module. The reconfigurable module can realize the distribution of functional parameters according to the requirement through the multimode control logic management, causing the working performance to be optimized and meeting the functional requirement on the RF front end of the receiving platform of multimode satellite navigation. The framing method of the invention requires no external supporting accessories and has the advantages of being easy to carrying out cascade connection with preceding and backward stages, high gain, small noise coefficient and good integration. The invention is applied to the current communication and navigation positioning equipment for receiving multimode satellite navigation signals, has a wide application range and quite remarkable economic benefit, is largely on demand, supports the integration making use of multimode satellite navigation positioning information, improves positioning precision and has large social benefit.
Description
Technical field
The invention belongs to the wireless communication electronics technical field, relate to a kind of radio frequency front end chip that satellite navigation signals receives that is used for, particularly relate to multi-mode satellite navigation receiving radio frequency front end chip applicable to multiple satellite navigation system.
Background technology
The global navigation satellite positioning system of moving in the world mainly contains two big systems: the one, and GPS of USA system, the 2nd, Muscovite GNONASS system.Europe has also proposed to have the Galileo global positioning satellite plan of own characteristic.And China is also building the global position system of oneself.Thereby, the situation that following Global Positioning System (GPS) a multisystem will occur and deposit.Along with the fast development of infotech and the continuous growth of information requirement, the user presses for the resource of utilizing a plurality of satellite navigation systems, adopt the mode of information fusion, effectively improve bearing accuracy, so can support the receiver of two above satellite systems to become a kind of trend future.
As a kind of integrated level height, cheap, the receiver scheme of function admirable, the receiver of full chip has irreplaceable advantage.Demand for supporting multisystem is reflected in chip solution, requires the receiver radio frequency front-end chip to finish reception and processing capacity to the multi-mode satellite navigation positioning system signal.But, present most of satellite navigation system all is based on single satellite navigation system, do not have the ability that support receives a plurality of satellite navigation system signals simultaneously, based on the front-end chip of single satellite navigation system to the reception of other pattern satellite navigation and location system signals with handle and do not have compatibility.
Shown in Figure 1 is the basic module framework of traditional satellite navigation receiving front-end chip, the input signal of traditional structure must transmit through active antenna, also need to adopt low noise amplifier and radio-frequency filter outside the sheet, the outer radio-frequency filter of sheet adopts passive LC structure usually, its structure not only designs and debugs complexity, and is difficult to realize that the front end to the multi-satellite navigation signal receives and handles.The conventional front-end chip adopts in the sheet and the complicated architectures of the outer module of sheet, and the entire front end size of devices is big, power consumption is big, thereby directly limits it and be applied to modern communications and navigation field product.
Summary of the invention
The objective of the invention is to overcome the problem that present location navigation radio frequency front end chip exists, propose a kind of new architecting method, disclose the formation of the multi-mode satellite navigation receiving front-end chip of a kind of multiple satellite navigation system signals reception of support of novel Low Medium Frequency and broadband, low-power consumption, function optimization.Above-mentioned purpose of the present invention is to realize by following technical scheme: multi-mode satellite navigation receiving front-end chip, and the architecting method of its Low Medium Frequency, multi-mode satellite navigation receiving front-end comprises:
(1) the receiving front-end input end directly connects antenna, and the satellite-signal that antenna is received directly enters chip; Can receive multiple different satellite navigation system signals, need not to connect active antenna.
(2) input stage adopts the combination of one or more low noise amplifier/frequency mixer; Reception has the satellite navigation signals of same frequency band, and is identical or be more or less the same because of its rf frequency parameter, then can use the combination of same low noise amplifier/frequency mixer; Reception is in the satellite-signal of different frequency bands, according to number of frequency bands, then needs the combination of two or more low noise amplifier/frequency mixer, to adapt to the broad frequency range that receives multi-mode, different frequency bands satellite navigation signals; The different antenna that is connected of two or more low noise amplifier/frequency mixer, the low noise of finishing the different frequency bands satellite navigation signals automatically amplifies; Require low noise amplifier to have good high-gain and low-noise performance simultaneously.
(3) the dynamic reconfigurable image-reject filter of adjusting of frequency parameter of configuration; The centre frequency of this reconfigurable image-reject filter and bandwidth can be passed through steering logic, in predefined variable range, realize reconfiguring of frequency parameter, satisfy the bandpass filtering of reception multi-mode satellite navigation signal and the needs that mirror carrier frequencies suppresses, the mirror image of realizing various bandwidth suppresses filtering, and need not outside chip, to connect the intermediate-frequency filter device, make all modules of receiving front-end be integrated in monolithic chip.
(4) a configurable frequency synthesizer is set, has the configurable characteristic of frequency synthesis, can adapt to the demand of different satellite navigation system signals, the local oscillation signal of required one or more groups of different down coversion is provided.
(5) a variable bandwidth gain amplifier is set, its bandwidth covers the maximum frequency range of the intermediate-freuqncy signal after the satellite navigation signals down coversion of required reception, and the input dynamic range of bigger gain and broad is provided.
(6) analog to digital converter of configuration, the digital signal of its output is delivered to the follow-up baseband processing chip of receiving front-end.
(7) a multi-mode control logic module is set, receives the satellite navigation system selection signal that base band is sent, convert configuration steering logic signal to above-mentioned low noise amplifier/bank of mixers, image-reject filter and frequency synthesizer.
Multi-mode satellite navigation receiving front-end chip is a single-chip, adopt the receiver architecture of Low Medium Frequency, it is integrated with low noise amplifier/bank of mixers 301, the reconfigurable image-reject filter 302 of frequency parameter, variable bandwidth gain amplifier 303, analog to digital converter 304, configurable frequency synthesizer 305 and 306 6 modules of multi-mode steering logic.The satellite-signal that antenna receives directly enters chip, according to different satellite navigation systems, select the combination of the low noise amplifier/frequency mixer of corresponding performance optimization, select corresponding local frequency simultaneously, amplify to the received signal and down coversion.The analog intermediate frequency signal that different satellite-signals obtain by mixing, centre frequency and bandwidth may be different.By image-reject filter is configured, can obtain the wave filter of required centre frequency and bandwidth.Analog intermediate frequency signal again by analog to digital conversion, obtains being suitable for the digitizing intermediate-freuqncy signal of subsequent treatment after suppressing filtering and variable gain amplifier amplification through mirror image.
Described one group of low noise amplifier/frequency mixer 301, it has one or more input ends to connect antenna, can be the combination of one or more low noise amplifier/frequency mixer.There are one or more input ends to connect the local oscillation signal end of frequency mixer, have the output terminal of one or more high-gains, noiselike signal to connect the configurable image-reject filter 302 of frequency parameter.For the satellite navigation system with same frequency band, the rf frequency parameter is identical or be more or less the same, and then can use the combination of a low noise amplifier/frequency mixer.Receive the satellite-signal that is in different frequency bands if desired, according to number of frequency bands, then need the combination of two or more low noise amplifier/frequency mixer, to be applicable to different frequency band ranges.
The fusion structure that is combined as high-gain and low noise low noise amplifier and frequency mixer of low noise amplifier/frequency mixer, consider the characteristic coupling between the two more fully, can obtain global index preferably, and be easy to cascade with the front and back level, reduce the cost of area and power consumption, improve integrated level.
The configurable image-reject filter 302 of described frequency parameter, it has an input end to connect one group of low noise amplifier/frequency mixer 301, has an output terminal to connect variable bandwidth gain amplifier 303.The frequency parameter of configurable image-reject filter is controlled by the chip controls logic manage, changes in predefined scope.
Described variable bandwidth gain amplifier 303, it has an input end to connect configurable image-reject filter 302, and an output terminal connection mode number converter 304 is arranged; Its bandwidth cover after the satellite navigation signals down coversion of required reception the maximum frequency range of intermediate-freuqncy signal, and provide the input dynamic range of bigger gain and broad.
Described analog to digital converter module 304, it has an input end to connect variable bandwidth gain amplifier 303, has an output terminal to connect the follow-up baseband processing chip of front-end chip, and it also is the output terminal of multi-mode satellite navigation receiving front-end chip 211.
Described configurable frequency synthesizer 305 according to the demand of different satellite navigation systems, provides the different required local oscillation signals of down coversion.This local oscillation signal can one group or many groups, has one or more local oscillation signal output terminals to connect the local oscillation signal end of low noise amplifier/bank of mixers 301 frequency mixer respectively.Configurable frequency synthesizer 305 can be selected a suitable output local frequency according to the frequency of operation section of different satellite navigation systems, under this local frequency, and the intermediate-freuqncy signal of a proper centre frequency of low noise amplifier/frequency mixer 301 outputs.
The chip controls logic is provided with image-reject filter 302, disposes suitable centre frequency and bandwidth parameter, suppresses the requirement of filtering to be applicable to the intermediate frequency mirror image after the different satellite navigation system signals down-converted.
Described multi-mode steering logic unit 306, a plurality of output terminals are arranged, be connected respectively to the pattern control end of noise amplifier/bank of mixers (301), image-reject filter (302) and frequency synthesizer (305), it also has an input end, a control output end that connects follow-up chip, receive the satellite navigation system selection signal that base band is sent, convert configuration steering logic signal to above-mentioned low noise amplifier/bank of mixers, image-reject filter and frequency synthesizer.
Described configurable frequency synthesizer 305 for be controlled by the chip controls logic manage, the output local frequency can select a suitable local frequency according to the frequency of operation section of different satellite navigation systems, make through the intermediate frequency center frequency duty optimum after the down-converted.
A plurality of steering logics in the configurable module of the parameter of described front-end chip are one or more change-over switch combinations.Front-end chip can receive N pattern satellite navigation system signals simultaneously, and the span of N is 2～5, and preferential span is 2～3, as portable radiotelephone communication and navigator fix equipment with 2～3 pattern star derivatives according to fusion, can obtain sufficiently high bearing accuracy.
Steering logic change-over switch in the configurable module of the parameter of described chip can be that individual module is controlled, also can constitute combination control to a plurality of modules by the change-over switch of a plurality of steering logics, the performance that makes it to be operated in the multi-mode satellite navigation receiving system is suitable and optimization.
Described multi-mode satellite navigation receiving front-end chip, can receive a kind of pattern satellite navigation system signals, or when receiving satellite navigation system signals more than a kind of pattern, the control of control logic module is switched with logic switch or is selected the superior with time division multiplex and the output of many signals, is controlled in real time by the base-band software control signal of forward end chip feedback.
Described front-end chip is the highly integrated chip that a slice realizes based on CMOS technology.
Substantial effect of the present invention is:
(1) by selecting the combination of different front end low noise amplifier/frequency mixer, and the frequency of change local oscillator, the frequency parameter of while configuration mirroring suppression filter, realize that multiple satellite navigation system signals receives, the functional requirement of multi-mode satellite navigation receiving platform to radio-frequency front-end satisfied in support multi-mode satellite navigation location, and for supporting the multi-mode satellite navigation location, by the information fusion of various satellite navigation systems, improving bearing accuracy provides the receiving front-end condition.
(2) conversion of satellite navigation signals receiving mode is that the multi-mode steering logic of chip is finished.System's run duration, the multi-mode steering logic is selected signal according to the satellite navigation system that baseband chip sends, and low noise amplifier/bank of mixers, reconfigurable image-reject filter and configurable frequency synthesizer are reconfigured.Institute's employing method is finished by base-band software control in real time, that the multi-mode conversion has is quick in real time, intelligence flexibly, realize characteristics easily.
(3) the integrated low noise amplifier/bank of mixers of chip directly connects antenna, need not with the outer supporting attachment of chips such as active antenna and radio-frequency filter, is easy to cascade, high, the good remarkable advantage of the little integration of noise figure of gain but have with the front and back level.
(4) integrated bandwidth and the reconfigurable image-reject filter of centre frequency of chip, present band-pass filtering property for useful signal, to being with outer interference and image signal to play inhibiting effect, the mirror image of realizing various bandwidth suppresses filtering, and need not outside chip, to connect the intermediate-frequency filter device, all modules of receiving front-end are integrated on the single-chip, had both simplified formation, reduced size again.
(5) front-end chip of the present invention is to realize that fully chip integration height, production cost are easy to effective control based on CMOS technology.
(6) the present invention can be applicable to have the receiving equipments such as vehicle-mounted and mobile phone of multimodal satellite navigation signal receiving function, and it is very big to promote the field demand, and economic benefit is very remarkable.
Description of drawings
Fig. 1 conventional satellite navigation neceiver structure of radio-frequency front end theory diagram.
Fig. 2 adopts the basic composition theory diagram of the satellite navigation receiving system that the present invention realizes.
The basic building block of Fig. 3 multi-mode satellite navigation receiving front-end of the present invention chip embodiment is formed synoptic diagram.
Dual system receiving front-end first embodiment that Fig. 4 the present invention realizes constitutes block diagram.
Dual system receiving front-end second embodiment that Fig. 5 the present invention realizes constitutes block diagram.
Among Fig. 3: 301-low noise amplifier/bank of mixers; The reconfigurable image-reject filter of 302-frequency parameter; 303-variable bandwidth gain amplifier; The 304-digital to analog converter; The configurable frequency synthesizer of 305-; 306-multi-mode control logic module; 311,312,31n-is the combination of low noise amplifier/frequency mixer.
Among Fig. 4: 401-low noise amplifier/bank of mixers; The configurable frequency synthesizer of 405-; The soft switch of S01, S02-; P01-P02, P03-P04-signal receive path.
Among Fig. 5: 501-low noise amplifier/bank of mixers; The configurable frequency synthesizer of 505-; P11-P12, P13-P14-signal receive path.
Embodiment:
Below by embodiment, and in conjunction with the accompanying drawings, this present invention's technical scheme is described in further detail.
Employing shown in Fig. 2 basic composition theory diagram multimodal satellite navigation receiving system of the present invention.It comprises multimode radio-frequency front end chip 201, Base-Band Processing SoC chip 202 and antenna 203.Multimode radio-frequency front end chip 201 input ends directly connect antenna 203, and its output terminal connects the input end of Base-Band Processing SoC chip 202; The multi-mode satellite navigation signal that antenna 203 receives is delivered to the input end of multimode radio-frequency front end 201; The control end of radio frequency front end chip 201 is received the satellite navigation system of baseband chip 202 and is selected signal end.Multi-mode satellite navigation radio frequency front end chip 201 directly receives from the radiofrequency signal of antenna 203 outputs, finishes radio frequency low-noise amplification, down coversion, intermediate frequency filtering and amplification in 201, and last analog to digital conversion becomes digital signal and outputs to baseband chip 202.Baseband chip 202 is finished functions such as digital demodulation, positioning signal extraction, and according to system-level requirement, sends satellite navigation system to radio frequency front end chip 201 and select signal.Radio frequency front end chip 201 receives satellite navigation system and selects signal, converts to the selection of configuration signal with reconfigurable functional circuit in the front-end chip through inner multi-mode steering logic.
The basic building block of multi-mode satellite navigation receiving front-end chip embodiment of the present invention is formed as shown in Figure 3, multi-mode satellite navigation receiving front-end chip 211 comprises 6 modules: low noise amplifier/bank of mixers 301, reconfigurable image-reject filter 302, variable bandwidth gain amplifier 303, analog to digital converter 304, configurable frequency synthesizer 305 and multi-mode steering logic 306.The input end of low noise amplifier/bank of mixers 301 connects antenna, its output terminal is connected on the input end of reconfigurable image-reject filter 302,302 output terminal connects variable bandwidth gain amplifier 303 input ends, the input end of 303 output terminal connection mode number converter 304,304 output terminal also is the output terminal of multi-mode satellite navigation receiving front-end chip 211, and the local oscillation signal output terminal of configurable frequency synthesizer 305 is added to the local oscillation signal end of low noise amplifier/bank of mixers 301 frequency mixer.Multi-mode steering logic 306 input ends insert satellite navigation system and select signal, and its output control signal is added to the selection control end of low noise amplifier/bank of mixers 301, reconfigurable image-reject filter 302 and configurable frequency synthesizer 305 respectively.
Wherein low noise amplifier/bank of mixers 301, and image-reject filter 302 and frequency synthesizer 305 all are the unit module that can reconfigure their circuit function parameters separately respectively by steering logic.
Low noise amplifier/bank of mixers 301 shown in Fig. 3 comprises 301
1, 301
2... 301
nThe combination of N low noise amplifier/frequency mixer is arranged.301
1, 301
2... 301
nThe optimum working frequency range of the combination of each low noise amplifier/frequency mixer can be inequality.The span of described N is 2～5, and preferential span is 2～3.The multi-mode steering logic 306 of chip is exported one group of logic control signal, controls the gating of the combination of each low noise amplifier/frequency mixer.Combination at the low noise amplifier/frequency mixer of current frequency band work optimum can be linked into signal path by steering logic, make its input receive antenna, reconfigurable image-reject filter 302 is received in output, satisfies the demand that the multi-mode satellite navigation signal works in a plurality of different frequency ranges.The present invention adopts low noise amplifier and the frequency mixer that merges design, more take into full account low noise amplifier and the frequency mixer characteristic coupling between the two, can obtain preferable performance, as noise figure, gain and power consumption etc., be easy to cascade with the front and back level, and can reduce chip area and reduce power consumption, help improving the integrated level of chip.
The reconfigurable image-reject filter 302 of frequency parameter has the inhibit feature of good image frequency signal, and simultaneously, its frequency parameter can be adjusted by the multi-mode steering logic.For the signal frequency and the bandwidth of different satellite navigation systems, centre frequency and the bandwidth of making to obtain after the down-converted intermediate-freuqncy signal through the local oscillator mixing are also different.The steering logic of chip is exported the centre frequency that one group of control signal disposes wave filter, exports the bandwidth of another group control signal configuration wave filter.By steering logic the centre frequency of image-reject filter 302 and the frequency parameter of bandwidth are adjusted, be configured to be applicable to the intermediate frequency image-reject filter of different satellite navigation systems, satisfy the formation needs of multi-mode front end.
Variable bandwidth gain amplifier 303 provides the bigger gain and the input dynamic range of broad.Because the different satellite navigation system intermediate-freuqncy signal centre frequencies of required reception and the otherness of bandwidth, the bandwidth of amplifier should cover the frequency range of all intermediate-freuqncy signals, to guarantee in all cases the linear amplification to intermediate-freuqncy signal.
The signal that the satellite navigation system that multi-mode steering logic 306 reception baseband chips send is selected converts the steering logic signal to above-mentioned low noise amplifier/bank of mixers 301, image-reject filter 302 and frequency synthesizer 305 to.According to different satellite navigation systems, select the image-reject filter of combination, local frequency and the appropriate frequency parameter of preferred low noise amplifier/frequency mixer by the multi-mode steering logic, realize reception to multiple satellite navigation signals.
Shown in Figure 4 is first embodiment of the compatible two kinds of satellite navigation systems of multi-mode satellite navigation receiving radio frequency front end chip of the present invention.It has two signal paths: the P01-P02 signal path is the signal reception path that chip receives gps system L1 frequency band signals, and P03-P04 is the signal reception path that chip receives Galileo satellite navigation system E5 frequency band signals.Chip multi-mode steering logic 406 is exported a control signal, and the soft handover of gauge tap S01 and S02 is realized the selection of P01-P02 and P03-P04 signal path.Steering logic 406 is exported the local oscillation signal frequency of a control signal configuration frequency synthesizer 405 outputs, exports the centre frequency of a control signal configuration mirroring suppression filter 402, output another one control signal configuration wave filter 402 bandwidth.
When the system front end chip when antenna receives gps system L1 frequency band signals, P01-P02 path gating is effective under steering logic control, 4011 input end signal frequencies are 1575.42MHz, the local frequency that steering logic 406 selects frequency synthesizer 405 to produce is LO1, obtaining the intermediate-freuqncy signal centre frequency after the two mixing is IF1, and bandwidth is 2.046MHz.Under steering logic 406 controls, the frequency parameter of image-reject filter 402 is configured to centre frequency IF1, and bandwidth BW 1 is 2.046MHz.When the front end chip when antenna receives Galileo satellite navigation system E5 frequency band signals, under steering logic control, P03-P04 path gating is effective, 4012 input end signal frequencies are 1207.14MHz, the local frequency that frequency synthesizer 405 produces is LO2, obtaining the intermediate-freuqncy signal centre frequency after the two mixing is IF2, and bandwidth is 20.46MHz.Steering logic is configured to centre frequency IF2 with the frequency parameter of image-reject filter 302, and bandwidth BW 2 is 20.46MHz.Export after the output signal process intermediate frequency amplification of image-reject filter 402 and the analog to digital conversion.
Two paths of above-mentioned P01-P02 and P03-P04 are selected effectively by the multi-mode steering logic.During practical application, allow wherein certain passage is effective, front-end chip is operated in the monotype state.Also can adopt time-sharing format, make two passage time-sharing works, on a front-end chip, allow the compatible work of two different satellite navigation systems at the multi-mode state, thereby, realized the Bridging function of multi-mode satellite navigation receiving front-end.
Another embodiment of the compatible two kinds of systems of multi-mode satellite navigation receiving radio frequency front end chip of the present invention shown in Figure 5.P11-P12 is the signal path that chip receives gps system L1 frequency band signals, and P13-P14 is the signal path that chip receives the Galileo L1 of system frequency band signals, and P11-P12 and P13-P14 signal path are selected effectively by the multi-mode steering logic 506 of chip.Because the frequency range of two systems is identical, so adopted the combination of a low noise amplifier/frequency mixer, has only used a local frequency signal, the centre frequency of intermediate-freuqncy signal is also identical like this, i.e. IF1=IF2.Two difference of system on frequency are the bandwidth difference, so, when system received gps system L1 frequency band signals, corresponding to P11-P12 path, it was 2.046MHz that the bandwidth of a control signal image-reject filter 502 of steering logic output is set to BW1; When system received the Galileo L1 of system frequency band signals, corresponding to P13-P14 path, it was 4.092MHz that the bandwidth of the control signal image-reject filter 502 of steering logic output is set to BW2.Export follow-up baseband processing chip to after the output signal process amplification of wave filter and the analog to digital conversion.Like this, just finished the frequency conversion of different satellite system signal and converted the signal that is suitable for subsequent treatment to, realized that the multi-mode satellite navigation signal receives.
From Fig. 4 and two multi-mode satellite navigation receiving radio frequency front end chip structure embodiment shown in Figure 5, illustrated that the present invention has the front-end functionality of two kinds of satellite navigation systems of compatibility of multiple structure.At present and the satellite navigation system in building be two or more, apparent, by method of the present invention, adopt basic composition theory diagram as shown in Figure 3, constitute multi-mode satellite navigation receiving radio frequency front end chip, receive two or more satellite navigation system signals.
The field such as vehicle-mounted, mobile phone that can be applicable to of the present invention, can improve greatly the location accuracy, receive the sensitivity of multi-mode satellite navigation system signal and have the superperformance that adaptation is easily portable, satisfy low-power consumption.
Claims (10)
1. multi-mode satellite navigation receiving front-end chip, the architecting method of its Low Medium Frequency, multi-mode satellite navigation receiving front-end comprises:
(1) the receiving front-end input end directly connects antenna, and the satellite-signal that antenna is received directly enters chip; Can receive multiple different satellite navigation system signals, need not to connect active antenna;
(2) input stage adopts the low noise amplifier/bank of mixers that constitutes of one or more low noise amplifier/frequency mixer; Reception has the satellite navigation signals of same frequency band, and is identical or be more or less the same because of its rf frequency parameter, then can use the combination of same low noise amplifier/frequency mixer; Reception is in the satellite-signal of different frequency bands, according to number of frequency bands, then needs the combination of two or more low noise amplifier/frequency mixer, to adapt to the broad frequency range that receives multi-mode, different frequency bands satellite navigation signals; The different antenna that is connected of two or more low noise amplifier/frequency mixer, the low noise of finishing the different frequency bands satellite navigation signals automatically amplifies; Require low noise amplifier to have good high-gain and low-noise performance simultaneously;
(3) the dynamic reconfigurable image-reject filter of adjusting of frequency parameter of configuration; The centre frequency of this reconfigurable image-reject filter and bandwidth can be passed through steering logic, in predefined variable range, realize reconfiguring of frequency parameter, satisfy the bandpass filtering of reception multi-mode satellite navigation signal and the needs that mirror carrier frequencies suppresses, the mirror image of realizing various bandwidth suppresses filtering, and need not outside chip, to connect the intermediate-frequency filter device, make all modules of receiving front-end be integrated in monolithic chip;
(4) a configurable frequency synthesizer is set, has the configurable characteristic of frequency synthesis, can adapt to the demand of different satellite navigation system signals, the local oscillation signal of required one or more groups of different down coversion is provided;
(5) a variable bandwidth gain amplifier is set, its bandwidth covers the maximum frequency range of the intermediate-freuqncy signal after the satellite navigation signals down coversion of required reception, and the input dynamic range of bigger gain and broad is provided;
(6) analog to digital converter of configuration, the digital signal of its output is delivered to the follow-up baseband processing chip of receiving front-end;
(7) a multi-mode control logic module is set, receives the satellite navigation system selection signal that base band is sent, convert configuration steering logic signal to above-mentioned low noise amplifier/bank of mixers, image-reject filter and frequency synthesizer.
2. multi-mode satellite navigation receiving front-end chip according to claim 1, its feature also is: multi-mode satellite navigation receiving front-end chip is a single-chip, it is integrated with low noise amplifier/bank of mixers (301), reconfigurable image-reject filter (302), variable bandwidth gain amplifier (303), analog to digital converter (304), configurable frequency synthesizer (305) and (306) six modules of multi-mode steering logic, wherein:
One group of low noise amplifier/mixer module (301) has one or more input ends to connect antenna, there are one or more input ends to connect the local oscillation signal end of frequency mixer, have the output terminal of one or more high-gains, noiselike signal to connect the configurable image-reject filter of frequency parameter (302);
A configurable image-reject filter of frequency parameter (302) has an input end to connect one group of low noise amplifier/frequency mixer (301), has an output terminal to connect variable bandwidth gain amplifier (303);
A variable bandwidth gain amplifier module (303), it has an input end to connect configurable image-reject filter (302), and an output terminal connection mode number converter (304) is arranged;
An analog to digital converter module (304), it has an input end to connect variable bandwidth gain amplifier (303), has an output terminal to connect the follow-up baseband processing chip of front-end chip, and it also is the output terminal of multi-mode satellite navigation receiving front-end chip (211);
A configurable frequency synthesizer module (305), it has one or more local oscillation signal output terminals to connect the local oscillation signal end of low noise amplifier/bank of mixers (301) frequency mixer respectively;
Multi-mode control logic module (306) has a plurality of output terminals, is connected respectively to the pattern control end of low noise amplifier/bank of mixers (301), image-reject filter (302) and frequency synthesizer (305); Multi-mode control logic module (306) has an input end, connects a control output end of follow-up baseband chip.
3. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described low noise amplifier/bank of mixers comprises the combination of one or more low noise amplifier/frequency mixer; According to the frequency band of different satellite system work, from one group of low noise amplifier/bank of mixers (301), select the combination of the low noise amplifier/frequency mixer of corresponding best performance.
4. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described low noise amplifier/bank of mixers, the fusion structure that is combined as high-gain and low noise low noise amplifier and frequency mixer of its each low noise amplifier/frequency mixer.
5. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described configurable frequency synthesizer be controlled by the chip controls logic manage, the output local frequency can select the frequency synthesizer of a suitable local frequency, the intermediate frequency center frequency duty optimum of signal after the down-converted according to the frequency of operation section of different satellite navigation systems.
6. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described configurable image-reject filter is that frequency parameter is controlled by the chip controls logic manage, centre frequency and bandwidth parameter are reconfigurable, suppress the requirement of filtering to be applicable to the intermediate frequency mirror image after the different satellite navigation system signals down-converted.
7. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: a plurality of steering logics in the configurable module of the parameter of described front-end chip are one or more change-over switch combinations.
8. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: the steering logic change-over switch in the configurable module of the parameter of described chip can be that individual module is controlled, also can constitute combination control to a plurality of modules by the change-over switch of a plurality of steering logics, the performance that makes it to be operated in the multi-mode satellite navigation receiving system is suitable and optimization.
9. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described multi-mode satellite navigation receiving front-end chip, can receive a kind of pattern satellite navigation system signals, or when receiving satellite navigation system signals more than a kind of pattern, the control of control logic module is switched with logic switch or is selected the superior with time division multiplex and the output of many signals, is controlled in real time by the base-band software control signal of forward end chip feedback.
10. multi-mode satellite navigation receiving front-end chip according to claim 1 and 2, its feature also is: described front-end chip is the highly integrated chip that a slice realizes based on CMOS technology.
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