CN202696595U - Time division (TD)-long term evolution (LTE)/TD-synchronous code division multiple access (SCDMA) radio frequency front-end transceiver system - Google Patents
Time division (TD)-long term evolution (LTE)/TD-synchronous code division multiple access (SCDMA) radio frequency front-end transceiver system Download PDFInfo
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- CN202696595U CN202696595U CN2012202896373U CN201220289637U CN202696595U CN 202696595 U CN202696595 U CN 202696595U CN 2012202896373 U CN2012202896373 U CN 2012202896373U CN 201220289637 U CN201220289637 U CN 201220289637U CN 202696595 U CN202696595 U CN 202696595U
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Abstract
The utility model discloses a time division (TD)-long term evolution (LTE)/TD-synchronous code division multiple access (SCDMA) radio frequency front-end transceiver system. An output of one side of a radio frequency front-end circuit is connected with a baseband processor, and an output of the other side of the radio frequency front-end circuit is connected with the signal input end of a single-pole four-throw switch respectively through a first power amplifier and a second power amplifier; the input end of one side of the radio frequency front-end circuit is connected with the signal output end of the single-pole four-throw switch and is connected with a second antenna; an input of the other side of the radio frequency front-end circuit is connected with the baseband processor; and the single-pole four-throw switch is connected with a first antenna. According to the radio frequency front-end circuit, the signal input end of a receiver is connected with the signal output end of the single-pole four-throw switch, the second antenna and the output end of a frequency combiner respectively; the signal output end of the receiver is connected with the baseband processor; the signal input end of an emitter is connected with the baseband processor and the frequency combiner; and the signal output end of the emitter is connected with the signal input end of the single-pole four-throw switch respectively through the first power amplifier and the second power amplifier. By the TD-LTE/TD-SCDMA radio frequency front-end transceiver system, the complexity of the system is reduced, the cost of the system is reduced, and the performance of the system is improved.
Description
Technical field
The utility model relates to a kind of radio-frequency front-end transceiver.The TD-LTE/TD-SCDMA radio-frequency front-end transceiver system that particularly relates to the low and performance optimization of a kind of design cost.
Background technology
Along with the development of smart mobile phone and panel computer, the traffic carrying capacity of Mobile data increases substantially.LTE (Long Term Evolution) has improved the availability of frequency spectrum, has increased the capacity of transmission rate and accessible data.The development of its existing ecosystem is depended in the success or not of LTE technology, puts in place with the enforcement of infrastructure and compares, and transceiver technology must be with equally or faster speed development.
Because the explosive increase of the data use amount anticipated, this impels that operator must effectively use frequency spectrum resource and implements as early as possible the super many LTE technology of frequency range.This is the challenge of a transceiver design.Third generation partner program (3GPP) is responded this challenge with the method for unified FDD and TDD technology.At present, wireless communication spectrum (up to 3.8GHz) is divided into 43 frequency bands, and 1 to 33 frequency range is listed in LTE-FDD, and 33 to 43 LTE-TDD that are listed in.
From the angle of transceiver design, the challenge of existence is:
1, multiband: numerous LTE frequency band like this necessarily requires multiband transceiver.
2, multi-mode: the roaming at traditional managing network (WCDMA, the TD-SCDMA of EVDO, CDMA and GSM) requires the multi-mode transceiver.
3, two technology: two technology transceivers need to be supported TDD and FDD technology simultaneously.
0.7 the transceiver to the 2.7GHz frequency range need to be processed FDD and TDD technology simultaneously, with the FDD frequency range of support 1-21 and the TDD frequency range of 33-41.Here, need the problem of a large amount of numerical calculation disposal abilities, solve by computational load between allocation base provided with processor and the transceiver processor.For example, transceiver is worn embedded
Processor reduces the requirement to Base-Band Processing.Reduce simultaneously power consumption, improve dynamic adjustment capability and accelerated the response time.
Except multi-mode, outside the requirement of multiband, the Multifunctional radio-frequency transceiver of today also needs following characteristic:
Low-power consumption
Small size
Standardized baseband interface
Radio frequency interface flexibly
Carrier aggregation capacity
With the 3GPP operating such
China Mobile has begun to support at mobile phone the GMSK/GPRS/EDGE(GGE of four frequency ranges), TD-SCDMA, and TD-LTE standard are expected at the extensive use of beginning in 2012.In the face of this market of developing, the problem of some technical elements must solve for competitive.When considering the optimal strategy that this market is competed, must weigh frequency allocation, synchronous voice-and-data transmission, BOM cost, performance index.
Although smart mobile phone is the main target at the beginning that enters Chinese 4G LTE market, the hardware and software development plan also will be considered the segmenting market of other.Consideration also comprises the mature market as Europe and North America, and also zonal emerging market such as the India take TD-LTE as focus of district-share also have to look like softdog, and data card is such does not need other hardware product of voice service.
The design of the hardware and software that these extra factors can affect must be considered with the design object balance for China Mobile.Must avoid the extreme situation take high-end world-class telephony platform as target, such as the high pass that looks like to be applied to all regions, the chipset of Fujitsu and ST Ericsson.Can effectively solve any and chipset all regions.These chips do not meet cost benefit as middle end product.Preliminary market survey and the conclusion of technical discussion are the zonal mobile phones of optimizing, and it is low to have a cost, high-performance, low current.Such as envelope-tracking DCDC transducer, the characteristics such as antenna tuning/standing wave compensating circuit and close-loop power control, the product that differentiation is designed and solution.
Such as Fujitsu MB86Lxxx family chip system of Fujitsu, No. eight reflectors export driving chip external power amplifier, and nine the tunnel mainly input and support GSM with five tunnel less important inputs (DCS 1800 for GSM850, EGSM900, PCS 1900), WCDMA (frequency range I, II, III, IV, V, VI, VIII, IX, X, and XI), the LTE(FDD frequency range 1,3,4,6,7,8,9,10,11,13,17 and TDD frequency range 38 or 40).
Although it is compatible that above-mentioned solution is claimed with worldwide industrial standard, the mobile phone holder can worldwide roam, but also do not have in the completely specified situation in world standard, so the subject matter of design is that cost is too high, is not suitable in mobile phone, panel computer and the data card of shelves of the middle end.The main cause that cost is high has two, at first because radio frequency input and output more (27) cause chip package large (6.5mm x 9.0mm x 1.0mm), and design are limited by interface quantity.Secondly because numerous radio-frequency front-end amplifiers causes chip area larger, price does not have competitive advantage.
Because 2G second generation mobile phone market is very ripe, recycling from hardware and software, and the angle of time to market (TTM) is considered, the system schema of mobile phone is the broadband data functions that increases LTE/3G on the basis of original 2G voice scheme, so the mobile phone solution generally includes 6 functional modules: LTE/3G radio-frequency front-end transceiver, 2G radio-frequency front-end transceiver, baseband processor (Baseband), application processor (Application Processor), memory (Memory), power management module (Power Management Unit).The technical problems such as current TD-SCDMA power consumption and performance can not go on the market and promote on a large scale, are exactly because the single-minded not and refinement of design covets many standards and sacrifices chip performance.
In order to cover all frequency ranges of TD-LTE and TD-SCDMA, traditional implementation method as shown in Figure 1, receiver front end must use SAW (Surface Acoustic Wave) filter (SAW filter) to reduce interfering with each other between the frequency range, 34 wave bands, 38 wave bands, 39 wave bands and 40 wave bands, four wave bands need four SAW (Surface Acoustic Wave) filter, the LTE receiver requires variation (diversity) to improve data transfer rate and sensitivity, so other three SAW (Surface Acoustic Wave) filter are given three LTE wave bands: 38 wave bands, 39 wave bands and 40 wave bands.So receiver need to have 7 inputs altogether, 7 SAW (Surface Acoustic Wave) filter.
Summary of the invention
Technical problem to be solved in the utility model is, a kind of design cost and performance optimization are provided, the TDD frequency range of can the focal attention frequency spectrum relatively concentrating, from 1850MHz to 2660MHz, support simultaneously TD-SCDMA(3G) and TD-LTE/TD-SCDMA radio-frequency front-end transceiver system LTE-TDD(4G).
The technical scheme that the utility model adopts is: a kind of TD-LTE/TD-SCDMA radio-frequency front-end transceiver system, comprise baseband processor and radio-frequency (RF) front-end circuit, the one side output of described radio-frequency (RF) front-end circuit connects described baseband processor, the output of opposite side respectively by the first power amplifier be connected power amplifier and connect the signal input part of hilted broadsword 4 throw switches, the input of described radio-frequency (RF) front-end circuit one side connects respectively the signal output part of hilted broadsword 4 throw switches, and connect the second antenna, the input of opposite side connects baseband processor, and described hilted broadsword 4 throw switches also connect the first antenna.
The frequency synthesizer that described radio-frequency (RF) front-end circuit includes receiver, transmitter and connects respectively Receiver And Transmitter, wherein, the signal input part of described receiver connects respectively the output of signal output part, the second antenna and the frequency synthesizer of hilted broadsword 4 throw switches, and the signal output part of described receiver connects baseband processor; The signal input part of described transmitter connects respectively baseband processor and frequency synthesizer, the signal output part of described transmitter respectively by the first power amplifier be connected power amplifier and connect the signal input part of hilted broadsword 4 throw switches.
Described frequency synthesizer includes successively mutually Numerically Controlled Oscillator, phase discriminator/voltage pump, low pass filter, voltage controlled oscillator and the divider of series winding, be connected with the first multi-modulus frequency divider between described phase discriminator/voltage pump and the divider, described multi-modulus frequency divider also connects modulator, described voltage controlled oscillator also connects automatic frequency controller, and the output of described divider connects receiver, connects transmitter and connect receiver by the second multi-modulus frequency divider by emission local oscillator generator by receiving the local oscillator generator respectively.
Described receiver is to be connected respectively the signal output part of hilted broadsword 4 throw switches and two identical circuit of structure of the second antenna consist of by two-way, a described circuit includes variable gain low-noise amplifier, be connected to tracking filter and the frequency mixer of variable gain low-noise amplifier output, the input of described frequency mixer is the reception local oscillator generator in the rate of connections synthesizer also, output connects variable-gain intermediate frequency and amplifies and low pass filter, the input of described variable-gain intermediate frequency amplification and low pass filter is also respectively by the second multi-modulus frequency divider in the first digital to analog converter and the second digital to analog converter rate of connections synthesizer, described variable-gain intermediate frequency is amplified and the output of low pass filter passes through respectively the first digital to analog converter and is connected digital to analog converter connection baseband processor, wherein, the output of the variable gain low-noise amplifier in described two identical circuit of structure connects baseband processor by a power detector jointly.
Described transmitter includes the first radio frequency digital to analog converter, the second radio frequency digital to analog converter, triradius frequency weighted-voltage D/A converter and the 4th radio frequency digital to analog converter, described the first radio frequency digital to analog converter, the second radio frequency digital to analog converter, the input of triradius frequency weighted-voltage D/A converter and the 4th radio frequency digital to analog converter connects respectively the emission local oscillator generator in baseband processor and the frequency synthesizer, described the first radio frequency digital to analog converter be connected radio frequency digital to analog converter and connect the second power amplifier by the first transformer to output, described triradius frequency weighted-voltage D/A converter connects the first power amplifier with the 4th radio frequency digital to analog converter by the second transformer to output, the audio range frequency of described the first transformer is 1880～2025MHz, and the audio range frequency of described the second transformer is 2300～2620MHz.
Described radio-frequency (RF) front-end circuit is when the timing that is used for radio-frequency filter in the sheet, the frequency synthesizer that only activates a road in the identical circuit of structure in the receiver and be connected with this road circuit, the local oscillation signal frequency range that frequency synthesizer produces is 1880-2620MHz, and the frequency of oscillation of voltage controlled oscillator is 3760-5240MHz.
Described radio-frequency (RF) front-end circuit is when being used for realizing TD-SCDMAMA mode 34 wave bands and 39 wave band, activate a road in the identical circuit of structure and the frequency synthesizer that is connected with this road circuit in the receiver, and with transmitter that frequency synthesizer links to each other in the first radio frequency digital to analog converter, the second radio frequency digital to analog converter and the first transformer, local oscillation signal frequency range, receiver receive frequency range and transmitter transmit frequency range that frequency synthesizer produces are 1900-2025MHz, and the frequency of oscillation of voltage controlled oscillator is 3800-4050MHz.
Described radio-frequency (RF) front-end circuit is when being used for realizing TD-SCDMAMA pattern 40 wave band, activate a road in the identical circuit of structure and the frequency synthesizer that is connected with this road circuit in the receiver, and with transmitter that frequency synthesizer links to each other in triradius frequency weighted-voltage D/A converter and the 4th radio frequency digital to analog converter and the second transformer, local oscillation signal frequency range, receiver receive frequency range and transmitter transmit frequency range that frequency synthesizer produces are 2300-2400MHz, and the frequency of oscillation of voltage controlled oscillator is 4600-4800MHz.
Described radio-frequency (RF) front-end circuit is when being used for realizing TD-LTE mode 38 wave band, the frequency synthesizer that activate receiver, links to each other with receiver, and triradius frequency weighted-voltage D/A converter and the 4th radio frequency digital to analog converter and the second transformer in the transmitter that links to each other of frequency synthesizer, local oscillation signal frequency range, receiver receive frequency range and transmitter transmit frequency range that frequency synthesizer produces are 2570-2620MHz, and the frequency of oscillation of voltage controlled oscillator is 5140-5240MHz.
Described radio-frequency (RF) front-end circuit is when being used for realizing TD-LTE mode 39 wave band, the frequency synthesizer that activate receiver, links to each other with receiver, and the first radio frequency digital to analog converter, the second radio frequency digital to analog converter and the first transformer in the transmitter that links to each other of frequency synthesizer, local oscillation signal frequency range, receiver receive frequency range and transmitter transmit frequency range that frequency synthesizer produces are 1880-1900MHz, and the frequency of oscillation of voltage controlled oscillator is 3760-3800MHz.
TD-LTE/TD-SCDMA radio-frequency front-end transceiver system of the present utility model has following features:
1, requires the outer device of sheet few, reduce the system schema cost;
2, chip pin is few, reduces system complexity, reduces cost:
3, personalization, performance has been optimized in single-minded TD design, single-frequency synthesizer scheme, Cost reduction and reduce complexity;
4, the receiver front end straightened up in place has improved performance;
5, system schema and existing 2G system compatible shorten Time To Market.
The TDD frequency range that the TD-LTE/TD-SCDMA radio-frequency front-end system framework of design cost and performance optimization, focal attention frequency spectrum are concentrated relatively from 1850MHz to 2660MHz, is supported TD-SCDMA(3G simultaneously) and LTE-TDD(4G).
Description of drawings
Fig. 1 is the radio-frequency front-end transceiver system frame of prior art;
Fig. 2 is radio-frequency front-end transceiver system frame of the present utility model;
Fig. 3 is the realization system block diagram of TD-LTE/TD-SCDMA radio-frequency front-end;
Fig. 4 is radio frequency filter correction block diagram in the sheet;
Fig. 5 is the realization system block diagram of TD- SCDMA mode 34 and 39 wave bands;
Fig. 6 is the realization system block diagram of TD-SCDMA pattern 40 wave bands:
Fig. 7 is the realization system block diagram of TD-LTE mode 38 wave bands;
Fig. 8 is the realization system block diagram of TD-LTE mode 39 wave bands.
Embodiment
Below in conjunction with embodiment and accompanying drawing TD-LTE/TD-SCDMA radio-frequency front-end transceiver system of the present utility model is made a detailed description.
The utility model adopts the technical scheme of single-input double-output single-frequency synthesizer TD-LTE/TD-SCDMA,
As shown in Figure 2, TD-LTE/TD-SCDMA radio-frequency front-end transceiver system of the present utility model, comprise baseband processor 2 and radio-frequency (RF) front-end circuit 1, the one side output of described radio-frequency (RF) front-end circuit 1 connects described baseband processor 2, the output of opposite side respectively by the first power amplifier 3 be connected power amplifier 4 and connect the signal input part of hilted broadswords 4 throw switches 5, the input of described radio-frequency (RF) front-end circuit 1 one sides connects respectively the signal output part of hilted broadsword 4 throw switches 5, and connect the second antenna 7, the input of opposite side connects baseband processor 2, and described hilted broadsword 4 throw switches 5 also connect the first antenna 6.
B34 shown in Fig. 2, B39PA is the first power amplifier 3, is 34,49 wave band power amplifiers, and model is SKY77712, and producer is Skyworks;
Shown B38, B40PA is the second power amplifier 4, is 38,40 wave band power amplifiers, and model is SKY77441, and producer is Skyworks;
Shown SP4T is high power hilted broadsword 4 throw switches 5, High-Power Single Pole Four Throw (SP4T), and model is that SKY14151-350LF producer is Skyworks,
Shown BBIC, LTE baseband chip are baseband processor 2, TD-LTE/TD-SCDMA/GSM Baseband Modem, and producer is Spreadtrum, model is SC9610,
As shown in Figure 3, described radio-frequency (RF) front-end circuit 1 includes receiver 11, transmitter 12 and connects respectively receiver 11 and the frequency synthesizer 13 of transmitter 12, wherein, the signal input part of described receiver 11 connects respectively the output of signal output part, the second antenna 7 and the frequency synthesizer 13 of hilted broadsword 4 throw switches 5, and the signal output part of described receiver 11 connects baseband processor 2; The signal input part of described transmitter 12 connects respectively baseband processor 2 and frequency synthesizer 13, the signal output part of described transmitter 12 respectively by the first power amplifier 3 be connected power amplifier 4 and connect the signal input part of hilted broadswords 4 throw switches 5.
Described frequency synthesizer 13 includes successively the mutually Numerically Controlled Oscillator 131 of series winding, phase discriminator/voltage pump 133, low pass filter 135, voltage controlled oscillator 138 and divider 139, be connected with the first multi-modulus frequency divider 136 between described phase discriminator/voltage pump 133 and the divider 139, described multi-modulus frequency divider 136 also connects modulator 134, described voltage controlled oscillator 138 also connects automatic frequency controller 137, and the output of described divider 139 connects receiver 11 by receiving local oscillator generator 414 respectively, connect transmitter 12 and connect receiver 11 by the second multi-modulus frequency divider 132 by emission local oscillator generator 140.
Described receiver 11 is to be connected respectively the signal output part of hilted broadsword 4 throw switches 5 and two identical circuit of structure of the second antenna 7 consist of by two-way, a described circuit includes variable gain low-noise amplifier 111/112, be connected to tracking filter 113/114 and the frequency mixer 116/117 of variable gain low-noise amplifier 111/112 output, the input of described frequency mixer 116/117 is the reception local oscillator generator 414 in the rate of connections synthesizer 13 also, output connects variable-gain intermediate frequency and amplifies and low pass filter 118/119, the input of described variable-gain intermediate frequency amplification and low pass filter 118/119 is also respectively by the second multi-modulus frequency divider 132 in the first digital to analog converter 1110/1112 and the second digital to analog converter 1111/1113 rate of connections synthesizer 13, described variable-gain intermediate frequency is amplified and the output of low pass filter 118/119 passes through respectively the first digital to analog converter 1110/1112 and is connected digital to analog converter 1111/1113 connection baseband processor 2, wherein, the variable gain low-noise amplifier 111 in described two identical circuit of structure, 112 output connects baseband processor 2 by a power detector 115 jointly.
Described transmitter 12 includes the first radio frequency digital to analog converter 121, the second radio frequency digital to analog converter 122, triradius frequency weighted-voltage D/A converter 123 and the 4th radio frequency digital to analog converter 124, described the first radio frequency digital to analog converter 121, the second radio frequency digital to analog converter 122, the input of triradius frequency weighted-voltage D/A converter 123 and the 4th radio frequency digital to analog converter 124 connects respectively the emission local oscillator generator 140 in baseband processor 2 and the frequency synthesizer 13, described the first radio frequency digital to analog converter 121 be connected radio frequency digital to analog converter 122 and connect the second power amplifier 4 by the first transformer 125 to output, described triradius frequency weighted-voltage D/A converter 123 connects the first power amplifier 3 with the 4th radio frequency digital to analog converter 124 by the second transformer 126 to output, the audio range frequency of described the first transformer 125 is 1880～2025MHz, and the audio range frequency of described the second transformer 126 is 2300～2620MHz.
Receiver (Receiver) comprises two-way, and two line structures are identical, above receiver indicate variation (Divercity) sign, be special in realizing the standard-required of LTE, utilize variation, multichannel to improve data transfer rate and sensitivity.Receiver section the first module is low noise amplifier (Low Noise Amplifier, LNA), in the low noise while of assurance itself, by the noise of its consistent rear module that gains.Thereafter variable gain module (Varibl Gain Amplifier, VGA), be used for the gain of control low noise amplifier, satisfy the requirement of receiver dynamic range, namely according to making receiver can regulate according to the size of input signal the size of its gain.Tracking filter (Tracking Filter) is adjusted the filter center frequency according to receiving channels information, and the filtering band disturbs outward, and the frequency mixer after the protection is operated in its linearity scope.The filtered signal power size of power detector perception arranges receiver for baseband processor provides signal power information.Frequency mixer is the frequency signal of local oscillator generator and receive frequency mixing, the frequency signal that receives is converted into low frequency signal, intermediate frequency programmable gain amplifier (Programmable Gain Amplifier, PGA), further small-signal is amplified to the accessible amplitude of analog to digital converter, ride gain adapts to different input signal amplitudes simultaneously.Low pass filter (Low Pass Filter, LPF) is interference signal outside intermediate frequency filtering band further, guarantees that signal is in the accessible dynamic range of signals of digital to analog converter (Analog to Digital Converter, ADC).Digital to analog converter is analog signal conversion digital signal, processes for digital baseband processor (Baseband, BB).
Digital control crystal oscillator (Digital Controled Controlled Crystal Oscilator Oscillator, DCXO) utilize the comparatively accurately outer crystal oscillator of sheet, oscillating circuit is combined and is produced accurate 26MHz frequency signal as the reference source of frequency synthesizer in sheet, voltage controlled oscillator (Voltage Controled Ocsilator, VCO) frequency signal that produces through the simulation hair remover except after 2 by multi-mode hair remover (Multi-Modulas Divider, MMD) the 26MHz frequency signal after, by phase discriminator (Phase Frequency Detector, PFD) reference source with the Numerically Controlled Oscillator generation compares, the difference of their frequency and phase place is by voltage pump (Charge Pump, CP) be converted into voltage, come the voltage of feedback adjusting voltage controlled oscillator, thereby the accurate frequency signal of stable output, assorted the disturbing of introducing for suppressing the many mills of numeral frequency divider, between voltage pump and voltage controlled oscillator, add loop filter (Loop Filter, LP).Automatic frequency control (Automatic Frequency Control, AFC) is carried out coarse adjustment to the frequency of voltage controlled oscillator before locking.Delta-Sigma modulator (Delat-Sigma Modulator, DSM) is introduced modulation signal by adjusting the frequency division multiple of multi-modulus frequency divider.For the direct modulating mode of the frequency synthesizer of GMSK uses.
Transmitter is divided into high band (TX_HB) and low band (TX_LB) according to output frequency, high band covering frequence wave band is from 1880MHz to 2025MHz, low band covering frequence wave band is from 2300MHz to 2620MHz, corresponding for obtaining best peak value, corresponding high band transformer and low band transformer are arranged respectively.The quadrature I output of high band and Q output are cancelled image signal in the place's addition of high band transformer, owing to be differential design, local-oscillator leakage is herein cancellation also.The quadrature I output of low band and Q output are cancelled image signal in the place's addition of low band transformer, owing to be differential design, local-oscillator leakage is herein cancellation also.The local oscillator quadrature I of low band and Q frequency input signal be 1880MHz to 2025MHz, to be 23000MHz accept respectively the positive input signal TXI and the TXQ that are come by baseband processor to 2620MHz. high band and low band part for the local oscillator quadrature I of high band and Q frequency input signal.RFDAC is radio frequency digital to analog converter, and the back has a detailed description.
TD-LTE/TD-SCDMA radio-frequency front-end transceiver system of the present utility model, receiver uses recoverable in the sheet, reconfigurable filter, wave band 34 like this, 38,39 and 40, frequency signal shares same input from 1880MHz to 2620MHz, filter via Q enhancement mode in the sheet is selected signal according to receiving the frequency range difference, such system schema has reduced seven SAW (Surface Acoustic Wave) filter, thereby reduced cost, packing chip has reduced 6 receiver inlets, thereby has reduced the complexity and the feasibility that has improved system of system.Yet such receiver need to be in the face of the problem of filtering in high linear front end device and the sheet.
TD-LTE/TD-SCDMA radio-frequency front-end transceiver system of the present utility model, the characteristics that work in different conditions are as follows:
1, the realization of the multiband receiver of single-ended input
Because do not have the filter of front end, the front end transconductance stage (Gm) of variable gain low-noise amplifier 111/112 not only can be amplified small-signal, simultaneously in the face of power up to the band of 0dBm outside during interference signal (Blocker), can not distortion.For this reason, the utility model is taked AB class and the compound transconductance stage of category-A, and the interference signal arriving is that it is undistorted to provide more electric current to guarantee by the AB class, and guarantees small-signal linearity degree and sensitivity by the category-A transconductance stage outside band.Variable gain low-noise amplifier 111/112 is used for guaranteeing the dynamic range of receiver.Tracking filter 113/114 is positioned at the output of variable gain low-noise amplifier 111/112, by outputting inductance, electric capacity storehouse and negative transconductance three parts form, 1880～2620MHz target frequency bands relatively is conducive to the realization of higher Q value sheet internal inductance, to such an extent as to frequency is not very high and inductance value need not need too greatly very large chip area, the electric capacity storehouse is used for the adjustment aim frequency range, and negative transconductance can be brought up to whole Q value more than 20.In conjunction with the passive frequency mixer of duty ratio 25% local oscillator signals and intermediate frequency filtering afterwards, the 20MHz out of band signal that integral body reaches 20dBc suppresses ability, can reach the system index requirement simultaneously.
As shown in Figure 4, described radio-frequency (RF) front-end circuit 1, when a timing that only is used for radio-frequency filter in the sheet, the frequency synthesizer 13 that only activates a road in the identical circuit of structure in the receiver 11 and be connected with this road circuit.The local oscillation signal frequency range that frequency synthesizer 13 produces is 1880-2620MHz, and the frequency of oscillation of voltage controlled oscillator 138 is 3760-5240MHz.Be coated with the functional module of real module in trimming process, activating among Fig. 4, this moment, front-end module was programmed for oscillator by increasing the negative transconductance value, output baseband intermediate frequency signal after oscillator frequency and the mixing of frequency synthesizer signal, detect frequency by baseband circuit, set radio-frequency filter by the electric capacity storehouse of adjusting front end, make the front end device leave the concussion state by reducing negative transconductance after setting, enter magnifying state.This moment, radio-frequency filter Q value was the highest.
2, the realization of single-frequency synthesizer:
Because TD-LTE and TD-SCDMA are the systems of time division duplex (time division duplex TDD), receiving emission timesharing (not simultaneously) carries out, so receiver and reflector can use same frequency synthesizer, compare minimizing system complex degree with the bifrequency compositor system, reduced cost owing to reduce chip area simultaneously.
3, dual output reflector
As shown in Figure 2, since transmitter output spectrum degree of purity, the requirement of efficient and the linearity, and sheet is divided into independent high and low frequency two-way, the B38 of high frequency and B40, the B34 of low frequency and 39 outward.Transformation and single both-end transducer also are divided into independent high and low frequency path in RFDAC in the sheet and the sheet as a same reason, in order to optimize separately.
As shown in Figure 5, described radio-frequency (RF) front-end circuit 1 is when being used for realizing TD-SCDMA mode 34 wave bands and 39 wave band, activate a road and the frequency synthesizer 13 that is connected with this road circuit in the identical circuit of structure in the receiver 11, and with transmitter 12 that frequency synthesizer 13 links to each other in the first radio frequency digital to analog converter 121, the second radio frequency digital to analog converter 122 and the first transformer 125.Local oscillation signal frequency range, receiver 11 receive frequency ranges and transmitter transmit frequency range that frequency synthesizer 13 produces are 1900-2025MHz.The frequency of oscillation of voltage controlled oscillator 138 is 3800-4050MHz.
As shown in Figure 6, described radio-frequency (RF) front-end circuit 1 is when being used for realizing TD-SCDMA pattern 40 wave band, activate a road and the frequency synthesizer 13 that is connected with this road circuit in the identical circuit of structure in the receiver 11, and with transmitter 12 that frequency synthesizer 13 links to each other in triradius frequency weighted-voltage D/A converter 123 and the 4th radio frequency digital to analog converter 124 and the second transformer 126.Local oscillation signal frequency range, receiver 11 receive frequency ranges and transmitter transmit frequency range that frequency synthesizer 13 produces are 2300-2400MHz.The frequency of oscillation of voltage controlled oscillator 138 is 4600-4800MHz.
As shown in Figure 7, described radio-frequency (RF) front-end circuit 1 is when being used for realizing TD-LTE mode 38 wave band, the frequency synthesizer 13 that activate receiver 11, links to each other with receiver 11, and triradius frequency weighted-voltage D/A converter 123 and the 4th radio frequency digital to analog converter 124 and the second transformer 126 in the continuous transmitter 12 of frequency synthesizer 13.Local oscillation signal frequency range, receiver 11 receive frequency ranges and transmitter transmit frequency range that frequency synthesizer 13 produces are 2570-2620MHz.The frequency of oscillation of voltage controlled oscillator 138 is 5140-5240MHz.
As shown in Figure 8, described radio-frequency (RF) front-end circuit 1 is when being used for realizing TD-LTE mode 39 wave band, the frequency synthesizer 13 that activate receiver 11, links to each other with receiver 11, and the first radio frequency digital to analog converter 121, the second radio frequency digital to analog converter 122 and the first transformer 125 in the continuous transmitter 12 of frequency synthesizer 13.Local oscillation signal frequency range, receiver 11 receive frequency ranges and transmitter transmit frequency range that frequency synthesizer 13 produces are 1880-1900MHz.The frequency of oscillation of voltage controlled oscillator 138 is 3760-3800MHz.
Claims (10)
1. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system, comprise baseband processor (2) and radio-frequency (RF) front-end circuit (1), it is characterized in that, the one side output of described radio-frequency (RF) front-end circuit (1) connects described baseband processor (2), the output of opposite side is respectively by the first power amplifier (3) and the signal input part of power amplifier (4) connection hilted broadsword 4 throw switches (5) of being connected, the input of described radio-frequency (RF) front-end circuit (1) one side connects respectively the signal output part of hilted broadsword 4 throw switches (5), and connect the second antenna (7), the input of opposite side connects baseband processor (2), and described hilted broadsword 4 throw switches (5) also connect the first antenna (6).
2. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 1, it is characterized in that, described radio-frequency (RF) front-end circuit (1) includes receiver (11), transmitter (12) and connects respectively receiver (11) and the frequency synthesizer (13) of transmitter (12), wherein, the signal input part of described receiver (11) connects respectively the output of signal output part, the second antenna (7) and the frequency synthesizer (13) of hilted broadsword 4 throw switches (5), and the signal output part of described receiver (11) connects baseband processor (2); The signal input part of described transmitter (12) connects respectively baseband processor (2) and frequency synthesizer (13), and the signal output part of described transmitter (12) is respectively by the first power amplifier (3) and the signal input part of power amplifier (4) connection hilted broadsword 4 throw switches (5) of being connected.
3. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described frequency synthesizer (13) includes successively the mutually Numerically Controlled Oscillator (131) of series winding, phase discriminator/voltage pump (133), low pass filter (135), voltage controlled oscillator (138) and divider (139), be connected with the first multi-modulus frequency divider (136) between described phase discriminator/voltage pump (133) and the divider (139), described multi-modulus frequency divider (136) also connects modulator (134), described voltage controlled oscillator (138) also connects automatic frequency controller (137), and the output of described divider (139) connects receiver (11) by receiving local oscillator generator (414) respectively, connect transmitter (12) and connect receiver (11) by the second multi-modulus frequency divider (132) by emission local oscillator generator (140).
4. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described receiver (11) is the identical circuit formation of two structures that is connected respectively signal output part and second antenna (7) of hilted broadsword 4 throw switches (5) by two-way, a described circuit includes variable gain low-noise amplifier (111/112), be connected to tracking filter (113/114) and the frequency mixer (116/117) of variable gain low-noise amplifier (111/112) output, the input of described frequency mixer (116/117) is the reception local oscillator generator (414) in the rate of connections synthesizer (13) also, output connects variable-gain intermediate frequency and amplifies and low pass filter (118/119), the input of described variable-gain intermediate frequency amplification and low pass filter (118/119) is also respectively by the second multi-modulus frequency divider (132) in the first digital to analog converter (1110/1112) and the second digital to analog converter (1111/1113) the rate of connections synthesizer (13), described variable-gain intermediate frequency is amplified and the output of low pass filter (118/119) passes through respectively the first digital to analog converter (1110/1112) and is connected digital to analog converter (1111/1113) connection baseband processor (2), wherein, the variable gain low-noise amplifier (111 in described two identical circuit of structure, 112) output connects baseband processor (2) by a power detector (115) jointly.
5. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described transmitter (12) includes the first radio frequency digital to analog converter (121), the second radio frequency digital to analog converter (122), triradius frequency weighted-voltage D/A converter (123) and the 4th radio frequency digital to analog converter (124), described the first radio frequency digital to analog converter (121), the second radio frequency digital to analog converter (122), the input of triradius frequency weighted-voltage D/A converter (123) and the 4th radio frequency digital to analog converter (124) connects respectively the emission local oscillator generator (140) in baseband processor (2) and the frequency synthesizer (13), described the first radio frequency digital to analog converter (121) be connected radio frequency digital to analog converter (122) and connect the second power amplifier (4) by the first transformer (125) to output, described triradius frequency weighted-voltage D/A converter (123) connects the first power amplifier (3) with the 4th radio frequency digital to analog converter (124) by the second transformer (126) to output, the audio range frequency of described the first transformer (125) is 1880～2025MHz, and the audio range frequency of described the second transformer (126) is 2300～2620MHz.
6. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, the timing of described radio-frequency (RF) front-end circuit (1) radio-frequency filter within being used for sheet, the frequency synthesizer (13) that only activates a road in the middle identical circuit of structure of receiver (11) and be connected with this road circuit, the local oscillation signal frequency range that frequency synthesizer (13) produces is 1880-2620MHz, and the frequency of oscillation of voltage controlled oscillator (138) is 3760-5240MHz.
7. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described radio-frequency (RF) front-end circuit (1) is when being used for realizing TD-SCDMAMA mode 34 wave bands and 39 wave band, activate a road in the identical circuit of structure and the frequency synthesizer (13) that is connected with this road circuit in the receiver (11), and with transmitter (12) that frequency synthesizer (13) links to each other in the first radio frequency digital to analog converter (121), the second radio frequency digital to analog converter (122) and the first transformer (125), the local oscillation signal frequency range that frequency synthesizer (13) produces, receiver (11) receive frequency range and transmitter transmit frequency range are 1900-2025MHz, and the frequency of oscillation of voltage controlled oscillator (138) is 3800-4050MHz.
8. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described radio-frequency (RF) front-end circuit (1) is when being used for realizing TD-SCDMAMA pattern 40 wave band, activate a road in the identical circuit of structure and the frequency synthesizer (13) that is connected with this road circuit in the receiver (11), and with transmitter (12) that frequency synthesizer (13) links to each other in triradius frequency weighted-voltage D/A converter (123) and the 4th radio frequency digital to analog converter (124) and the second transformer (126), the local oscillation signal frequency range that frequency synthesizer (13) produces, receiver (11) receive frequency range and transmitter transmit frequency range are 2300-2400MHz, and the frequency of oscillation of voltage controlled oscillator (138) is 4600-4800MHz.
9. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described radio-frequency (RF) front-end circuit (1) is when being used for realizing TD-LTE mode 38 wave band, activate receiver (11), the frequency synthesizer (13) that links to each other with receiver (11), and triradius frequency weighted-voltage D/A converter (123) and the 4th radio frequency digital to analog converter (124) and the second transformer (126) in the transmitter (12) that links to each other of frequency synthesizer (13), the local oscillation signal frequency range that frequency synthesizer (13) produces, receiver (11) receive frequency range and transmitter transmit frequency range are 2570-2620MHz, and the frequency of oscillation of voltage controlled oscillator (138) is 5140-5240MHz.
10. TD-LTE/TD-SCDMA radio-frequency front-end transceiver system according to claim 2, it is characterized in that, described radio-frequency (RF) front-end circuit (1) is when being used for realizing TD-LTE mode 39 wave band, activate receiver (11), the frequency synthesizer (13) that links to each other with receiver (11), and the first radio frequency digital to analog converter (121) in the transmitter (12) that links to each other of frequency synthesizer (13), the second radio frequency digital to analog converter (122) and the first transformer (125), the local oscillation signal frequency range that frequency synthesizer (13) produces, receiver (11) receive frequency range and transmitter transmit frequency range are 1880-1900MHz, and the frequency of oscillation of voltage controlled oscillator (138) is 3760-3800MHz.
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|---|---|---|---|
| CN2012202896373U CN202696595U (en) | 2012-06-19 | 2012-06-19 | Time division (TD)-long term evolution (LTE)/TD-synchronous code division multiple access (SCDMA) radio frequency front-end transceiver system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012202896373U CN202696595U (en) | 2012-06-19 | 2012-06-19 | Time division (TD)-long term evolution (LTE)/TD-synchronous code division multiple access (SCDMA) radio frequency front-end transceiver system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710278A (en) * | 2012-06-01 | 2012-10-03 | 天津里外科技有限公司 | Time division-long term evolution (TD-LTE)/time division-synchronous code division multiple access (TD-SCDMA) radio-frequency front transmitter-receiver system |
| CN105827269A (en) * | 2015-09-24 | 2016-08-03 | 维沃移动通信有限公司 | Radio frequency signal transceiving device and electronic apparatus |
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2012
- 2012-06-19 CN CN2012202896373U patent/CN202696595U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102710278A (en) * | 2012-06-01 | 2012-10-03 | 天津里外科技有限公司 | Time division-long term evolution (TD-LTE)/time division-synchronous code division multiple access (TD-SCDMA) radio-frequency front transmitter-receiver system |
| CN105827269A (en) * | 2015-09-24 | 2016-08-03 | 维沃移动通信有限公司 | Radio frequency signal transceiving device and electronic apparatus |
| CN105827269B (en) * | 2015-09-24 | 2017-08-15 | 维沃移动通信有限公司 | A kind of radiofrequency signal R-T unit and electronic equipment |
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