CN202818280U - Mobile terminal and radio frequency front end thereof with radio frequency digital-to-analogue conversion type linear transmitter - Google Patents
Mobile terminal and radio frequency front end thereof with radio frequency digital-to-analogue conversion type linear transmitter Download PDFInfo
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- CN202818280U CN202818280U CN2012202223778U CN201220222377U CN202818280U CN 202818280 U CN202818280 U CN 202818280U CN 2012202223778 U CN2012202223778 U CN 2012202223778U CN 201220222377 U CN201220222377 U CN 201220222377U CN 202818280 U CN202818280 U CN 202818280U
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Abstract
The utility model discloses a mobile terminal, comprising a baseband processor, a radio frequency front end transceiver, two transmitting end power amplifiers and a radio frequency switch, wherein the radio frequency switch is connected with an antenna; the radio frequency front end transceiver is connected with the baseband processor and an antenna; and each transmitting end power amplifier is connected with the radio frequency front end transceiver. In addition, the utility model also discloses the radio frequency front end transceiver with a radio frequency digital-to-analog conversion type linear transmitter. According to the mobile terminal and the radio frequency front end thereof with the radio frequency digital-to-analog conversion type linear transmitter, the production cost of the mobile terminal can be remarkably reduced, the area of the whole chip of the mobile terminal is reduced, the strength of an output signal of a transmitter in the radio frequency front end transceiver can be improved, the overall performance and the market competitiveness of the mobile terminal are improved, and great production practice significance is realized.
Description
Technical field
The utility model relates to the mobile communication technology field, particularly relates to the portable terminal that is applicable to the various kinds of mobile communication standard and has the radio-frequency front-end of radio frequency digital-to-analogue conversion formula linear transmitter.
Background technology
At present, along with the development of smart mobile phone and panel computer, the traffic carrying capacity of global Mobile data increases substantially.Wherein, LTE(Long Term Evolution, Long Term Evolution) exploitation of technology, not only improved the availability of frequency spectrum of radio communication, also increased simultaneously message transmission rate and the accessible data capacity of radio communication.
At present, the wireless communication spectrum of LTE technology (frequency is up to 3.8 GHz) can be divided into 43 wave bands, and 1 to 33 wave band is listed in the LTE-FDD(Frequency Division Duplexing (FDD)), and the LTE-TDD(time division duplex frequency range that 33 to 43 wave bands are listed in).
Because mobile operator anticipates that the data use amount of telex network will increase substantially, like this so that mobile operator need to effectively utilize existing wireless communication spectrum resource, and implement as early as possible to cover comparatively widely LTE technology of frequency range.In order to promote extensively popularizing of LTE technology, when carrying out the LTE infrastructure construction, the signal transmitting and receiving technology in the portable terminal also needs synchronously or the faster speed development.At this time, mobile operator and other producers need to go into overdrive to carry out the technical research of portable terminal, purpose is so that a portable terminal, it has the function of multiband, multi-mode, two technology, namely so that the signal transceiver that portable terminal has can cover existing LTE radio communication wave band, simultaneously can compatible conventional communication networks (TD-SCDMA of WCDMA, EVDO, CDMA and GSM network), and support TDD and FDD technology.Need to prove that for present 3G (Third Generation) Moblie technology (3rd-generation, 3G), it includes four kinds of standard: CDMA2000, WCDMA, TD-SCDMA, WiMAX.
Wherein, the wireless communication spectrum allocation table of existing the 4th generation radio communication LTE as shown in table 1:
Referring to table 1, signal transceiver (being the radio-frequency front-end transceiver) for the 0.7 ~ 2.7GH frequency range that has portable terminal now, in order to allow portable terminal can process simultaneously FDD and TDD technology (function that namely has two technology), to support 1 ~ 21 FDD wave band and 33 ~ 41 TDD frequency range, need to improve the digital operating ability of portable terminal, by described signal transceiver is connected with baseband processor, thus the computational load between proper placement baseband processor and the signal transceiver.
Referring to Fig. 1, for the portable terminal that has at present the LTE/TD-SCDMA communication function (such as a mobile phone), it has generally included six functional modules, be specially: LTE/TD-SCDMA radio-frequency front-end transceiver, 2G(Generation Mobile Telecommunication System technology, for example GSM) radio-frequency front-end transceiver, baseband processor (Base band), application processor (Application Processor), memory (Memory) and power management module (Power Management Unit).
In order to cover TD-LTE(timesharing Long Term Evolution) with the TD-SCDMA(TD SDMA) all channels of communicating by letter, referring to Fig. 2, the signal transmitter (TX) that existing tradition has the portable terminal of LTE/TD-SCDMA communication function also has the two-way output, simultaneously, use SAW (Surface Acoustic Wave) filter (SAW filter) by the front end at signal transceiver (being radio-frequency front-end transceiver RFIC) inner receiver, to reduce interfering with each other between two wave bands.For example, for the transceiver (RX) that is used for receiving TD-SCDMA and TD-LTE signal, have the wave band that four signals receive, be specially 34 wave bands, 38 wave bands, 39 wave bands and 40 wave bands, altogether need to use four SAW (Surface Acoustic Wave) filter.And for the transceiver (LTE RX) that is used for receiving the TD-LTE signal, require variation (diversity) to improve data transfer rate and sensitivity, therefore, have three and be specifically designed to the LTE wave band that receives the TD-LTE signal, be specially: 38 wave bands, 39 wave bands and 40 wave bands.Therefore, as shown in Figure 2, the signal transceiver of portable terminal (being the radio-frequency front-end transceiver) has altogether 7 signal input parts and 7 SAW (Surface Acoustic Wave) filter, be specially: throw (SP6T) radio-frequency (RF) switch place at hilted broadsword six and have 4 signal input parts, the place has 3 signal input parts at SP3T (SP3T) switch.Therefore, the signal RF input of existing portable terminal is more, and has more Surface Acoustic Wave Filter, thereby cause the production cost of signal transceiver (being the radio-frequency front-end transceiver) of portable terminal higher, lost the price competitiveness of portable terminal, and greatly increased the area of the whole chip of portable terminal, the mobile terminal chip area is larger, and then has had a strong impact on the market application foreground of portable terminal.
Therefore, at present in the urgent need to developing a kind of technology, it can be under the prerequisite that guarantees mobile terminal performance, effectively reduce the production cost of mobile terminal radio frequency front-end transceiver and the area that reduces transponder chip, and then area and the production cost of the whole chip of reduction portable terminal, improve the price competitiveness of portable terminal, enlarge the market application foreground of portable terminal.
The utility model content
In view of this, the purpose of this utility model provides a kind of radio-frequency front-end that is applicable to the portable terminal of various kinds of mobile communication standard and has radio frequency digital-to-analogue conversion formula linear transmitter, this portable terminal is by the integrated Radio Frequency Tracking filter that arranges in the radio-frequency front-end transceiver, can not need at the input of radio-frequency front-end transceiver inner receiver a plurality of SAW (Surface Acoustic Wave) filter quantity be set, reduce simultaneously the input quantity of radio-frequency front-end transceiver inner receiver, the area that therefore can significantly reduce the production cost of portable terminal and reduce the whole chip of portable terminal, and can improve the intensity of transmitter institute output signal in the radio-frequency front-end transceiver, the overall performance of lifting mobile terminal and the market competitiveness are of great practical significance.
For this reason, the utility model provides a kind of many standards portable terminal, includes a baseband processor, a radio-frequency front-end transceiver, two transmitting terminal power amplifiers and a radio-frequency (RF) switch;
Described radio-frequency (RF) switch is connected with an antenna;
Described radio-frequency front-end transceiver is connected with baseband processor, an antenna respectively, be used for the external signal by a plurality of wave bands of antenna reception, and receive the difference of frequency range according to external signal, and external signal is selected, then selected signal is transmitted to the transmitting terminal power amplifier;
Each transmitting terminal power amplifier is connected with the radio-frequency front-end transceiver, is used for received signal is amplified processing, then sends antenna to by described radio-frequency (RF) switch, carries out the signal emission by antenna.
Wherein, described radio-frequency front-end transceiver RFIC includes a receiver, a frequency synthesizer and a transmitter, and the front end of described receiver is provided with one or more Radio Frequency Tracking filter.
Wherein, described receiver includes two low noise amplifier LNA, and the end of described two low noise amplifier LNA joins with a signal input part RXIN respectively;
The other end of described two low noise amplifier LNA joins with a variable gain amplifier VGA respectively, the mixer combination that each described variable gain amplifier VGA connects respectively a Radio Frequency Tracking filter and is comprised of two frequency mixer Mixer, and be connected with a power detector between two described variable gain amplifier VGA;
Each described mixer combination and variable-gain intermediate frequency are amplified and low pass filter PGA/LPF joins, and each variable-gain intermediate frequency amplification and low pass filter join with two digital to analog converter ADC respectively, and each digital to analog converter ADC and baseband processor are joined.
Wherein, described frequency synthesizer includes and receives the local oscillator generator, and described reception local oscillator generator respectively sending and receiving is penetrated two mixer combination in local oscillator generator, divider, multi-modulus frequency divider MMD and the described receiver;
Described divider meets voltage controlled oscillator VCO, loop filter LF and phase discriminator and voltage pump concatenation module PFD/CP successively, described phase discriminator and voltage pump concatenation module connect respectively a Numerically Controlled Oscillator and a multi-modulus frequency divider, described multi-modulus frequency divider meets respectively described divider and a modulator DSM, and described voltage controlled oscillator VCO is also joined with an automatic frequency controller AFC.
Wherein, described transmitter includes four digital to analog converter combinations, and each digital to analog converter combination includes a frequency mixer and a radio frequency digital to analog converter RFDAC, and described frequency mixer and radio frequency digital to analog converter RFDAC join;
Wherein frequency mixer and the same low band transformer in the combination of two digital to analog converters joins, and two digital to analog converters in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join; Frequency mixer and same high band transformer in the combination of two other digital to analog converter join, and digital to analog converter in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join.
Wherein, radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the low band transformer also joins by the emission local oscillator generator in a divider and the described frequency synthesizer, and the radio frequency digital to analog converter RFDAC during two described digital to analog converters that join with the high band transformer make up also joins by the emission local oscillator generator in a divider and the described frequency synthesizer;
Frequency mixer in two described digital to analog converters combinations of joining with the low band transformer joins with emission local oscillator generator, and the frequency mixer in two described digital to analog converters combinations of joining with the high band transformer also joins with emission local oscillator generator.
Wherein, the sample frequency fs of described radio frequency digital to analog converter RFDAC equals 1/2nd of local frequency fLO.
In addition, the utility model also provides a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter, include a receiver, a frequency synthesizer and a transmitter, the front end of described receiver is provided with one or more Radio Frequency Tracking filter.
Wherein, described receiver includes two low noise amplifier LNA, and the end of described two low noise amplifier LNA joins with a signal input part RXIN respectively;
The other end of described two low noise amplifier LNA joins with a variable gain amplifier VGA respectively, the mixer combination that each described variable gain amplifier VGA connects respectively a Radio Frequency Tracking filter and is comprised of two frequency mixer Mixer, and be connected with a power detector between two described variable gain amplifier VGA;
Each described mixer combination and variable-gain intermediate frequency are amplified and low pass filter PGA/LPF joins, and each variable-gain intermediate frequency amplification and low pass filter join with two digital to analog converter ADC respectively, and each digital to analog converter ADC and baseband processor are joined;
Described frequency synthesizer includes and receives the local oscillator generator, and described reception local oscillator generator respectively sending and receiving is penetrated two mixer combination in local oscillator generator, divider, multi-modulus frequency divider MMD and the described receiver;
Described divider meets voltage controlled oscillator VCO, loop filter LF and voltage pump formula phase discriminator PFD/CP successively, described voltage pump formula phase discriminator connects respectively a Numerically Controlled Oscillator and a multi-modulus frequency divider, described multi-modulus frequency divider meets respectively described divider and a modulator DSM, and described voltage controlled oscillator VCO is also joined with an automatic frequency controller AFC;
Described transmitter includes four digital to analog converter combinations, and each digital to analog converter combination includes a frequency mixer and a radio frequency digital to analog converter RFDAC, and described frequency mixer and radio frequency digital to analog converter RFDAC join;
Wherein frequency mixer and the same low band transformer in the combination of two digital to analog converters joins, and two digital to analog converters in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join; Frequency mixer and same high band transformer in the combination of two other digital to analog converter join, and digital to analog converter in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join.
Wherein, radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the low band transformer also joins by the emission local oscillator generator in a divider and the described frequency synthesizer, and the radio frequency digital to analog converter RFDAC during two described digital to analog converters that join with the high band transformer make up also joins by the emission local oscillator generator in a divider and the described frequency synthesizer;
Frequency mixer in two described digital to analog converters combinations of joining with the low band transformer joins with emission local oscillator generator, and the frequency mixer in two described digital to analog converters combinations of joining with the high band transformer also joins with emission local oscillator generator.
Wherein, the sample frequency fs of described radio frequency digital to analog converter RFDAC equals 1/2nd of local frequency fLO.
Wherein, described radio frequency digital to analog converter RFDAC includes d type flip flop DFF, the grid G of described d type flip flop DFF and two N-type MOS switching tube NMOS1 and NMOS2 is joined, the drain D of described NMOS1 and NMOS2 switching tube is joined with described frequency mixer respectively, the source S of described NMOS1 and NMOS2 switching tube drain D common and a N-type MOS switching tube NMOS3 is joined, the grid G of described switching tube NMOS3 respectively with the grid G of a switching tube NMOS4, drain D is joined, the source S ground connection of described switching tube NMOS4 and NMOS3, the drain D of described switching tube NMOS4 meet a direct current biasing control signal Bias_ctrl successively, a supply power voltage V
DD
The technical scheme that is provided by above the utility model as seen, compared with prior art, the utility model provides a kind of radio-frequency front-end that is applicable to the portable terminal of various kinds of mobile communication standard and has radio frequency digital-to-analogue conversion formula linear transmitter, this portable terminal is by the integrated Radio Frequency Tracking filter that arranges in the radio-frequency front-end transceiver, come external signal is selected according to the difference that this terminal signaling receives frequency range by the Radio Frequency Tracking filter, thereby can not need at the input of radio-frequency front-end transceiver inner receiver a plurality of SAW (Surface Acoustic Wave) filter quantity be set, reduce simultaneously the signal input part quantity of radio-frequency front-end transceiver inner receiver, the area that therefore can significantly reduce the production cost of portable terminal and reduce the whole chip of portable terminal, thereby therefore the market competitiveness of lifting mobile terminal is of great practical significance.
In addition, the utility model also is optimized setting by the proportion to radio frequency digital to analog converter in the transmitter in the radio frequency front-end transceiver, further improve the intensity of transmitter institute output signal in the radio-frequency front-end transceiver, promoted the overall performance of portable terminal.
Description of drawings
Fig. 1 is existing a kind of structure diagram with portable terminal of LTE/TD-SCDMA communication function;
Fig. 2 is existing signal transmission schematic diagram with portable terminal of LTE/TD-SCDMA communication function;
The signal transmission schematic diagram of a kind of many standards portable terminal that Fig. 3 provides for the utility model;
The structured flowchart of radio-frequency front-end transceiver in a kind of many standards portable terminal that Fig. 4 provides for the utility model;
The correction block diagram of radio frequency tracking filter in the radio-frequency front-end transceiver in a kind of many standards portable terminal that Fig. 5 provides for the utility model;
In a kind of many standards portable terminal that Fig. 6 provides for the utility model in the radio-frequency front-end transceiver, the structured flowchart of a kind of IQ quadrature transmitter that has;
Fig. 7 carries out the schematic diagram that the filtering harmonic wave repeats frequency spectrum processing for logarithmic mode transducer in existing traditional linear transmitter;
Fig. 8 repeats spectrogram for the harmonic wave that has the sample frequency fs that digital to analog converter DAC produces in traditional linear transmitter now;
Fig. 9 is for having the transfer function schematic diagram of low pass filter in traditional linear transmitter now;
Figure 10 is for having the output spectrum figure of low pass filter in traditional linear transmitter now;
The spectrogram of Figure 11 after for existing traditional linear transmitter mixing;
In a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter that Figure 12 provides for the utility model, the connection diagram of radio frequency digital to analog converter and frequency mixer in the linear transmitter;
The spectrogram one of the output signal of radio frequency digital-to-analogue conversion formula linear transmitter in Figure 13 the utility model provides a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter;
The spectrogram two of the output signal of radio frequency digital-to-analogue conversion formula linear transmitter in Figure 14 the utility model provides a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter;
In a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter that Figure 15 provides for the utility model, the physical circuit connection diagram of radio frequency digital to analog converter and frequency mixer in the linear transmitter;
In a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter that Figure 16 provides for the utility model, the oscillogram of radio frequency digital to analog converter RFDAC in the linear transmitter;
In a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter that Figure 17 provides for the utility model, the uniform enconding integrated circuit figure of radio frequency digital to analog converter RFDAC in the linear transmitter.
Embodiment
In order to make those skilled in the art person understand better the utility model scheme, the utility model is described in further detail below in conjunction with drawings and embodiments.
Referring to Fig. 3, the utility model provides a kind of many standards portable terminal, can cover TD-LTE(timesharing Long Term Evolution) with the TD-SCDMA(TD SDMA) all channels of communicating by letter, TD-LTE and TD-SCDMA signal are carried out reception ﹠ disposal, it includes a baseband processor BBIC 101, radio-frequency front-end transceiver RFIC 102, two transmitting terminal power amplifier PA 103 and a radio-frequency (RF) switch 104, described radio-frequency (RF) switch 104 is connected with an antenna 105, wherein:
Baseband processor BBIC 101, are used for carrying out data processing and the storage of mobile communication process;
Radio-frequency front-end transceiver RFIC 102, be connected with baseband processor 101, an antenna 105 respectively, be used for the external signal by a plurality of wave bands of antenna reception, and receive the difference of frequency range according to external signal, external signal is selected, then selected signal is transmitted to transmitting terminal power amplifier 103;
Each transmitting terminal power amplifier PA 103 is connected with radio-frequency front-end transceiver RFIC 102, is used for received signal is amplified processing, then sends the antenna 105 that is connected to by described radio-frequency (RF) switch, carries out the signal emission by antenna 105.
In the utility model, referring to Fig. 3, described radio-frequency (RF) switch 104 is specially hilted broadsword four and throws (SP4T) switch.
For the utility model, described radio-frequency front-end transceiver RFIC 102 includes a receiver 1021, a frequency synthesizer 1022 and transmitter 1,023 three parts, and wherein, described receiver 1021 is used for receiving in real time the signal that exterior antenna is transmitted; Described frequency synthesizer 1022 joins with receiver, transmitter respectively, for generation of local oscillation signal, and the signal at the frequency of local oscillation signal and transmitter or receiver place is carried out the frequency stack is synthetic to be processed; Described transmitter 1023 is used for signal is passed through radio-frequency (RF) switch, finally launches.
In the utility model, on the specific implementation, described radio-frequency front-end transceiver RFIC 102 is provided with one or more Radio Frequency Tracking filter at the front end of receiver 1021, described Radio Frequency Tracking filter is the band pass filter that can carry out to the signal of the required frequency of portable terminal preliminary election, it is the filter of Q factor Q enhancement mode, can suppress outside image frequency, reduce local oscillator via the radiation of antenna.Therefore, radio-frequency front-end transceiver 102 of the present utility model can receive according to external signal the difference of frequency range by being provided with this Radio Frequency Tracking filter, and external signal is selected.For example, present need not in the communication spectrum, and for the TD-SCDMA signal of 34 wave bands, its frequency range is 2010 ~ 2025MHZ; For the TD-LTE signal of 38 wave bands, its frequency range is 2570-2620 MHZ; For the TD-LTE signal of 39 wave bands, its frequency range is 1880 ~ 1900MHZ; For the TD-SCDMA signal of 39 wave bands, its frequency range is 1900 ~ 1920MHZ; For the TD-SCDMA signal of 40 wave bands, its frequency range is 2300 ~ 2400MHZ.Therefore, in view of the TD-LTE signal of different-waveband has different frequency ranges with the TD-SCDMA signal, therefore, the utility model only needs according to different frequency ranges, and can distinguish different-waveband, dissimilar signal, realization is selected external signal, has avoided the phase mutual interference between two band signal.
Therefore, as mentioned above, the utility model compared with prior art, be provided with the Radio Frequency Tracking filter by the front end at receiver 1021, thereby need not to be provided for again reducing a plurality of SAW (Surface Acoustic Wave) filter that interfere with each other (SAW filter) between two wave bands, referring to Fig. 3, correspondingly can also reduce simultaneously the signal input part quantity of radio-frequency front-end transceiver inner receiver, the area that therefore can significantly reduce the production cost of portable terminal and reduce the whole chip of portable terminal, and then the market competitiveness of lifting mobile terminal.
Referring to Fig. 4, for the utility model, the radio-frequency front-end transceiver that provides a kind of many standards portable terminal to have, radio-frequency front-end transceiver of the present utility model can be realized single-ended input, binary channel output and single-frequency synthesizer in the lump.On the specific implementation, the utility model radio-frequency front-end transceiver RFIC 102 includes receiver 1021, frequency synthesizer 1022 and transmitter 1,023 three parts, wherein:
For receiver (Receiver) 1021, it includes two low noise amplifier LNA, the end of described two low noise amplifier LNA joins with a signal input part RXIN respectively, one of them signal input part RXIN directly connects antenna 105, and another one signal input part RXIN joins by radio-frequency (RF) switch 104 and antenna 105; The other end of described two low noise amplifier LNA joins with a variable gain amplifier VGA respectively, the mixer combination that each described variable gain amplifier VGA connects respectively a Radio Frequency Tracking filter (Tracking Filter) and is comprised of two frequency mixer Mixer, and be connected with a power detector (Power Detector) between two described variable gain amplifier VGA; Each described mixer combination and a variable-gain intermediate frequency are amplified and low pass filter (PGA/LPF, being about to intermediate frequency programmable gain amplifier PGA and low pass filter LPF is cascaded) join, each variable-gain intermediate frequency is amplified and low pass filter joins with two digital to analog converter ADC respectively, and each digital to analog converter ADC and baseband processor 101 are joined.
In the utility model, the radio-frequency front-end transceiver that provides for the utility model, it can include the identical receiver 1021 of two line structures, indicate variation (Diversity) sign above it, be special in realizing the standard-required of LTE, utilize variation, multichannel to improve data transfer rate and sensitivity.
Need to prove that for receiver 1021 parts, the first module wherein 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 amplifier module (Variable 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 used for according to receiving channels information, adjusts the filter center frequency, and the filtering band disturbs outward, and the frequency mixer after the protection is operated in its linearity scope.Power detector (Power Detector) is used for the filtered signal power size of perception, for baseband processor provides signal power information receiver is set.Frequency mixer Mixer is used for 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).It is digital signal that digital to analog converter ADC is used for analog signal conversion, processes to offer digital baseband processor (Baseband, BB).
For frequency synthesizer (Synthesizer) 1022, it includes and receives local oscillator generator (RX LO GEN), described reception local oscillator generator respectively sending and receiving is penetrated two mixer combination in local oscillator generator (TX LO GEN), divider, multi-modulus frequency divider MMD and the described receiver 1021, and described multi-modulus frequency divider MMD meets respectively four digital to analog converter ADC in the described receiver 1021;
In addition, described divider meets voltage controlled oscillator VCO, loop filter (LF) and phase discriminator and voltage pump concatenation module (PFD/CP successively, be about to the module that voltage pump CP and phase discriminator PFD are cascaded), described phase discriminator and voltage pump concatenation module connect respectively a Numerically Controlled Oscillator and multi-modulus frequency divider (/N), described multi-modulus frequency divider meets respectively described divider and a modulator DSM; Described voltage controlled oscillator VCO is also joined with an automatic frequency controller AFC.
Need to prove, for frequency synthesizer (Synthesizer) 1022, (the Digital Controlled Crystal Oscillator of Numerically Controlled Oscillator wherein, DCXO, be digital control crystal oscillator) the outer crystal oscillator of the comparatively accurate sheet of utilization, oscillating circuit is combined and is produced accurate 26MHz frequency signal as the reference source of frequency synthesizer in sheet, voltage controlled oscillator (Voltage Controlled Oscillator, VCO) after the frequency signal that produces removes 2 through analog divider, pass through again multi-modulus frequency divider (Multi-Modules Divider, MMD) formed the 26MHz frequency signal, 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 VCO, thus the accurate frequency signal of stable output.In addition, assorted the disturbing of introducing for suppressing multi-modulus frequency divider MMD, between voltage pump CP and voltage controlled oscillator VCO, add loop filter (Loop Filter, LF) and automatic frequency control (Automatic Frequency Control, AFC), realize the frequency of voltage controlled oscillator VCO before locking carried out coarse adjustment.Modulator (Delta-Sigma Modulator, DSM) is used for introducing modulation signal by adjusting the frequency division multiple of multi-modulus frequency divider MMD.For the direct modulating mode of the frequency synthesizer of the modulation system (being GMSK) of GSM uses.
For described transmitter 1023, it includes four digital to analog converter combinations, each digital to analog converter combination includes a frequency mixer and a radio frequency digital to analog converter RFDAC, described frequency mixer and radio frequency digital to analog converter RFDAC join (such as Fig. 4, shown in Figure 8), wherein, frequency mixer in the combination of two digital to analog converters is B34 and 39 with the wave band of same low band transformer 100(low frequency) join, and radio frequency digital to analog converter RFDAC and the emission local oscillator generator in described frequency synthesizer 1022 (TX LO GEN) of two digital to analog converters in making up joins; Frequency mixer in two other digital to analog converter combination and the wave band of same high band transformer 200(high frequency are B38 and B40) join, and radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer 1022 (TX LO GEN) in the digital to analog converter combination join.
Referring to Fig. 4, described low band transformer 200 and a low frequency signal output TX_LB join, described high band transformer 200 joins with a high-frequency signal output TX_HB respectively, and described low frequency signal output TX_LB and high-frequency signal output TX_HB join with a transmitting terminal power amplifier PA 103 respectively.
In addition, the digital to analog converter that the digital to analog converter combination that described low band transformer 100 is connected is connected with described high band transformer makes up both and joins by first a channel I and described baseband processor 101, and the another one digital to analog converter that the another one digital to analog converter combination that described low band transformer is connected is connected with described high band transformer makes up both and joins by a second channel Q and described baseband processor 101.
Need to prove, for transmitter 1023, it is divided into high band (TX_HB) and low band (TX_LB) according to output frequency, carry out signal output from high-frequency signal output TX_HB and low frequency signal output TX_LB respectively, high band covering frequence wave band is from 1880MHz to 2025MHz, low band covering frequence wave band is from 2300MHz to 2620MHz, and is corresponding for obtaining best peak value, and corresponding high band transformer 200 and low band transformer 100 are arranged respectively.The quadrature I output of high band and Q output are cancelled image signal in the 200 places 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 are that 1880MHz is to 2025MHz, the local oscillator quadrature I of high band and Q frequency input signal be 23000MHz to 2620MHz, high band and low band part is accepted respectively the positive input signal TXI and the TXQ that are come by baseband processor BBIC.RFDAC is radio frequency digital to analog converter, and the back has a detailed description.
Need to prove, the radio-frequency front-end transceiver that a kind of many standards portable terminal that provides for the utility model has, it has following technique effect:
1, has the function that multi-band signal was inputted and can be accepted to single-ended signal.For the utility model, compared with prior art, owing to there is not the SAW (Surface Acoustic Wave) filter of front end, the front end transconductance stage (Gm) of low noise amplifier LNA 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 can be 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 amplifier VGA is used for guaranteeing the dynamic range of receiver.
Radio Frequency Tracking filter of the present utility model is positioned at the output of low noise amplifier LNA, 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.Simultaneously in conjunction with duty ratio 25% local oscillator signals, passive frequency mixer and intermediate frequency filtering afterwards, integral body reaches the 20MHz out of band signal inhibition ability of 20dBc, can reach the system index requirement.
Fig. 5 is the block diagram of Radio Frequency Tracking filter correction, referring to Fig. 5, for the Radio Frequency Tracking filter in the receiver (Receiver) 1021, front-end module wherein (being specially low noise amplifier LNA) is programmed for oscillator by increasing the negative transconductance value, after the signal mixing of oscillator frequency and frequency synthesizer, export again the baseband intermediate frequency signal, detect frequency by baseband circuit, then set the Radio Frequency Tracking 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 Tracking filter Q value was the highest.
For the Radio Frequency Tracking filter, whole trimming process is: at first the LNA input is disconnected from antenna, by increasing negative transconductance filter is programmed for oscillator, then local oscillator is programmed for the centre frequency of desired frequency band, and detect the starting of oscillation of oscillator by the medium frequency output end DC direct current biasing of frequency mixer, by reducing the negative transconductance value, until the front end vibration disappears, record negative transconductance value arranges, and increases a fixing negative transconductance value and surplus is set guarantees that the front end amplification filtering is stable.This moment, the Q value was best.
2, only need to use a frequency synthesizer.For the utility model, because TD-LTE and TD-SCDMA are the systems of time division duplex (TDD), therefore reception and emission can be carried out in timesharing (not simultaneously), so the receiver in the radio-frequency front-end transceiver and reflector can use same frequency synthesizer, therefore, compare with the radio-frequency front-end transceiver of existing bifrequency compositor system, the radio-frequency front-end transceiver that the utility model provides can greatly reduce the complexity of system, simultaneously owing to reduce the production cost of chip area and reduction transponder chip.
3, reflector of the present utility model can be realized binary channel output.Referring to shown in Figure 3, in order to improve output spectrum degree of purity, efficient and the linearity of transmitter in the radio-frequency front-end transceiver of the present utility model, the signal of transmitter of the present utility model is divided into independent high and low frequency two-way output, and the wave band of high frequency is B38 and B40, and the wave band of low frequency is B34 and 39.As a same reason, for the utility model, the RFDAC in the radio-frequency front-end transponder chip and transformation and single both-end transducer also are divided into independent high and low frequency path, in order to optimize separately.
Referring to Fig. 6, on the specific implementation, transmitter in the radio-frequency front-end transceiver of the present utility model can also be as shown in Figure 6 structure, compare with transmitter 1023 shown in Figure 4, described transmitter is the linear transmitter of IQ quadrature, include equally four digital to analog converter combinations, radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the low band transformer also joins by the emission local oscillator generator in a divider and the described frequency synthesizer 1022 (TX LO GEN), radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the high band transformer equally, also joins by the emission local oscillator generator in a divider and the described frequency synthesizer 1022 (TX LO GEN).In addition, frequency mixer in two described digital to analog converters combinations of joining with the low band transformer by a path with launch local oscillator generator (TX LO GEN) and join, and, the frequency mixer in two described digital to analog converters combinations of joining with the high band transformer also by a path with launch local oscillator generator (TX LO GEN) and join.
On the specific implementation, referring to Fig. 6, the utility model is according to the radio spectrum scope of TD-SCDMA and TD-LTE, and the radio-frequency front-end transceiver is divided into the high and low frequency two-way, and high frequency covers the 2300-2620MHz wave band, and low frequency covers the 1880-2025MHz wave band.Low frequency part and HFS respectively comprise again I passage and Q passage, the I passage is accepted the I signal TXI by the baseband portion transmission, and the I local oscillation signal (LO_LB_I and LO_HB_I) that is produced by frequency synthesizer (Freq Synthesizer) and local oscillator generator (LO Gen), HFS produces differential output signal RF_HB_I_P and RF_HB_I_N, and low frequency part produces differential output signal RF_LB_I_P and RF_LB_I_N.
The Q passage is accepted the TXQ signal TXQ by the baseband portion transmission, and the Q local oscillation signal (LO_LB_Q and LO_HB_Q) that is produced by frequency synthesizer (Synthesizer) and local oscillator generator (LO Gen), HFS produces differential output signal RF_HB_Q_P and RF_HB_Q_N, and low frequency part produces differential output signal RF_LB_Q_P and RF_LB_Q_N.
For transmitter shown in Figure 6, the signal of the I of HFS and low frequency part and Q passage is in transformer (low band transformer and the high band transformer) addition of deferent segment, elimination local oscillation signal and the image signal that is produced by mixing.By transformer output single-pole signal TX_HB and TX_LB.The LO_HB/2 of the fractional frequency signal behind the signal process divider that local oscillator generator produces and LO_LB/2 deliver the sample frequency as two frequency range RF-DAC.
Need to prove, in view of in transmitter, the harmonic wave that the digital to analog converter DAC that has can produce quantizing noise and sample frequency fs repeats frequency spectrum (frequency spectrum of 2fs and 3fs frequency), and solution before is to increase a low pass filter LPF by the back at radio frequency digital to analog converter RFDAC to come the filtering harmonic wave to repeat frequency spectrum.Fig. 7 carries out the schematic diagram that the filtering harmonic wave repeats frequency spectrum processing for logarithmic mode transducer in existing traditional linear transmitter.
To shown in Figure 11, existing filtering radio frequency digital to analog converter RFDAC harmonic wave repeats structure chart and the oscillogram of frequency spectrum referring to Fig. 8.Because digital to analog converter DAC can produce the harmonic wave of quantizing noise and sample frequency fs and repeat frequency spectrum, such as 2 fs, 3fs etc., such as Fig. 8, come the filtering harmonic wave to repeat frequency spectrum so must add in the DAC back low pass filter, this moment, low pass filter was called again reconstruction (reconstruction) filter.Filter transfer function is referring to Fig. 9, at first need the low pass filter elimination to repeat frequency spectrum by the high frequency that the harmonic wave of digital to analog converter sampled signal frequency brings, Figure 10 is the output spectrum figure of low pass filter, then through the overcurrent frequency mixer signal is modulated to carrier frequency, Figure 11 is the spectrogram after the mixing, through behind the power amplifier driver of voltage mode, differential signal is transferred to single-ended signal output.
Repeat the structure of frequency spectrum for existing filtering digital to analog converter DAC harmonic wave, because the current type DAC of front end is output as current signal, the current type frequency mixer input of rear end also is current signal, and the low pass filter of high-order is generally voltage domain, so needing voltage transitions electric current (V to I) interface module and current conversion voltage (I to V) interface module changes, by frequency mixer signal is transformed into high-frequency local oscillation frequency f LO again after the filtering, then amplifies output through power amplifier driver (PAD).Therefore, existing scheme owing to be low frequency, so the chip area that takies is large, and owing to LPF, two interface modules all can be introduced thermal noise and 1/f noise, needs larger power consumption to satisfy the noiseproof feature of chip owing to need low pass filter LPF.In addition, because through the conversion of several times electric current and voltage, by the electric current input of digital to analog converter, transfer the input of low pass filter voltage to, and then transfer the electric current input of frequency mixer to, and transferring again the electric current input of power amplifier driver at last to, several times conversion is unfavorable for system linear degree and power consumption.
For the harmonic wave that solves above-mentioned existing filtering radio frequency digital to analog converter RFDAC repeats spectrum issue, the utility model can no longer be introduced low pass filter LPF, referring to Figure 12 to Figure 14 and Fig. 4, Fig. 6, but 1/2nd frequencies of directly using local frequency fLO are used as the sample frequency fs of radio frequency digital to analog converter RFDAC, the radio frequency digital to analog converter RFDAC sample frequency fs(of such two frequencys multiplication namely equals fLO) as output signal, must filtering, output after can directly superposeing with transmitter output signal, strengthened output signal power, output spectrum figure as shown in figure 13.In addition, for the repetition frequency spectrum more than the frequency tripling, because frequency is very high, can be by the selectivity effective attenuation of the radio freqnency transformer of output and filtering, system does not need low pass filter like this, does not need the conversion interface module of current/voltage yet, and output spectrum figure as shown in figure 14.Simultaneously owing to adopt the digital unit design, multiunit weighting can the outer power amplifier of driving chip, so this system does not need the PAD module.Therefore, the utility model is optimized setting by the sample frequency to radio frequency digital to analog converter in the transmitter in the radio frequency front-end transceiver, has further improved the intensity of transmitter institute output signal in the radio-frequency front-end transceiver, has promoted the overall performance of portable terminal.
In addition, in the utility model, referring to table 2, table 2 is in a kind of many standards portable terminal that provides for the utility model, the signal table of the out-of-band noise index of each mobile communication standard and the out-put dynamic range of radio frequency digital to analog converter DAC, number of significant digit;
Table 2:
Referring to table 2, for the impact on system's out-of-band noise index of the quantizing noise that solves radio frequency digital to analog converter RFDAC, the dynamic range of radio frequency digital to analog converter RFDAC and number of significant digit (ENOB) will be determined according to the noise requirements of various criterion.
；
Wherein, BW is the signal bandwidth of wireless standard, and dBc/Hz is the out-of-band noise index request of this standard.Table 1 listed each mobile communication standard the out-of-band noise index and dynamic range and number of significant digit (ENOB).
Need to prove, for TD-LTE and TD-SCDMA standard, ENOB is 14, can satisfy index request, according to prior art, 14 DAC is feasible, adopt 5 bit linear coding, 5 binary codings are in conjunction with the height over-sampling, can obtain whole number of significant digit and be 14 precision, and satisfying the out-of-band noise that quantizing noise brings affects performance index.
Based on the radio frequency digital to analog converter of transmitter and the catenation principle of frequency mixer in the radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter shown in Figure 12, on the specific implementation, referring to Figure 15, in a kind of radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter that Figure 15 provides for the utility model, the physical circuit connection diagram of radio frequency digital to analog converter and frequency mixer Mixer in the linear transmitter.As shown in figure 15, the top of Figure 15 is the frequency mixer that is driven by difference local oscillation signal (Lon and Lop signal), the bottom is that sample frequency is that ClockIN(equals fLO/2) radio frequency digital to analog converter RFDAC, be current-mode all, do not have conversion interface circuit and low pass filter blocks.
Referring to Figure 15, described radio frequency digital to analog converter RFDAC includes d type flip flop DFF, the grid G of described d type flip flop DFF and two N-type MOS switching tube NMOS1 and NMOS2 is joined, the drain D of described NMOS1 and NMOS2 switching tube is joined with described frequency mixer respectively, the source S of described NMOS1 and NMOS2 switching tube drain D common and a N-type MOS switching tube NMOS3 is joined, the grid G of described switching tube NMOS3 respectively with the grid G of a switching tube NMOS4, drain D is joined, the source S ground connection of described switching tube NMOS4 and NMOS3, the drain D of described switching tube NMOS4 meet a direct current biasing control signal Bias_ctrl successively, a supply power voltage V
DD(1.2V or 2.5V).
Need to prove that Bias_ctrl is the direct current biasing control signal, this control signal is provided by baseband processor BBIC, baseband processor is according to processing procedure, voltage and temperature regime are adjusted the size of direct current biasing, to guarantee the linearity, noiseproof feature and the lowest power consumption of signal.
In the lump referring to Figure 16, Figure 16 is RFDAC unit oscillogram, the clock of the signal DataIN that is transmitted by baseband processor (BBIC) part is ClockBB, this clock must with RFDAC sample frequency (being sample frequency fs) clock ClockIN Phase synchronization, RFDAC is at the rising edge locking data of ClockIN, at the trailing edge output difference divided data DataO_Q of Clock and DataO_Qb to the RFDAC current unit.
Referring to Figure 17, in a kind of many standards portable terminal that Figure 17 provides for the utility model in the radio-frequency front-end transceiver, the uniform enconding integrated circuit figure of digital to analog converter RFDAC in the linear transmitter.For digital to analog converter RFDAC, the base-band data signal procession coding that at first baseband processor (BBIC) part is transmitted, encode such as 5 bit linear, altogether be 2 five powers for 32() individual unit, requirement according to coupling, be designed to 4 row, 8 row, there is different data input signal connecting line separately each unit, the sampling clock ClockIN of all digital to analog converter RFDAC unit links together, local oscillation signal LOn and the LOp of all unit link together, and the output of all unit all merges weighting and generates whole differential output signal OUTp and OUTn.Therefore, the gain of transmitter can come Digital Control by base band (baseband) part fully.
Therefore, the transmitter in the radio-frequency front-end transceiver that provides for the utility model, it does not need low pass filter, can reduce chip area, reduces production costs.Simultaneously, the sampling mirror image of baseband signal can be used as the output signal of transmitter, has increased the signal strength signal intensity of output, the power consumption that improved Efficiency Decreasing.In addition, system simplification has improved many standards, and the feasibility of multi-band transceiver has realized that Design of digital and gain control are more accurate.
In sum, compared with prior art, the portable terminal that is applicable to the various kinds of mobile communication standard that the utility model provides and have the radio-frequency front-end of radio frequency digital-to-analogue conversion formula linear transmitter, this portable terminal is by the integrated Radio Frequency Tracking filter that arranges in the radio-frequency front-end transceiver, come external signal is selected according to the difference that this terminal signaling receives frequency range by the Radio Frequency Tracking filter, thereby can not need at the input of radio-frequency front-end transceiver inner receiver a plurality of SAW (Surface Acoustic Wave) filter quantity be set, reduce simultaneously the signal input part quantity of radio-frequency front-end transceiver inner receiver, the area that therefore can significantly reduce the production cost of portable terminal and reduce the whole chip of portable terminal, thereby therefore the market competitiveness of lifting mobile terminal is of great practical significance.
In addition, the utility model also is optimized setting by the proportion to radio frequency digital to analog converter in the transmitter in the radio frequency front-end transceiver, further improve the intensity of transmitter institute output signal in the radio-frequency front-end transceiver, promoted the overall performance of portable terminal.
The above only is preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (12)
1. standard portable terminal more than a kind is characterized in that, includes a baseband processor, a radio-frequency front-end transceiver, two transmitting terminal power amplifiers and a radio-frequency (RF) switch;
Described radio-frequency (RF) switch is connected with an antenna;
Described radio-frequency front-end transceiver is connected with baseband processor, an antenna respectively, be used for the external signal by a plurality of wave bands of antenna reception, and receive the difference of frequency range according to external signal, and external signal is selected, then selected signal is transmitted to the transmitting terminal power amplifier;
Each transmitting terminal power amplifier is connected with the radio-frequency front-end transceiver, is used for received signal is amplified processing, then sends antenna to by described radio-frequency (RF) switch, carries out the signal emission by antenna.
2. many standards portable terminal as claimed in claim 1, it is characterized in that, described radio-frequency front-end transceiver RFIC includes a receiver, a frequency synthesizer and a transmitter, and the front end of described receiver is provided with one or more Radio Frequency Tracking filter.
3. many standards portable terminal as claimed in claim 2 is characterized in that, described receiver includes two low noise amplifier LNA, and the end of described two low noise amplifier LNA joins with a signal input part RXIN respectively;
The other end of described two low noise amplifier LNA joins with a variable gain amplifier VGA respectively, the mixer combination that each described variable gain amplifier VGA connects respectively a Radio Frequency Tracking filter and is comprised of two frequency mixer Mixer, and be connected with a power detector between two described variable gain amplifier VGA;
Each described mixer combination and variable-gain intermediate frequency are amplified and low pass filter PGA/LPF joins, and each variable-gain intermediate frequency amplification and low pass filter join with two digital to analog converter ADC respectively, and each digital to analog converter ADC and baseband processor are joined.
4. many standards portable terminal as claimed in claim 3, it is characterized in that, described frequency synthesizer includes and receives the local oscillator generator, and described reception local oscillator generator respectively sending and receiving is penetrated two mixer combination in local oscillator generator, divider, multi-modulus frequency divider MMD and the described receiver;
Described divider meets voltage controlled oscillator VCO, loop filter LF and phase discriminator and voltage pump concatenation module PFD/CP successively, described phase discriminator and voltage pump concatenation module connect respectively a Numerically Controlled Oscillator and a multi-modulus frequency divider, described multi-modulus frequency divider meets respectively described divider and a modulator DSM, and described voltage controlled oscillator VCO is also joined with an automatic frequency controller AFC.
5. many standards portable terminal as claimed in claim 4, it is characterized in that, described transmitter includes four digital to analog converter combinations, and each digital to analog converter combination includes a frequency mixer and a radio frequency digital to analog converter RFDAC, and described frequency mixer and radio frequency digital to analog converter RFDAC join;
Wherein frequency mixer and the same low band transformer in the combination of two digital to analog converters joins, and two digital to analog converters in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join; Frequency mixer and same high band transformer in the combination of two other digital to analog converter join, and digital to analog converter in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join.
6. many standards portable terminal as claimed in claim 5, it is characterized in that, radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the low band transformer also joins by the emission local oscillator generator in a divider and the described frequency synthesizer, and the radio frequency digital to analog converter RFDAC during two described digital to analog converters that join with the high band transformer make up also joins by the emission local oscillator generator in a divider and the described frequency synthesizer;
Frequency mixer in two described digital to analog converters combinations of joining with the low band transformer joins with emission local oscillator generator, and the frequency mixer in two described digital to analog converters combinations of joining with the high band transformer also joins with emission local oscillator generator.
7. such as claim 5 or 6 described many standards portable terminals, it is characterized in that the sample frequency fs of described radio frequency digital to analog converter RFDAC equals 1/2nd of local frequency fLO.
8. the radio-frequency front-end transceiver with radio frequency digital-to-analogue conversion formula linear transmitter is characterized in that, includes a receiver, a frequency synthesizer and a transmitter, and the front end of described receiver is provided with one or more Radio Frequency Tracking filter.
9. radio-frequency front-end transceiver as claimed in claim 8 is characterized in that, described receiver includes two low noise amplifier LNA, and the end of described two low noise amplifier LNA joins with a signal input part RXIN respectively;
The other end of described two low noise amplifier LNA joins with a variable gain amplifier VGA respectively, the mixer combination that each described variable gain amplifier VGA connects respectively a Radio Frequency Tracking filter and is comprised of two frequency mixer Mixer, and be connected with a power detector between two described variable gain amplifier VGA;
Each described mixer combination and variable-gain intermediate frequency are amplified and low pass filter PGA/LPF joins, and each variable-gain intermediate frequency amplification and low pass filter join with two digital to analog converter ADC respectively, and each digital to analog converter ADC and baseband processor are joined;
Described frequency synthesizer includes and receives the local oscillator generator, and described reception local oscillator generator respectively sending and receiving is penetrated two mixer combination in local oscillator generator, divider, multi-modulus frequency divider MMD and the described receiver;
Described divider meets voltage controlled oscillator VCO, loop filter LF and voltage pump formula phase discriminator PFD/CP successively, described voltage pump formula phase discriminator connects respectively a Numerically Controlled Oscillator and a multi-modulus frequency divider, described multi-modulus frequency divider meets respectively described divider and a modulator DSM, and described voltage controlled oscillator VCO is also joined with an automatic frequency controller AFC;
Described transmitter includes four digital to analog converter combinations, and each digital to analog converter combination includes a frequency mixer and a radio frequency digital to analog converter RFDAC, and described frequency mixer and radio frequency digital to analog converter RFDAC join;
Wherein frequency mixer and the same low band transformer in the combination of two digital to analog converters joins, and two digital to analog converters in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join; Frequency mixer and same high band transformer in the combination of two other digital to analog converter join, and digital to analog converter in making up radio frequency digital to analog converter RFDAC and the emission local oscillator generator in the described frequency synthesizer join.
10. radio-frequency front-end transceiver as claimed in claim 9, it is characterized in that, radio frequency digital to analog converter RFDAC in two described digital to analog converters combinations of joining with the low band transformer also joins by the emission local oscillator generator in a divider and the described frequency synthesizer, and the radio frequency digital to analog converter RFDAC during two described digital to analog converters that join with the high band transformer make up also joins by the emission local oscillator generator in a divider and the described frequency synthesizer;
Frequency mixer in two described digital to analog converters combinations of joining with the low band transformer joins with emission local oscillator generator, and the frequency mixer in two described digital to analog converters combinations of joining with the high band transformer also joins with emission local oscillator generator.
11. such as claim 9 or 10 described radio-frequency front-end transceivers, it is characterized in that the sample frequency fs of described radio frequency digital to analog converter RFDAC equals 1/2nd of local frequency fLO.
12. such as claim 9 or 10 described radio-frequency front-end transceivers, it is characterized in that, described radio frequency digital to analog converter RFDAC includes d type flip flop DFF, the grid G of described d type flip flop DFF and two N-type MOS switching tube NMOS1 and NMOS2 is joined, the drain D of described NMOS1 and NMOS2 switching tube is joined with described frequency mixer respectively, the source S of described NMOS1 and NMOS2 switching tube drain D common and a N-type MOS switching tube NMOS3 is joined, the grid G of described switching tube NMOS3 respectively with the grid G of a switching tube NMOS4, drain D is joined, the source S ground connection of described switching tube NMOS4 and NMOS3, the drain D of described switching tube NMOS4 meet a direct current biasing control signal Bias_ctrl successively, a supply power voltage V
DD
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| CN2012202223778U CN202818280U (en) | 2012-05-17 | 2012-05-17 | Mobile terminal and radio frequency front end thereof with radio frequency digital-to-analogue conversion type linear transmitter |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664653A (en) * | 2012-05-17 | 2012-09-12 | 天津里外科技有限公司 | Mobile terminal and radio frequency front terminal thereof with radio frequency digital-to-analog conversion type linear transmitter |
| CN105471467A (en) * | 2016-01-07 | 2016-04-06 | 北京邮电大学 | Reconfigurable radio frequency front end device supporting channel sharing |
| CN105510937A (en) * | 2015-11-27 | 2016-04-20 | 武汉梦芯科技有限公司 | Multi-mode multi-frequency baseband chip pin control circuit and control method |
| CN106788486A (en) * | 2016-12-02 | 2017-05-31 | 华南理工大学 | A kind of emitter and its temperature compensation with temperature-compensating |
| CN109067443A (en) * | 2018-09-07 | 2018-12-21 | 东南大学 | A kind of extensive MIMO communication system of miniaturization 5G |
| CN110907898A (en) * | 2018-09-18 | 2020-03-24 | 天津大学青岛海洋技术研究院 | Doppler radar circuit structure for restraining direct current bias by utilizing radio frequency switch |
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2012
- 2012-05-17 CN CN2012202223778U patent/CN202818280U/en not_active Withdrawn - After Issue
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102664653A (en) * | 2012-05-17 | 2012-09-12 | 天津里外科技有限公司 | Mobile terminal and radio frequency front terminal thereof with radio frequency digital-to-analog conversion type linear transmitter |
| CN102664653B (en) * | 2012-05-17 | 2014-09-03 | 天津里外科技有限公司 | Mobile terminal and radio frequency front terminal thereof with radio frequency digital-to-analog conversion type linear transmitter |
| CN105510937A (en) * | 2015-11-27 | 2016-04-20 | 武汉梦芯科技有限公司 | Multi-mode multi-frequency baseband chip pin control circuit and control method |
| CN105510937B (en) * | 2015-11-27 | 2017-09-19 | 武汉梦芯科技有限公司 | A kind of multimode multi-frequency baseband chip pin control circuit and control method |
| CN105471467A (en) * | 2016-01-07 | 2016-04-06 | 北京邮电大学 | Reconfigurable radio frequency front end device supporting channel sharing |
| CN105471467B (en) * | 2016-01-07 | 2018-08-17 | 北京邮电大学 | A kind of restructural radio frequency front-end device for supporting channels share |
| CN106788486A (en) * | 2016-12-02 | 2017-05-31 | 华南理工大学 | A kind of emitter and its temperature compensation with temperature-compensating |
| CN109067443A (en) * | 2018-09-07 | 2018-12-21 | 东南大学 | A kind of extensive MIMO communication system of miniaturization 5G |
| CN110907898A (en) * | 2018-09-18 | 2020-03-24 | 天津大学青岛海洋技术研究院 | Doppler radar circuit structure for restraining direct current bias by utilizing radio frequency switch |
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