CN102386869A - Analog/digital configurable variable-gain amplifier - Google Patents
Analog/digital configurable variable-gain amplifier Download PDFInfo
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- CN102386869A CN102386869A CN2010102689896A CN201010268989A CN102386869A CN 102386869 A CN102386869 A CN 102386869A CN 2010102689896 A CN2010102689896 A CN 2010102689896A CN 201010268989 A CN201010268989 A CN 201010268989A CN 102386869 A CN102386869 A CN 102386869A
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Abstract
The invention discloses an analog/digital configurable variable-gain amplifier, which comprises a variable-gain amplifier module VGA and an analog/digital configurable control circuit. The variable-gain amplifier module is formed by a plurality of variable-gain amplifiers and a fixed-gain amplifier in concatenation connection. The analog/digital configurable control circuit comprises an analog mode control circuit and a digital mode control circuit. A comparator and a charge pump of the analog mode control circuit detect the size of amplitude of an output signal, output an appropriate control voltage and feed back the control voltage to the VGA so as to regulate the gain of the VGA. The digital mode control circuit controls an internal switch circuit by means of an external signal, generates the control voltage by means of a decoder and an I-V converter according to an input signal provided by a digital baseband processing module chip and feeds back the control voltage to the VGA so as to change the gain of the VGA. The analog/digital configurable variable-gain amplifier can flexibly switch between an analog mode and a digital mode and is especially suitable for a radio-frequency front end circuit for different baseband chips.
Description
Summary of the invention
The invention belongs to the technology for radio frequency field; Relate to a kind of variable gain amplifier; Relate in particular to the configurable variable amplifier of a kind of analog/digital, be used for radio-frequency transmitter, it both can work in simulation Control work pattern; Can work in digital control pattern again, the switching of two kinds of patterns realizes through the control signal of outside.
Summary of the invention
The objective of the invention is for solving the above problem that the traditional radio frequency receiver front end of prior art constitutes; A kind of variable gain amplifier is provided; The novel gain controllable amplifier circuit that simulation model and figure pattern are integrated, the radio-frequency transmitter and other that can be used for multi-frequency multi-mode need carry out in the receiver of different processing and amplifying signal.It removes the function of the variable gain amplifier that possesses traditional receiver, also has the function of the changeable control of digital-to-analog, can better reduce hardware and system power expense, improves system signal noise ratio, optimization system design.
The present invention combines analogue variable gain amplifier and digital variable gain amplifier, on the basis that utilizes hardware resource to greatest extent, amplifies with the small-signal of dual mode with front end; Supply with the AD sampling, offer different baseband chips and handle, thereby make this radio frequency chip to work in coordination with dissimilar baseband chips; Saved outer member; Reduce circuit overhead and power consumption, improved the performance of system, and the sensitivity of radio-frequency transmitter etc.; Can also reduce equipment power dissipation and volume thus, practice thrift cost.Of the present inventionly a kind ofly configurablely applicable to the radio frequency chip of multimode multifrequency, different baseband processing chips have been particularly suitable in digital control and variable gain amplifier analog control mode, the workplace that need cooperate with different type chip.
Above-mentioned purpose of the present invention is to realize through following technical scheme:
The configurable variable gain amplifier of a kind of analog/digital; It is characterized in that: configurable variable gain amplifier is a programmable-gain module in the radio-frequency front-end; Its input inserts the radio-frequency front-end intermediate-freuqncy signal; Its output connects next stage digital baseband process chip, and its external interface has a pattern control port and a gain digital Control and Feedback port;
Said pattern control port connects the radio-frequency transmitter control signal, is used for the control model switching part, selects gain control mode;
Said gain digital Control and Feedback port connects the feedback signal port of next stage digital baseband process chip.
The configurable variable gain amplifier of described a kind of analog/digital, its composition that is said programmable-gain module comprises
Variable gain amplifier,
Simulation model anti-Kui rotation road,
Figure pattern anti-Kui rotation road,
The mode switch circuit,
The V-I transducer, and
Analog to digital converter is right; Wherein
Said variable gain amplifier is that the variable gain of an analog/digital mode common is amplified path;
The pattern control port of said mode switch circuit connects the radio-frequency transmitter control signal; The mode switch circuit is with anti-rotation road and the anti-rotation road of presenting of figure pattern of presenting of selection mode connection mode simulation models, and simulation model is counter presents rotation road and variable gain and amplify path and form analog gain control model circuit; Variable gain amplifies path and digital gain control model circuit is formed on figure pattern anti-Kui rotation road;
Said V-I transducer has one two input or door;
Said analog to digital converter is right to being the 2bit analog to digital converter, and the analog signal conversion of respectively the two-way radio-frequency differential gain of variable gain amplifier output being amplified is a digital signal, delivers to the input of digital baseband processing module.
Analog to digital converter with the two-way differential gain amplifying signal of programmable-gain module output receive the digital baseband processing module two inputs, offer the next stage baseband processing chip and carry out base band signal process; The output of digital baseband processing module, the input on linking number word pattern anti-Kui rotation road; Two outputs of fixed gain level circuit are the input on connection mode simulation models anti-Kui rotation road also.
The configurable variable gain amplifier of described a kind of analog/digital, it is that said variable gain amplifier comprises several variable gain amplifying stages and a fixed gain level; Wherein
The differential configuration circuit of several variable gain amplifying stages; Be connected in series successively; Two inputs of first order variable gain amplifying stage connect radio-frequency front-end two-way differential input signal, and two difference output ends of final stage variable gain amplifying stage connect two differential input ends of fixed gain level;
Two difference output end correspondences of fixed gain level circuit are connected to the differential input end on simulation model anti-Kui rotation road, and the right input of analog to digital converter also is connected in parallel.
The configurable variable gain amplifier of described a kind of analog/digital; It is anti-rotation route comparator pair and charge pump formations that be connected in series of presenting of said simulation model, and this simulation model is counter presents the individual range detector that is used to detect the difference output amplitude of variable gain amplifier of rotation Lu Weiyi; Wherein
The corresponding differential amplitude output that connects variable gain amplifier of the right input of comparator, the right comparison termination of comparator is gone into reference voltage Vref, the be connected in parallel input of charge pump of two right outputs of comparator;
Charge pump is simulation control charge pump, and its output is the output of range detector, connects an input of V-I change-over circuit.
Comparator is to comparing output amplitude to be detected with reference voltage Vref; Comparator output is transformed into analog voltage signal through charge pump; And convert the gain controlling current signal to through the V-I change-over circuit, feed back to the variable gain amplifying stage, the control amplifier's gain; Guarantee the stable of gain-changeable amplifier circuit output amplitude, so that sampled signal amplitude accurately is provided for the ADC analog to digital converter.
The configurable variable gain amplifier of described a kind of analog/digital, it is that said digital control pattern anti-Kui rotation road comprises mode switch circuit and the DAC digital to analog converter that is connected in series with mode switch circuit one end; Wherein
The mode switch circuit is digital switching controls parts; It comprises electronic switch and switch-over control signal end; The electronic switch of commutation circuit receives the control from the receiver control signal; Realize the switching of control model, make the programmable-gain module work in numerically controlled PGA pattern and perhaps work in the simulation agc mode;
The input of DAC converter connects the feedback signal terminal of digital baseband processing module, and the output of DAC digital to analog converter connects another input of V-I change-over circuit, and the V-I change-over circuit becomes the gain controlling electric current with the output conversion of signals of DAC digital to analog converter.
The switching of commutation circuit realizes control by a control signal from the outside, and the main amplifier circuit of this switching simultaneously can not change, and needn't increase additional hardware and satisfy two kinds of mode of operations.Under analog control scheme, the signal path of digital control part is cut off; When digital control pattern, the signal path of simulation control part is cut off, thus gain-changeable amplifier circuit when the work of a kind of control model, another kind of control model can not exert an influence to it.
The configurable variable gain amplifier of described a kind of analog/digital, it is that said analog gain control model circuit and digital gain control model circuit also comprise the I-V change-over circuit; The output on analog control scheme anti-Kui rotation road and digital control pattern anti-Kui rotation road; Select to connect the I-V change-over circuit; I-V change-over circuit output connects some variable gain stage gain control ends with the gain controlling electric current that converts to, controls the gain of each variable gain amplifying stage;
Said analog gain control model circuit and digital gain control model circuit are anti-indicial response circuit; Can make amplifier gain with control voltage dB-linear linear change; Gain control signal output connects the gain control end of each variable gain stages circuit, and the control variable gain amplifier is to the undistorted amplification of input signal.
The configurable variable gain amplifier of described a kind of analog/digital; Its DAC transducer that is said digital control pattern anti-Kui rotation road is the current-mode DAC circuit of 5bit, and the reference voltage input terminal of DAC transducer connects the reference voltage V ref that the programmable-gain module provides; Under the digital controlled signal that comes portion's receiver cooperates, select digital control pattern anti-Kui rotation road to work in the digital variable gain control mode, the output of DAC transducer provides the I-V change-over circuit to form the gain controlling electric current.
The DAC circuit has adopted the current-mode DAC form circuit of 5bit; With digital baseband process chip feedback signal is input; With the LDO circuit in the programmable-gain modular circuit reference voltage being provided is the reference voltage of DAC transducer; Can guarantee that the value of controlling voltage does not receive supply voltage and technogenic influence, thereby guarantee that DAC provides the accuracy of control voltage.The feedback signal of said digital control pattern anti-Kui rotation road input; Be according to radio-frequency front-end ADC transducer output signal by the baseband processing module chip; Through the output that adds up of digital comparator comparison and accumulator; Feed back to digital control pattern anti-Kui rotation road, and under the control of receiver control signal, select digital control pattern, realize amplifier's gain is controlled.The baseband processing module chip is divided into two kinds of mode of operations of analog or digital, and which kind of control Fang Mo receiver selects depend on the mode of operation of the baseband processing module chip that receiver disposes.The baseband chip that radio frequency chip disposed can be selected analog control scheme, and is stable by the automatic ride gain amplifier of radio frequency chip output amplitude.Also can select digital control pattern, come ride gain amplifier output amplitude stable according to ADC transducer output signal through the feedback that relatively adds up by baseband chip.Select the control signal of which kind of control mode to write through receiver three bus initialization by baseband chip.
The configurable variable gain amplifier of described a kind of analog/digital; It is characterized in that: the comparator on said analog control scheme anti-Kui rotation road is to being the circuit structure of output parallel connection; Be used for comparative result with variable gain amplifier two-way difference amplified output signals and reference voltage Vref; Supply with charge pump after the addition to capacitor charge and discharge, the voltage on the electric capacity is converted to the gain controlling electric current through the V-I transducer, guarantees that the variable gain amplifier output voltage amplitude is within controlled area charactert.
After comparator was relatively exported addition to simulation, to capacitor charge and discharge, electric current was through the V-I transducer through charge pump, controlled electric current, and the yield value of control variable-gain amplification circuit guarantees that the variable gain amplifier output voltage amplitude is within the scope of setting.
The configurable variable gain amplifier of described a kind of analog/digital; It is that said variable gain amplifier is the precise gain amplifier; It is the comparison foundation with the reference voltage; The gain controlling electric current that simulation model anti-Kui rotation road and figure pattern anti-Kui rotation road provide is realized the accurate control of accurate control amplifier gain, and the radio-frequency front-end signal of the high-gain and the big range of linearity is provided for the baseband processing module chip of digital operation mode or analog operation pattern.
Said reference voltage Vref is that the reference voltage that the linear voltage regulator LDO circuit by the programmable-gain module provides is a reference voltage.
The requirement of radio-frequency front-end intermediate frequency amplifier; No matter amplifier is operated under the digital control pattern still is operated under the analog control scheme; The high-gain and the big range of linearity can both be provided, and be operated under the digital control pattern accurate step gain can be provided, satisfy the required precision of system.
The configurable variable gain amplifier of described a kind of analog/digital; It is that said variable gain amplifier is the multiplex circuit of the gain amplifier of digital gain control model and analog gain control model, can connect two dissimilar digital baseband processing modules simultaneously;
The variable gain amplifying stage of said variable gain amplifier is the Gilbert cell structural circuit; As preferably, adopt three grades of variable gain amplification grade circuits to be connected in series; The structural circuit of three grades of variable gain amplifying stages is identical, and the gain control end of each variable gain amplifying stage inserts a dynamically bias current of adjustment, is used for accurately adjusting amplifier's gain;
The fixed gain amplifying stage of said variable gain amplifier also is the Gilbert cell structural circuit, and its gain control end inserts a fixing bias current, is used to improve driving force and big output voltage swing.
When the configurable gain-changeable amplifier circuit of analog/digital works under the analog control mode; If input signal VINN and VINP a little less than; The output detection comparator is with output voltage V outn and Voutp and reference voltage V ref comparison; The output voltage V c control charge pump of output detection comparator charges to capacitor, and variable gain amplifier is placed high gain mode work; If input signal V
INNAnd V
INPWhen strong, the output detection comparator is with output voltage V
OUTPAnd V
OUTNCompare with reference voltage V ref, the control charge pump discharges to capacitor, and variable gain amplifier is placed low gain mode work.When from the control signal of receiver with electronic switch closes; When the configurable gain-changeable amplifier circuit of control circuit analog/digital works in digital control pattern; If input signal is more weak; Output is compared AD output Calculation variance and standard variance by baseband chip, the big digital signal of output after comparative result adds up, and digital signal obtains big analog signal through the DAC transducer; Through the I-V change-over circuit output conversion of signals of DAC digital to analog converter is become gain control signal, the control variable gain amplifier places high gain mode work; When input signal is more intense; Output is compared ADC output Calculation variance and standard variance by baseband chip; The little digital signal of output after comparative result adds up; Digital signal obtains little analog signal through DAC, through the I-V change-over circuit output conversion of signals of DAC digital to analog converter is become gain control signal, and the control variable gain amplifier places low gain mode work.See the intermediate frequency amplifying signal V of amplitude stabilization off through A-D converter at the output signal of variable gain amplifier
OUTNAnd V
OUTP
Because digital VGA requires to have bandwidth the same with simulation AGC and gain requirement; Accurate more burning voltage to be arranged simultaneously,, reduce system complexity in order no longer to add unnecessary hardware; Improve the stability of a system; The transducer that has added analog to digital, multiplexing variable gain amplifier has well been realized digital control.Owing to use baseband chip to detect the signal of output, can make full use of the powerful disposal ability of DSP, accomplish complicated more nonlinear algorithm, do not receive the influence of temperature, technology, noise etc., can realize controlling more accurately.Able to programmely make control more flexible; The needed characteristic of the easier realization of ability; But it also exists the digital feedback control signal can cause the noncontinuity of VGA change in gain and the discontinuity of signal phase simultaneously, and the discontinuous variation that gains has limited its purposes.
Different system and baseband chip can select for use above-mentioned any scheme to realize; The present invention proposes an integrated circuit can satisfy above-mentioned a plurality of requirement simultaneously; Especially in the chip miniaturization; Under the increasingly high market background of integrated level; This integrated integral system of simulating controllable intermediate frequency amplifier and digital programmable control intermediate frequency amplifier can well adapt to the multimode multi frequency system and require and only adopt a cover hardware spending, has saved a large amount of areas, makes the hardware multiplexing of system reach maximization.
Substantial effect of the present invention:
1, the configurable variable gain amplifier of digital-to-analog of the present invention can be used with multiple baseband chip, can adapt to the needs of multimode multifrequency receiver and other needs Multiband-multimode work system.
2, the present invention has digital-to-analog control model handoff functionality, and circuit structure makes chip area reduce, and can better reduce hardware and system power expense, improves system signal noise ratio, optimization system design.
3, the transducer of the analog to digital of circuit adding of the present invention, multiplexing variable gain amplifier can well be realized digital control.
4, circuit digital control model of the present invention uses baseband chip to detect the signal of output; Can make full use of the powerful disposal ability of DSP; Accomplish complicated more nonlinear algorithm, do not receive the influence of temperature, technology, noise etc., can realize more accurately control more flexibly.Have analog control scheme again and can realize that feedback control signal is to the continuity of VGA change in gain and the continuity of signal phase variation.
Background technology
Along with the continuous appearance of areas of information technology new technology and the continuous progress of technology, the radio-frequency front-end of various receiver systems and baseband chip have all been obtained bigger development in recent years.Have the day by day ripe of simple function chip research and development; But because of its function singleness; So people turn to attentiveness the research and development with multiple functional chip; Comprise the research and development of the multifunction chip of supporting a plurality of working frequency range and the multifunction chip of supporting multiple mode of operation, can satisfy the increasingly high demand in technology for radio frequency field.
As everyone knows; The baseband chip of different system is different for the amplifier gain control mode and the required precision of radio-frequency front-end; And the variable gain amplifier that has the radio-frequency front-end of traditional receiver system now is generally automatic gain control (AGC) ring of single simulation control mode or the programmable gain amplifier (PGA) of single digital control approach; Perhaps, realize the application of multimode multifrequency with the simply parallel connection of the circuit of two kinds of control modes.Obviously; The amplifier of single control mode can only be used with a kind of specific baseband chip; The needs that can not adapt to multimode multifrequency receiver and other needs Multiband-multimode work system; On this gain amplifier structure with function on limitation, become the significant deficiency that limits its application.
The control circuit theory diagram of conventional analogue AGC is as shown in Figure 1, the variable gain amplifier 101 that simulation AGC is made up of the cascade of some stage gain amplifying stages, and peak detector 102, logarithmic amplifier 103, low pass filter 104 and correlator 105 are formed.Peak detector 102 is used to detect the peak value of gain amplifier 101 output signals, and send logarithmic amplifier 103 that signal is made logarithm and amplify, and the peak signal after correlator 105 amplifies 103 and the reference voltage V of input
RefCompare, the output control signal was advanced low pass filter 104 filtering, was added to variable gain amplifier 101 to control signal, the gain of ride gain amplifier 101.In whole radio-frequency receiving system; AGC is between plural intermediate-frequency filter and ADC; It is according to the intermediate-freuqncy signal intensity that receives, and other amplifies to carry out the different gains level, and the intensity stabilization that makes the output signal is on certain level; Thereby give relatively-stationary input voltage of follow-up adc circuit, can let ADC reach preferable performance and bigger signal to noise ratio like this with lower resolution.
Traditional digital PGA control mode theory diagram is as shown in Figure 2; The PGA of radio frequency front end chip (program-controlled gain amplifier) 21 VGA (variable gain amplifier) 201 by multi-stage cascade; Analog to digital converter 202 constitutes with digital to analog converter 203; Digital baseband chip 22 is by digital comparator 204, and DSP digital signal processing module 205 is formed with accumulator 206.Digital baseband block is given in the amplifying signal output of PGA, and the output feedback signal of digital baseband block is through the gain amplifier of digital to analog converter 203 control VGA, thus the amplification quantity of raising PGA.The formation of traditional controllable gain amplifier comprises control circuit, amplifier main circuit, testing circuit and with reference to input circuit.Because in the prior art, normally utilize digital form ride gain adjustable amplifier, or simulation ride gain adjustable amplifier, front end signal through both one of gain adjustable amplifier amplify.And the baseband chip demodulation also has two kinds of circuit to constitute, and a kind of circuit formation only provides digital control port and the simulation control port is not provided, and another kind of circuit formation only depends on the front radio-frequency chip that the simulation control port is provided and digital control port is not provided.
There are many shortcomings in the prior art controllable gain amplifier: the first, and the simulation ride gain amplifier or the digital control gain amplifier of traditional structure can only be suitable for a kind of baseband chip, are not suitable for shared with different demodulation chips, integrated jointly.Second; Traditional design, digital control gain amplifier is two independently modules with simulation ride gain amplifier, will consider during design that two amplifiers are respectively and cascade and the coupling between the front and back and the isolation of prime and back level; Two kinds of working method switchings on signal link; And some special connection requests etc., not only increased difficult design, also improved the complexity of modular circuit.The 3rd, the circuit structure of traditional parallel two chips makes chip area increase greatly, and cooperates difficulty to strengthen with base band, makes the signal-to-noise ratio degradation of radio-frequency transmitter system, finally influences systematic function.The 4th, the parallel existence disturbed between the different amplifier, and the substrate noise problem, seriously restricted the performance of whole system and the application of high request.
If being arranged, a kind of variable gain control amplifier can support above two kinds of control models; And can between two kinds of control models, switch flexibly as required; Realize the application of multi mode multi band to cooperate different baseband chips; Not only make the flexibility of whole radio-frequency front-end improve greatly, and better adapt to the ever-increasing market demand of areas of information technology new technology.
Description of drawings
Fig. 1 is a conventional analogue AGC control mode schematic block circuit diagram.
Among the figure: 101 is variable gain amplifier, and 102 is peak detector, and 103 is a logarithmic amplifier, and 104 is low pass filter, and 105 is correlator, V
RefReference voltage for input.
Fig. 2 is traditional digital PGA control mode schematic block circuit diagram.
Among the figure: 21 is radio-frequency front-end PGA, and 202 is digital baseband chip, and 201 is the variable gain amplifier VGA of multi-stage cascade; 202 is analog-digital converter ADC, and 203 is digital analog converter DAC, and 204 for being digital comparator; 205 is digital signal processing module, and 206 is accumulator.
Fig. 3 is that the circuit of the variable gain analog control scheme of the embodiment of the invention constitutes block diagram.
Among Fig. 3: 301-303 is the variable gain stages of multi-stage cascade in the variable gain amplifier, and 304 are the fixed gain level, and 305 is voltage-current converter, and 306 and 307 is that comparator is right, the 308th, and charge pump, 309 is capacitor C
3, 310 and 311 are respectively the biasing resistor on the differential signal path, and 312 is that analog to digital converter is right, V
INPAnd V
INNBe differential input signal, V
Bias1And V
Bias2Be the bias voltage on the differential signal path, V
RefBe the reference voltage of input, V
OUTPAnd V
OUTNBe differential output signal.
Fig. 4 is that the configurable variable gain amplifier of the radio frequency GPS front end with analog-and digital-bimodal configuration of the embodiment of the invention constitutes block diagram.
Among Fig. 4: 41 is the amplifier section of radio frequency front end chip, and 22 is the digital baseband processing module, and 301-303 is the variable gain stages of the multi-stage cascade in the variable gain amplifier; 304 are the fixed gain level; 305 is voltage-current converter, and 306 and 307 is that comparator is right, is simulation AGC switching controls switch; 308 is charge pump, and 309 is capacitor C
3, 312 is that analog to digital converter is right, and 413 is digital PGA switching controls switch, and 414 is digital to analog converter DAC, and 415 and 416 are the detection voltage on the difference amplification path, 417 is the control signal of receiver.
Fig. 5 adopts the configurable variable-gain intermediate frequency amplifier of the digital-to-analog single channel of the GPS radio-frequency front-end of the embodiment of the invention to constitute schematic block diagram.
Among Fig. 5: 51 is the configurable intermediate frequency amplifier of radio-frequency front-end; 52 is digital baseband block, and 501～503 is three grades of variable gain amplifier unit, and 504 is the detection output module of analog control scheme; 505 is the I-V conversion control circuit; 506 is analog/digital switching controls switching circuit, and 507 is D/A conversion circuit, and 508 is analog to digital converter.
Fig. 6 is the formation schematic block diagram of the present invention's realization to the configurable intermediate frequency amplifier embodiment of the double mode control of two different digital baseband modules.
Among Fig. 6: the 61st, configurable variable-gain intermediate frequency amplifier; The 62nd, dispose the chip of two kinds of different digital baseband processing modules; The 601st, multistage variable gain amplifier; 602 and 603 are respectively analog-to-digital conversion circuit and D/A conversion circuit, and 604 and 605 is two kinds of different digital baseband processing modules 1 and digital baseband processing module 2.
The one-level intermediate frequency amplifier Gilbert cell structural circuit figure that Fig. 7 adopts for the embodiment of the invention.Among Fig. 7: V
INP, V
INNBe differential signal input, V
BBe gain control end, V
OUTP, V
OUTNBe differential output signal, M1～M4 is the difference input of amplifier, and M5, M6 are the tail current pipe of amplifier.
Embodiment
Through embodiment and combine accompanying drawing, technical scheme of the present invention is further specified below.
First embodiment
The circuit that Fig. 3 has provided the variable gain amplifier analog control scheme of the embodiment of the invention constitutes block diagram.Explain that in conjunction with Fig. 3 analog control scheme is realized constituting among the present invention: input signal V
INPAnd V
INNGet into the differential input end of variable gain amplifier; Variable gain stages 301～303 cascades that variable gain amplifier is three grades connect; Fixed gain amplifier 304 differential input ends are received in 303 two-way difference output; The two paths of differential signals of fixed gain level 304 output, the comparator through difference is to 306 and 307 and the reference voltage V of setting
RefCompare, the comparator 306 of difference and 307 output are through 308 couples of C of charge pump circuit
3 Electric capacity 309 charge or discharge; Make the input of its output appropriate control voltage to voltage-current converter circuit 305; 305 convert voltage control signal into current controling signal; Deliver to the control end of variable gain stages 301～303, control the gain of variable gain amplifying stages at different levels, thereby the amplifying signal that difference is amplified on the path is exported intermediate frequency amplified output signals V through analog to digital converter to 312
OUTPAnd V
OUTN, give digital baseband processing module 22 with stable amplitude, so that guarantee the operate as normal of digital baseband processing module.
Second embodiment
The gain-changeable amplifier circuit that Fig. 4 has provided a kind of analog-and digital-two kinds of control models configuration of application implementation example of the present invention constitutes block diagram.It is identical that the circuit of the embodiment of the invention variable gain amplifier analog control scheme that gain-changeable amplifier circuit formation block diagram and Fig. 3 of analog control scheme configuration provides constitutes block diagram.The configuration of analog-and digital-two kinds of control models is to control implementation pattern through control circuit 414 by receiver control signal 417 to switch; Receive machine control signal 417 and connect control circuit 41 corresponding controling end mouths; The input of the output linking number weighted-voltage D/A converter 413 of control circuit 41, the output of digital to analog converter 413 are added to an input of I-V change-over circuit.If the receiver selection of configuration is digital control pattern, the electronic switch closes of control circuit 414 just switches to digital control pattern path, is detected by baseband processing module chip 22 and amplifies path output V
OUTPAnd V
OUTNAmplitude, baseband processing module chip 22 via electronic switch of control circuit 414 and the figure pattern anti-Kui rotation road that DAC converter 413 constitutes, is added to V-I change-over circuit 305 with feedback digital signal, realizes the amplifier gain control of digital control pattern.If the selection analog control scheme, the electronic switch of control circuit 417 is opened, and just switches to comparator by difference to 306 and 307, charge pump circuit 308 and C
3The simulation model anti-Kui rotation road that electric capacity 309 constitutes; The output signal 415 and 416 of variable gain amplifier amplification channel directly via comparator to 306 and 307; And the analogue detection circuitry that charge pump 308 constitutes detects, and is added in the reference voltage V of comparator to 306 and 307
RefRelatively; Detect the size of two-way differential voltage signal; The right output voltage signal of comparator is accomplished the charge or discharge to electric capacity through charge pump 308 with current signal; Voltage signal on the electric capacity converts the control voltage of control variable gain amplifier 301～303 gains to through V-I change-over circuit 305; 301～303 gains of control variable gain amplifier are big or small, and export stable signal amplitude through analog to digital converter to 312, and the signal amplitude that makes variable gain amplifier output to base band signal processing chip 22 is stablized.Variable gain amplifier 301～303 is two kinds of amplifiers that control model is all shared with fixed gain level 304; Two kinds of control models are to select to switch by the receiver control signal through electronic switch 414; Through V-I change-over circuit 305 conversion outputing gain control signals; Control variable gain amplifier 401～403 gain sizes, thereby accurate control stabilization radio-frequency front-end VGA amplitude output signal.
Dynamic process is described below: when the configurable gain-changeable amplifier circuit 41 of analog/digital works under the analog control scheme, if input signal V
INPAnd V
INN; Amplify and 304 amplifications of fixed gain level through variable gain stages 301-303; The difference amplifying signal 415 and 416 of output send comparator will export difference amplifying signal voltage to 306 and 307 and reference voltage Vref compares; The bigger comparative voltage Vc of output output that comparator is right, 309 chargings of 308 pairs of capacitors of control charge pump, the tank voltage on the capacitor 309 converts the gain controlling current signal into through V-I change-over circuit 305; Deliver to the gain control end of each variable gain stages, variable gain amplifier is placed high gain mode work; If input signal V
INNAnd V
INPWhen strong; The differential output voltage of fixed gain level 304 outputs and reference voltage V ref are relatively; The output amplitude testing circuit is exported less comparative voltage Vc control charge pump with output capacitor is discharged; Tank voltage on the capacitor 309 reduces, and the gain controlling current signal after 305 conversions of V-I change-over circuit reduces, so variable gain amplifier is placed low gain mode work.Gain-changeable amplifier circuit 41 is according to input signal V
INNAnd V
INPPower, accurately adjust the gain amplifier of variable gain amplifier, make analog to digital converter to 312 output to digital baseband processing module 22 differential intermediate frequency V
OUTNAnd V
OUTPAmplitude keep stable.When from the switch-over control signal 417 of receiver with electronic switch 414 closures, the configurable gain-changeable amplifier circuit of control circuit analog/digital works in digital control pattern.If input signal is when more weak, analog to digital converter to 312 output to digital baseband processing module 22 differential intermediate frequency V
OUTNAnd V
OUTPAmplitude descend; This output amplitude is exported Calculation variance by 22 pairs of ADC transducers of baseband chip to 312, and compares with standard variance, and comparative result is exported big digital feedback signal after adding up; This digital feedback signal obtains big analog signal through DAC transducer 413; Through the electronic switch 414 of closure, and through V-I change-over circuit 305 the output conversion of signals of DAC digital to analog converter 413 is become gain control signal, the control variable gain amplifier places high gain mode work.If input signal is when more intense, analog to digital converter to 312 output to digital baseband processing module 22 differential intermediate frequency V
OUTNAnd V
OUTPAmplitude increase; This output amplitude is compared to 312 output Calculation variance and with standard variance by 22 pairs of ADC transducers of baseband chip; The less digital feedback signal of output after comparative result adds up; Digital signal obtains little analog signal through the DAC transducer, through the V-I change-over circuit output conversion of signals of DAC digital to analog converter is become little gain control signal, and the control variable gain amplifier places low gain mode work.So see the intermediate frequency amplifying signal V of amplitude stabilization off through A-D converter at the output signal of variable gain amplifier
OUTNAnd V
OUTP
The 3rd embodiment
Fig. 5 provides the configurable variable-gain intermediate frequency amplifier of radio-frequency module front end digital-to-analog of second application implementation example of the present invention, only provides the formation schematic block diagram of one tunnel difference radio-frequency module front end signal and one road configurable intermediate frequency amplifier among Fig. 5.The radio-frequency module front end signal gets into main amplifier 501～503 and amplifies step by step, and every grade of Amplifier Gain control end all connects the control output end of V-I conversion control circuit 505, the control of every grade of controlled circuit 505 output signals of Amplifier Gain.Gain control mode cooperates through baseband chip 52 to be selected by the receiver control signal.If select analog control scheme; The receiver control signal switches to 2 ends through switching circuit 506; The circuit of analog control scheme and variable gain amplifier analog control scheme embodiment illustrated in fig. 3 constitutes basic identical, and the radio-frequency module front end signal amplifies through three grades of main amplifiers 501～503, and amplifying signal output is through by fixing amplifying stage; The analogue detection circuitry 504 that comparator and charge pump constitute is with reference voltage V
RefCompare; The output of analogue detection circuitry 504 is through 2 ends of switching circuit 506; Deliver to V-I conversion control circuit 505, convert current signal to, go to control the gain of three grades of main amplifiers 501～503; The stable radiofrequency signal of analogue detection circuitry 504 output amplitudes is delivered to next stage digital baseband signal processing module 52 through analog to digital converter 508.Thereby the amplitude of stable mode number converter 308 output signals, the signal amplitude that makes variable gain amplifier output to base band signal processing chip is stablized.If select digital control pattern; Switching circuit 506 switches to 1 end, baseband signal processing module 52 just digital output feedback signal through digital to analog converter 507, and through 1 end and the V-I conversion control circuit 505 of switching circuit 506; Deliver to the gain control end of three grades of main amplifiers 501～503; By the output of digital baseband block 52 control figure feedback signals, the gain size of control amplifier 501～503 realizes closed-loop control.Thereby accurately control the amplification quantity of intermediate frequency amplifier with the exact figure control model, the amplitude of stable mode number converter 308 output signals, it is stable to make variable gain amplifier output to the signal amplitude of base band signal processing chip.
The 4th embodiment
Fig. 6 has the embodiment of the configurable variable-gain intermediate frequency amplifier of digital-to-analog and two kinds of digital baseband chips of adapted for radio frequency chip of the present invention.The 61st, the configurable variable-gain intermediate frequency amplifier of digital-to-analog, the 62nd, dispose two kinds of different digital baseband processing modules 604 and 605 chip.The intermediate frequency amplifier 61 of radio frequency chip comprises the configurable variable gain amplifier 601 of digital-to-analog and analog-to-digital conversion circuit 602 and D/A conversion circuit 603, and digital baseband processing module 604 is two kinds of different baseband modules with digital baseband processing module 605.Set digital baseband processing module 604 and do not have numeral output measuring ability; It can be controlled configurable variable gain amplifier 601 through receiver and be disposed at analog control scheme; Sample by digital baseband processing module 604 through analog-digital converter 602, with the stable output of analog control scheme differential signal amplitude.And digital baseband processing module 605 has numeral output measuring ability; Can control configurable variable gain amplifier 601 through receiver and be disposed at digital control pattern; To amplify the signal of path is sampled by digital baseband processing module 605 through analog-to-digital conversion circuit 602; The feedback digital signal of digital baseband processing module 605 is also delivered to configurable variable gain amplifier 601 through digital analog converter 603, with digital control mode stable output differential signal amplitude.Through configuration variable-gain intermediate frequency amplifier 601, simultaneously different with two kinds digital baseband processing modules 604 and 605 collocation realize that the intermediate frequency amplifier of analog control scheme control and figure pattern control is stablized output amplitude.
Fig. 7 provides fixing electric current to difference input pipe M1～M4 for the tail current pipe M5～M6 that utilizes of the single-stage intermediate frequency amplifier of the Gilbert cell structure that adopts among the present invention, and difference input M1～M4 pipe amplifies output with the differential signal of input.Radio-frequency front-end differential input signal V
INPAnd V
INNThe corresponding grid that inserts variable gain amplifier M1 and M3, the drain electrode of M1 and M3 is respectively the difference output end V of variable gain amplifier
OUTPAnd V
OUTP, the grid of variable gain amplifier M5 and M6 is gain control end V
B
It will be understood by those skilled in the art that and under the prerequisite that does not deviate from broad scope of the present invention, the foregoing description is made some changes.Thereby the present invention is not limited in disclosed specific embodiment.Its scope should contain core of the present invention and the interior all changes of protection range that appended claims limits.
Claims (10)
1. configurable variable gain amplifier of analog/digital; It is characterized in that: configurable variable gain amplifier is a programmable-gain module in the radio-frequency front-end; Its input inserts the radio-frequency front-end intermediate-freuqncy signal; Its output connects next stage digital baseband process chip, and its external interface has a pattern control port and a gain digital Control and Feedback port;
Said pattern control port connects the radio-frequency transmitter control signal, is used for the control model switching part, selects gain control mode;
Said gain digital Control and Feedback port connects the feedback signal port of next stage digital baseband process chip.
2. the configurable variable gain amplifier of a kind of analog/digital according to claim 1, it is characterized in that: the composition of said programmable-gain module comprises
Variable gain amplifier,
Simulation model anti-Kui rotation road,
Figure pattern anti-Kui rotation road,
The mode switch circuit,
The V-I transducer, and
Analog to digital converter is right; Wherein
Said variable gain amplifier is that the variable gain of an analog/digital mode common is amplified path;
The pattern control port of said mode switch circuit connects the radio-frequency transmitter control signal; The mode switch circuit is with anti-rotation road and the anti-rotation road of presenting of figure pattern of presenting of selection mode connection mode simulation models, and simulation model is counter presents rotation road and variable gain and amplify path and form analog gain control model circuit; Variable gain amplifies path and digital gain control model circuit is formed on figure pattern anti-Kui rotation road;
Said V-I transducer has one two input or door;
Said analog to digital converter is right to being the 2bit analog to digital converter, and the analog signal conversion of respectively the two-way radio-frequency differential gain of variable gain amplifier output being amplified is a digital signal, delivers to the input of digital baseband processing module.
3. the configurable variable gain amplifier of a kind of analog/digital according to claim 1 and 2 is characterized in that: said variable gain amplifier comprises several variable gain amplifying stages and a fixed gain level; Wherein
The differential configuration circuit of said several variable gain amplifying stages; Be connected in series successively; Two inputs of first order variable gain amplifying stage connect radio-frequency front-end two-way differential input signal, and two difference output ends of final stage variable gain amplifying stage connect two differential input ends of fixed gain level;
Two difference output end correspondences of said fixed gain level circuit are connected to the differential input end on simulation model anti-Kui rotation road, and the right input of analog to digital converter also is connected in parallel.
4. the configurable variable gain amplifier of a kind of analog/digital according to claim 3; It is characterized in that: said simulation model is counter presents rotation route comparator pair and charge pump formations that be connected in series, and this simulation model is counter presents the individual range detector that is used to detect the difference output amplitude of variable gain amplifier of rotation Lu Weiyi; Wherein
The corresponding differential amplitude output that connects variable gain amplifier of the right input of said comparator, the right comparison termination of comparator is gone into reference voltage Vref, the be connected in parallel input of charge pump of two right outputs of comparator;
Said charge pump is simulation control charge pump, and its output is the output of range detector, connects an input of V-I change-over circuit.
5. the configurable variable gain amplifier of a kind of analog/digital according to claim 2 is characterized in that: said digital control pattern anti-Kui rotation road comprises mode switch circuit and the DAC digital to analog converter that is connected in series with mode switch circuit one end; Wherein
Said mode switch circuit is digital switching controls parts; It comprises electronic switch and switch-over control signal end; The electronic switch of commutation circuit receives the control from the receiver control signal; Realize the switching of control model, make the programmable-gain module work in numerically controlled PGA pattern and perhaps work in the simulation agc mode;
The input of said DAC converter connects the feedback signal terminal of digital baseband processing module, and the output of DAC digital to analog converter connects another input of V-I change-over circuit, and the V-I change-over circuit becomes the gain controlling electric current with the output conversion of signals of DAC digital to analog converter.
6. the configurable variable gain amplifier of a kind of analog/digital according to claim 2 is characterized in that: said analog gain control model circuit and digital gain control model circuit also comprise the V-I change-over circuit; The output on analog control scheme anti-Kui rotation road and digital control pattern anti-Kui rotation road; Select to connect the V-I change-over circuit; V-I change-over circuit output connects some variable gain stage gain control ends with the gain controlling electric current that converts to, controls the gain of each variable gain amplifying stage;
Said analog gain control model circuit and digital gain control model circuit are anti-indicial response circuit; Can make amplifier gain with control voltage dB-linear linear change; Gain control signal output connects the gain control end of each variable gain stages circuit, and the control variable gain amplifier is to the undistorted amplification of input signal.
7. the configurable variable gain amplifier of a kind of analog/digital according to claim 2; It is characterized in that: the DAC transducer on said digital control pattern anti-Kui rotation road is the current-mode DAC circuit of 5bit, and the reference voltage input terminal of DAC transducer connects the reference voltage V ref that the programmable-gain module provides; Under the digital controlled signal that comes portion's receiver cooperates, select digital control pattern anti-Kui rotation road to work in the digital variable gain control mode, the output of DAC transducer provides the I-V change-over circuit to form the gain controlling electric current.
8. the configurable variable gain amplifier of a kind of analog/digital according to claim 3; It is characterized in that: the comparator on said analog control scheme anti-Kui rotation road is to being the circuit structure of output parallel connection; Be used for comparative result with variable gain amplifier two-way difference amplified output signals and reference voltage Vref; Supply with charge pump after the addition to capacitor charge and discharge; Voltage on the electric capacity is converted to the gain controlling electric current through the V-I transducer, guarantees that the variable gain amplifier output voltage amplitude is within controlled area charactert.
9. the configurable variable gain amplifier of a kind of analog/digital according to claim 3; It is characterized in that: said variable gain amplifier is the precise gain amplifier; It is the comparison foundation with the reference voltage; The gain controlling electric current that simulation model anti-Kui rotation road and figure pattern anti-Kui rotation road provide is realized the accurate control of accurate control amplifier gain, and the radio-frequency front-end signal of the high-gain and the big range of linearity is provided for the baseband processing module chip of digital operation mode or analog operation pattern;
Said reference voltage Vref is that the reference voltage that the linear voltage regulator LDO circuit by the programmable-gain module provides is a reference voltage.
10. according to the configurable variable gain amplifier of the described a kind of analog/digital of claim 1-9; It is characterized in that: said variable gain amplifier is the multiplex circuit of the gain amplifier of digital gain control model and analog gain control model, can connect two dissimilar digital baseband processing modules simultaneously;
The variable gain amplifying stage of said variable gain amplifier is the Gilbert cell structural circuit; As preferably, adopt three grades of variable gain amplification grade circuits to be connected in series; The structural circuit of three grades of variable gain amplifying stages is identical, and the gain control end of each variable gain amplifying stage inserts a dynamically bias current of adjustment, is used for accurately adjusting amplifier's gain;
The fixed gain amplifying stage of said variable gain amplifier also is the Gilbert cell structural circuit, and its gain control end inserts a fixing bias current, is used to improve driving force and big output voltage swing.
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| CN2010102689896A CN102386869A (en) | 2010-08-27 | 2010-08-27 | Analog/digital configurable variable-gain amplifier |
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| CN2010102689896A CN102386869A (en) | 2010-08-27 | 2010-08-27 | Analog/digital configurable variable-gain amplifier |
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Application publication date: 20120321 |