CN102571227A - Amplitude detection circuit with direct current offset elimination function - Google Patents
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Abstract
The invention discloses an amplitude detection circuit with a direct current offset elimination function. The amplitude detection circuit has a differential structure, and consists of a direct current offset elimination circuit, an amplitude limiting amplification circuit, an amplitude detection circuit, a current addition circuit and a filtering circuit, wherein the direct current offset elimination circuit comprises a plurality of direct current offset suppressors with a low-pass filtering function; the amplitude limiting amplification circuit comprises a plurality of amplitude limiting amplifiers; and the amplitude detection circuit comprises a plurality of amplitude detection units. A differential radio frequency signal is amplified to be saturated by a plurality of stages of cascaded amplitude limiting amplifiers, the output of each stage of amplitude limiting amplifier is detected by the amplitude detection units, output detected amplitude values are transmitted to the current addition circuit for addition, and the sum is filtered by the low-pass filtering circuit to obtain output voltage related to the amplitude of the input signal. The circuit can be adapted to the requirements of high monolithic integration level of a radio frequency chip, and is applied to a high-integration level zero-intermediate frequency receiver with the requirement of signal amplitude detection.
Description
Background technology
In recent years along with the continuous appearance of areas of information technology new technology and the continuous progress of technology; The change in signal strength scope of the input signal of the radio-frequency front-end of various receiver systems is all very big; So need under the prerequisite that guarantees the error rate, control amplifier's gain through detecting the intensity that receives signal; So that reach power controlling intensity, avoid the saturation of receiver, obtain stable output signal strength.
As everyone knows; Modern system requires increasingly high to the integrated level of system; DC maladjustment has become employing zero intermediate frequency reciver unavoidable problem simultaneously, and the DC maladjustment of prior art receiver system elimination function all is the performance that needs outside original paper to obtain.And the amplitude detection unit of existing receiver generally all is the structure through the Gilbert cell rectifier simultaneously, and the amplitude detection unit of this structure needs four-layer transistor to pile up, and is not suitable for low-pressure structure.Based on above analysis; The existing technology of having penetrated; OJAS S L. Analysis of switched capacitor common mode feedback circuit. IEEE Transactions on Circuits, 2003,50 (12): 906-917. KIMURA K. A CMOS logarithm IC IF amplifier with unbalanced source coupled pairs [J]. " IEEE Journal of Solid-state Circuits; 1981; 28 (1): 78-83. ", the schematic block circuit diagram of the radio frequency amplifier of amplitude detection circuit is as shown in Figure 1, and signal is amplified to saturated through 102 ~ 105 amplifier; Detect by 106 to 110 output amplitudes respectively again and transfer current signal to each grade amplifier; Every grade output current is via the direct current adder circuit, and last again through the final voltage of low-pass filter circuit output, suitable input signal dynamic range is lower.The elimination of DC maladjustment is through resistance R 1, and R2 and capacitor C 1 and feedback subtracter 101 are realized.Because capacitor C 1 needs the appearance value too big, must adopt the outer electric capacity of sheet.
There are many shortcomings in the rf gain amplifier of prior art: the first, and the amplitude detection unit that radio frequency amplifier adopts all is not suitable for low pressure applications.The second, the system that can not be adapted to need HDR and have strong signal input to require.The 3rd, radio frequency amplifier is in order to obtain low cut-off frequency, and eliminating DC maladjustment all needs external discrete component circuit.Increase the cost of overall plan, increase the input and output pin of chip, whole design difficulty strengthens, and reduces the stability of signal.
If a kind of amplitude detection circuit of eliminating function with DC maladjustment is arranged; Can DC maladjustment be eliminated the extra pin of unnecessary again increase simultaneously; Improve amplitude detection unit simultaneously and be fit to low pressure applications, just can increase its application scenario, cooperate the amplitude controlled function of more radio frequency chip; 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.
Summary of the invention
The invention belongs to the technology for radio frequency field, relate to a kind of amplitude detection circuit, relate in particular to the amplitude detection circuit that the band DC maladjustment is eliminated function, be used for radio-frequency transmitter.
Summary of the invention
The objective of the invention is to be not suitable for low pressure applications, to adopt outer electric capacity of sheet and cost increase to reduce the defective of signal stabilization again for solving above-mentioned that prior art radio frequency receiver front end constitutes; Provide a kind of chip integration to become to have DC maladjustment to eliminate the amplitude detection circuit of circuit; It is used for radio-frequency transmitter; Both can realize function to the amplitude detection of input signal; Can suppress simultaneously the DC maladjustment of circuit itself, be applicable under the operating on low voltage condition, the amplitude of the input signal of wide region is carried out the log-linear quantification.Be integrated in the amplitude detection circuit of the band DC maladjustment elimination function in a slice; Can satisfy the low pressure applications occasion, the function and the DC maladjustment that possess amplitude detection circuit are simultaneously eliminated function, can better reduce hardware and system power expense; Improve system signal noise ratio, optimization system design.
Above-mentioned purpose of the present invention is to realize through following technical scheme:
A kind of amplitude detection circuit with DC maladjustment elimination function, the circuit of its chip integration one-tenth, multi-stage cascade, differential configuration constitutes:
A DC maladjustment that comprises the DC maladjustment TVS of M level band LPF suppresses circuit;
An amplitude restriction amplifying circuit that comprises M level limiting amplifier;
An amplitude detection circuit that comprises N level amplitude detection unit, N are M+1; And
A current adding circuit; With
A low-pass filter circuit;
Difference censorship is surveyed input signal connecting band DC maladjustment and is eliminated the differential input end of DC maladjustment TVS that the amplitude detection circuit differential input end of function comprises differential input end and the first order band LPF of the first order amplitude detection unit that is connected in parallel; The corresponding difference output end that connects the DC maladjustment TVS of first order band LPF of the differential input end of first order limiting amplifier; Its differential output signal feeds back to the differential feedback input of the DC maladjustment TVS of first order band LPF; And the corresponding differential input end of next stage amplitude detection unit and the differential input end of the DC maladjustment TVS that next stage has LPF of connecting, multi-stage cascade connects successively; The output of every grade of amplitude detection unit connects an input of current adding circuit; The current adding circuit output connects low pass filter and amplitude detection output is provided, and is used for the interior difference that realizes of sheet and inspects the elimination and the amplitude detection of the DC maladjustment of surveying input signal by ready samples.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, and it is that described amplitude restriction amplifying circuit comprises M level limiting amplifier, and the span of M is 3～6; The circuit structure of every grade of limiting amplifier is identical; Every grade of limiting amplifier input is connected in series with DC maladjustment TVS output with one-level band LPF separately; The be connected in series input of DC maladjustment TVS of next stage band LPF of the output of every grade of limiting amplifier is used to offset the DC maladjustment that the DC maladjustment TVS of prime band LPF causes.
DC maladjustment circuit through peer's band LPF is separated the DC maladjustment component, and the DC maladjustment in exporting with the DC maladjustment TVS of prime band LPF offsets, and advances successively, realizes the purpose of whole amplitude detection circuit elimination DC maladjustment.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, and it is said limiting amplifier by importing pipe, and load pipe and tail current pipe and bias current circuit constitute, and the load pipe is the metal-oxide-semiconductor that collapsible diode connects; Limiting amplifier is a fixed gain amplifier, and its yield value is confirmed by the breadth length ratio of the load metal-oxide-semiconductor that the breadth length ratio of importing metal-oxide-semiconductor is connected with collapsible diode; Be used to realize that large-signal and small-signal can both satisfy the detection requirement of amplitude detection unit.
Limiting amplifier limits excessive signal amplitude in amplification input signal; Make within small-signal and the large-signal detection range of output signal after amplitude limit amplifies, realize that large-signal and small-signal can both satisfy the detection requirement of amplitude detection unit in amplitude detection unit.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, and it is to comprise low pass filter and the DC maladjustment TVS that is connected in series; Wherein
Said low-pass filter circuit is made up of active pull-up and passive capacitive; Active pull-up is the multi-stage cascade metal-oxide-semiconductor; Each metal-oxide-semiconductor is operated in linear zone, is used for to realize big resistance resistance than small size, and the passive capacitive of smaller capacitive value constitutes low pass filter; On sheet, realize, practice thrift chip area and cost;
The feedback input end of said DC maladjustment TVS connects the limiting amplifier output, constitutes DC maladjustment and suppresses feedback loop; Be used for low pass filter is extracted the DC component of the data after amplifying through the next stage limiting amplifier,, offset the DC maladjustment composition in the limiting amplifier circuit with the output signal subtraction of the limiting amplifier of prime.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, and it is that said DC maladjustment TVS is a subtraction device, comprises the input of first difference to pipe, and the input of second difference is to pipe, and tail current pipe and biasing circuit; The input of each difference is to the source electrode parallel connection of pipe, and the input of first difference intersects corresponding parallel connection to two drain electrodes of pipe and the input of second difference to two drain electrodes of pipe, and first difference is imported managing and second difference is imported managing shared tail current pipe and biasing circuit; First difference of subtracter is imported the low-pass filter circuit output that the input of pipe is connected DC maladjustment TVS at the corresponding levels, and the input of second difference connects with one-level limiting amplifier output the input of pipe; The input of first and second difference is identical to the breadth length ratio and the operating state of pipe, and is opposite to the current polarity of the drain electrode alter-parallel node of pipe at first and second input differences; Be used for realizing suppressing DC maladjustment.
The subtracting each other of input and feedback signal input that has the signal in the DC maladjustment TVS of LPF is that opposite polarity circuit through two pairs of breadth length ratios and the identical input pipe of operating state constitute is realized; Signal input part of subtracter inserts low-pass filter circuit output signal; Another signal input part inserts limiting amplifier output signal; Input is identical to pipe breadth length ratio and operating state, and polarity is opposite, is used for realizing suppressing DC maladjustment.Feedback signal is input to after through the low-pass filter circuit of being made up of active pull-up and passive capacitive amplifies output then and superposes with another output to input pipe that input signal is input in a pair of input pipe; But opposite in sign; The effect that playing property subtracts; So just be added to the DC maladjustment signal in the feedback in the signal with opposite symbol, played the purpose of filtering DC maladjustment.
Said band DC maladjustment is eliminated the amplitude detection circuit of function; It is that said amplitude detection circuit is made up of N level amplitude detection unit; First order amplitude detection unit input connects censorship and surveys the input signal end; Thereafter the input of every grade of amplitude detection unit connects the output of corresponding upper level limiting amplifier; The corresponding input that connects current adding circuit of the output of each amplitude detection unit is used to the current amplitude that current adding circuit provides N detection signal, realizes the current amplitude addition of N detection signal.
Difference radio-frequency signal is amplified to saturated via the limiting amplifier of cascade; The amplitude size that amplitude detection unit output detects is all passed through in every grade output then; The size that detects according to amplitude detection circuit is again via the current adding circuit addition, again through just obtaining the output voltage relevant with input signal amplitude after the low-pass filter circuit filtering.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, its be said amplitude detection unit by two asymmetric source coupled differential to pipe, two load current pipes, image current pipe and tail current biasing circuit constitute; Wherein
Said two asymmetric source coupled differential comprise that to pipe the first source coupled differential is to pipe; The second source coupled differential is to pipe; Two source coupled differential are identical to tubular construction, and two transistorized breadth length ratios that two source coupled differential are right are asymmetric, and it is right to constitute asymmetric source coupled differential; Two source coupled differential are to the parallelly connected P road input signal that inserts of the grid of two P road input pipes of pipe; Two source coupled differential insert N road input signal to the grid parallel connection of two N road input pipes of pipe, and two source coupled differential are to the source cross-coupled of the pipe corresponding load pipe that is connected in parallel; The transistor of amplitude detection unit is for being fit to the three layer transistor structure of low-voltage technology, and its output current Iout is directly proportional with input voltage, is used to detect the amplitude size of input signal.
Said band DC maladjustment is eliminated the amplitude detection circuit of function, and it is that said two asymmetric source coupled differential are right to being adjustable asymmetric source coupled differential, and the first source coupled differential is D to two transistor breadth length ratios of pipe
:1, the second source coupled differential also is D to two transistor breadth length ratios of pipe
:1, the span of D is 2～8, is used in span, regulating two transistor breadth length ratio D values through technology, obtains the Optimization result value, makes the error of amplitude quantizing little and low in energy consumption, reaches the application system circuit requirement.
The detected amplitude circuit is the difference of breadth length ratio of pipe is obtained and to import relevant output current through input difference; The error of the electric current of the sign input signal amplitude that different breadth length ratios obtains is different; The final breadth length ratio of setting is to have adopted results of optimum design, can make error reach minimum.Two-way input to the pipe breadth length ratio be breadth length ratio D doubly, the span of D is 2～8; Current subtraction after the subtraction transistor makes input voltage through the input pipe amplification of two different breadth length ratios, and, the output current that characterizes the input voltage amplitude is provided through the transistorized mirrored transistor of subtraction.As preferentially, the D value is 4.
Said band DC maladjustment is eliminated the amplitude detection circuit of function; It is that the differential pair tube of each amplitude detection unit in the said detected amplitude circuit is the breadth length ratio dissymmetrical structure; Differential pair tube is that breadth length ratio is different because of ratio; Output current is different with the breadth length ratio example difference of differential pair tube, the different and variation in regular turn of the breadth length ratio example of the differential pair tube of each amplitude detection unit, and the log-linear that is similar in regular turn of the breadth length ratio example of differential pair tube changes; The size of each amplitude detection unit output current also can be different in regular turn, and each amplitude detection unit output current is log-linear variation in regular turn with the changes in amplitude of input signal.
Each the amplitude detection unit output current of amplitude detection circuit and the relation of signal input range are the log-linear relations; Be big or small linear after the amplitude of size and the input signal of output voltage is taken the logarithm, realize that the output current sum of each amplitude detection unit and input signal amplitude are approximate log-linear relations.
Described limiting amplifier circuit; Constitute by several limiting amplifiers; The amplifier architecture of each limited amplitude all is to adopt metal-oxide-semiconductor that the diode of folded form connects as load, and gain all is the breadth length ratio that is decided by to import the metal-oxide-semiconductor that the wide length of metal-oxide-semiconductor is connected with diode.
Said amplitude detection unit is made up of several amplitude detection unit, and the input of each amplitude detection unit all connects the output of a limiting amplifier, and the output of each amplitude detection unit simultaneously all connects the input of current adding circuit.The effect of each amplitude detection unit all is the amplitude that detects input voltage, transfers its range signal to current signal.It is right that each amplitude detection unit all comprises two pairs of non-equilibrium source coupled differential of coming round; Two transistorized breadth length ratio ratios that the source coupled differential is right are D; The output current Iout of this structure is directly proportional with input voltage, and has only three layer transistor, is fit to low-voltage technology.
The input of each limiting amplifier all is connected with an output that has the DC maladjustment TVS of LPF; The output of each limiting amplifier connects an amplitude detection unit and the next input that has the DC maladjustment TVS of LPF, and the output of each amplitude detection unit connects the input of current adding circuit.Difference radio-frequency signal is amplified to saturated via the limiting amplifier of cascade; The amplitude size that amplitude detection unit output detects is all passed through in every grade output then; The size that detects according to amplitude detection circuit is again via the current adding circuit addition, again through just obtaining the output voltage relevant with input signal amplitude after the low-pass filter circuit filtering.
Adopt the feedback form DC maladjustment that has the LPF ability to suppress circuit during the described DC maladjustment TVS that has a LPF.This circuit comprises low pass filter and two parts of DC maladjustment subtracter.Low pass filter extracts through the DC component in the data after the amplification of next stage amplitude limit amplifying unit.Low pass filter is made up of active pull-up and passive capacitive; Active pull-up is realized by the multi-stage cascade metal-oxide-semiconductor that is operated in linear zone; This resistance can be done very greatly, and shared area is smaller again, and relevant capacitance value can obtain smaller; Resistance and electric capacity can be realized on sheet like this, have practiced thrift chip cost.
Subtracting each other of the input of the signal in the said DC maladjustment TVS that has a LPF and feedback signal input is that opposite polarity circuit through two pairs of breadth length ratios and the identical input pipe of operating state constitute is realized; Feedback signal is input to after through the low pass circuit of being made up of active pull-up and passive capacitive amplifies output then and superposes with another output to input pipe that input signal is input in a pair of input pipe; But opposite in sign; The actual effect that plays is wanted to subtract exactly; So just be added to the DC maladjustment signal in the feedback in the signal with opposite symbol, played the purpose of filtering DC maladjustment.
Said amplitude detection unit is that the difference through the right breadth length ratio of input difference obtains and imports relevant output current; The error of the electric current of the sign input signal amplitude that different breadth length ratios obtains is different; The final breadth length ratio of setting is to have adopted results of optimum design; Can make error reach minimum, adopt single tube tail current structure for the requirement of satisfying low voltage designs simultaneously, be superior to traditional laminated type tail current structure.
The present invention overcome DC maladjustment in the prior art structure eliminate circuit can not be fully in the shortcoming of chip integration one-tenth and inapplicable operating on low voltage; Make this radio frequency chip can realize having saved outer member, reduced circuit overhead and power consumption improving integrated level; The performance of raising system; And the sensitivity of radio-frequency transmitter etc., can also reduce equipment power dissipation and volume thus, practice thrift cost.The present invention is applicable to the radio frequency chip in multifrequency broadband, and being particularly suitable for needs to reduce the outer device of sheet, increases the workplace of the dynamic range of input signal.Both satisfy market the integrated level of radio frequency chip had been required demand increasingly high and output voltage stabilization, reduced circuit complexity again, improved stability, under the prerequisite that satisfies correct detection signal amplitude, improved the dynamic range of system simultaneously.DC maladjustment is eliminated circuit and is integrated in the sheet, can adapt to the requirement of chip miniaturization high integration, can adapt to the 1.8V operating on low voltage, saves the System on Chip/SoC area, has reduced system cost.
Substantial effect of the present invention:
1, the tail current source of amplitude detection unit of the present invention replaces the tail current pipe of two traditional pipes with single tail current pipe; Can well be adapted to the occasion of low voltage application; Adopt the decreased number of pipe, can adapt to the 1.8V operating on low voltage, satisfy the high request of system for low pressure.
2, band DC maladjustment of the present invention is eliminated the amplitude detection circuit of function; Adopt multistage limiting amplifier structure, have the high-gain fan-out capability, the gain of the circuit of limiting amplifier is only relevant with the breadth length ratio of pair of pipes; Irrelevant with temperature and technology; The ability of entire circuit opposing temperature and technique change is strong, and it is small with temperature and technique change to gain, the requirement that is fit to be applied to the needs HDR and has strong signal to import.
3, low-pass filter circuit of the present invention and DC maladjustment are eliminated in integrated of the circuit; Circuit structure does not have peripheral components; Reduce chip area and system cost; Amplitude detection unit adopts adjustable asymmetric source coupled differential right, helps the D value of technology adjustment input pipe breadth length ratio, optimization system and raising system signal noise ratio.
4, circuit of the present invention can be applicable to the demodulator circuit of zero intermediate frequency circuit, satisfies the requirement of system multi-frequency wide band radio-frequency chip.
Description of drawings
Fig. 1 is the amplitude detection circuit of prior art;
Among Fig. 1: 11-DC maladjustment is eliminated circuit, 101-subtraction circuit, 12-limiting amplifier, 102 ~ 105-basic limiting amplifier, 13-amplitude detection unit, 106 ~ 110-amplitude detection unit, 14-voltage adder circuit.
Fig. 2 a is the amplitude detection circuit formation block diagram that DC maladjustment is eliminated that has of first embodiment of the invention;
Among Fig. 2 a: 21-DC maladjustment suppresses circuit, 22-amplitude restriction amplifying circuit, 23-amplitude detection circuit, 24-current adding circuit, 25-low-pass filter circuit.
Fig. 2 b is the amplitude detection circuit formation block diagram that DC maladjustment is eliminated that has of second embodiment of the invention;
Among Fig. 2 b: the DC maladjustment TVS of 201,203,205,207-band LPF, 202,204,206,208 limiting amplifiers, 209～213-amplitude detection unit, 214-current adding circuit, R1 are LPF resistance, C1 is a LPF electric capacity.
Fig. 3 is the circuit principle of compositionality figure of the limiting amplifier of the embodiment of the invention;
Among Fig. 3: M1, M2-positive and negative output amplifier tube, M3, the load pipe of M4-diode syndeton, M5, M6, M7, M8, M9, M10-tail current pipe, R1 and C1-tail current filter resistance and electric capacity.
Fig. 4 is the DC maladjustment suppressor circuit figure that has LPF of embodiment of the invention differential configuration;
Among Fig. 4: M1, M2-input pipe, M3, the input pipe of M4-DC maladjustment feedback, M8; The load pipe that M9-diode connects (needs to confirm: M5, M6, M7-the provide transistor of electric current, M11; M12 and M13-tail current pipe, M10-bias current pipe) R1, C1-low pass filter, Ibias-from the electric current of reference current source; The transistor that M14 ~ M19-active pull-up connects,, C2, the big electric capacity that C3-chip integration becomes, Vosp and Vosn-difference DC maladjustment signal output.
Fig. 5 is the circuit diagram of the amplitude detection unit of the embodiment of the invention;
Among Fig. 5: M1 ~ M4 is an input pipe, M1 wherein, the breadth length ratio of M2 is M3, the D of M4 doubly, M7, M8-load current pipe, M9-current subtraction transistor, the mirrored transistor of M10-M9.
Fig. 6 is the DC maladjustment suppressor circuit figure that has LPF of the differential configuration of another embodiment of the present invention;
Among Fig. 6: M1, M2-input pipe, M3, the input pipe of M4-DC maladjustment feedback, M5; M6, the M7-transistor of electric current is provided, M11, M12 and M13-tail current pipe; M10-bias current pipe, R1, C1-low pass filter, Ibias-from the electric current of reference current source; The active pull-up transistor of M14 ~ M19-cascade, C2, C3-big electric capacity, Vosp and Vosn-difference DC maladjustment signal output.
Fig. 7 is the amplitude detection module and the outer LNA of sheet that DC maladjustment is eliminated function that have of the embodiment of the invention, and PGA and frequency mixer are connected schematic block diagram with filter;
Among Fig. 7: 71-single-ended LNA circuit, 72-digital gain control module, 73-single-ended transfer difference configurable module PGA that gains; 74-phase-locked loop circuit, 75,76-mixer module; The amplitude detection circuit that 77-amplitude detection module is promptly eliminated with DC maladjustment, 78,79-low-pass filter circuit; 710,711-intermediate frequency automatic gain control circuit AGC, 712-base band demodulating chip.
Fig. 8 is applied to the connection layout of amplitude monitoring demodulator circuit for a kind of amplitude detection circuit that utilizes the band DC maladjustment to eliminate of the embodiment of the invention;
Among Fig. 8: the amplitude detection circuit that 81-band DC maladjustment is eliminated, 82-low pass filter, 83-comparator.
Embodiment
Through embodiment and combine accompanying drawing, technical scheme of the present invention is further specified below.
First embodiment
The amplitude detection circuit that Fig. 2 a has provided the band DC maladjustment elimination function of the embodiment of the invention constitutes block diagram.The amplitude detection circuit of band DC maladjustment elimination function is suppressed circuit 21, is comprised that the amplitude restriction amplifying circuit 22 of M level limiting amplifier, the amplitude detection circuit 23 that comprises N level amplitude detection unit, current adding circuit 24 and filter 25 constitute by the DC maladjustment of the DC maladjustment TVS that comprises M level band LPF.Differential Detection signal connecting band DC maladjustment is eliminated the amplitude detection circuit differential input end of function and is connected the differential input end of DC maladjustment TVS of differential input end and the first order band LPF of first order amplitude detection unit; The corresponding difference output end that connects the DC maladjustment TVS of first order band LPF of the differential input end of first order limiting amplifier; Its differential output signal feeds back to the difference control end and the corresponding differential input end of next stage amplitude detection unit and the differential input end of the DC maladjustment TVS that next stage has LPF of connecting of the DC maladjustment TVS of first order band LPF; Multi-stage cascade successively; The output of every grade of amplitude detection unit connects the input of current adding circuit; The current adding circuit output connects low pass filter and amplitude detection output is provided, and is used for realizing in the sheet amplitude detection of input signal and the elimination of DC maladjustment.At first input signal carries out amplitude detection through first amplitude detection unit; Formation current signal after the detection inputs to current adding circuit; Because input signal also need amplify through first order limiting amplifier, if directly through M level limiting amplifier, then the flip-flop in the input signal also can be owing to the effect of amplifying is saturated with whole signal link; For making the input signal link unsaturated because of the DC maladjustment composition; Need at first eliminate the DC maladjustment composition in the circuit, earlier through one-level band LPF DC maladjustment TVS, this TVS utilizes limiting amplifier to be output as feedback signal and obtains a feedback DC component input signal; Feedback DC component and input signal are subtracted each other through the DC component of LPF; Obtain an input signal that suppresses the DC maladjustment composition, again this input signal is amplified through limiting amplifier, can avoid the DC maladjustment composition to cause limiting amplifier saturated.For making each limiting amplifier can both operate as normal; Add the DC maladjustment TVS of a band LPF at the input of each limiting amplifier; For detecting the amplitude size of each limiting amplifier output signal, connect an amplitude detection unit in each limiting amplifier output.By that analogy, repeat said process M time, final making needs the small-signal of detection to be amplified fully up to saturated, and the minimum radius accuracy of detection of input signal depends on the size that is amplified to saturated minimum signal.M limiting amplifier is amplified to input signal saturated; The output of N amplitude detection unit is through current adding circuit 24 accumulation process; The output of current adding circuit 24 is again through low pass filter 25 filtering; High frequency clutter component in the filtered signal obtains a voltage signal that comprises input signal amplitude information, accomplishes input signal amplitude and detects.
Second embodiment
The amplitude detection circuit that Fig. 2 b has provided the band DC maladjustment elimination function of the embodiment of the invention constitutes block diagram.It is 4 that M is set, N=M+1.The amplitude detection circuit that the band DC maladjustment of embodiment is eliminated function comprises the 1st grade of the-the 4th grade of DC maladjustment TVS 201,203,205 and 207 that has LPF; The 1st grade of the-the 4th grade of limiting amplifier 202,203,206 and 208; The 1st grade of the-the 5th grade of amplitude detection unit 209,210,211,212 and 213; And with 208, current adding circuit 214 and low-pass filter circuit 215.Realize in conjunction with amplitude detection function among Fig. 2 b explanation the present invention:
Differential input signal Vinn and Vinp are input to the DC maladjustment TVS 201 that the first order has LPF; Simultaneously with the output of the limiting amplifier of back level electric current through the signal subtraction behind the LPF; Filtered characterization wherein the DC maladjustment composition size of output in the signal; Thereby the DC maladjustment composition that can offset in the input circuit through this elimination effect prevents that late-class circuit is saturated; The signal with DC maladjustment amplifies through 202 amplitude-limiting circuits, and wherein small-signal will directly amplify, and large-signal will be limited amplitude and no longer amplification; The output of amplitude-limiting circuit is input to 210 amplitude detection unit again; Can detect the size of exporting input signal amplitude through the right effect of uneven difference, and transfer it to current signal, obtain the current signal that an amplitude with signal presents log-linear through current mirror circuit at last; The output of amplitude detection circuit 202 connection simultaneously 203 has the DC maladjustment TVS of LPF; 201 effect before being similar to, the DC maladjustment of level after eliminating needs the small-signal of detection to be amplified fully up to saturated through repeating N final making of above-mentioned process; The detected amplitude of minimum input signal is decided by to be amplified to the signal magnitude of saturated minimum; Limiting amplifier with input signal be amplified to saturated after, 209 ~ 213 amplitude detection unit will be separately electric current that detected range signal transformed be input to current adding circuit 214, the output of current adding circuit 214 obtains the output voltage of final ability reflected signal amplitude through the filtering of R1 and C1.The dynamic range of the detected signal of ability depends on 202,204, and the gain of 206,208 these several range detectors is long-pending.
Fig. 3 provides the circuit principle of compositionality figure of the limiting amplifier of the embodiment of the invention.As shown in Figure 3: M1 and M2 are positive input amplifier tube and negative input amplifier tube, and corresponding input signal Vinn and the Vinp of inserting of the base stage of positive and negative input amplifier tube M1 and M2, M3 and M4 are respectively the load pipe of positive input amplifier tube M1 and negative input amplifier tube M2; M3 and M4 load pipe are the diode syndeton, the corresponding drain electrode that is attempted by positive and negative input amplifier tube M1 and M2 of base drain electrode of M3 and M4, and positive and negative input amplifier tube is output as Voutn and Voutp; The be connected in parallel drain electrode of wake flow pipe M9 of the source electrode of positive and negative input amplifier tube M1 and M2; M5, M6 and M7 are that the tail current circuit provides bias capability simultaneously, and M8, M9 and M10 constitute the tail current pipe, and R1 and C1 are tail current filter resistance and electric capacity.Bias current Ibias injects the drain electrode of tail current pipe M10, through connecting the tail current filter circuit filtering of M10 base stage, behind the low-pass filter circuit filtering radio-frequency component of R1 and C1 composition, exports a voltage signal relevant with input range.Wherein M5 ~ M7 is set to identical breadth length ratio; The breadth length ratio of while M8 is a times of M9, and it is identical with the size of current of M1 pipe to have guaranteed to flow through M3 like this, and the gain of entire circuit is just only managed relevant with the ratio of the breadth length ratio that M1 manages with M3; Wherein the M2 pipe is identical with the breadth length ratio of M1 pipe; M3 is identical with the breadth length ratio of M4 pipe, and irrelevant with temperature and technology, has guaranteed the ability of entire circuit opposing temperature and technique change; Make that under different temperatures and technique change the limited amplitude Amplifier Gain changes can be not too many.
Fig. 4 illustrates the DC maladjustment suppressor circuit figure that has LPF of the embodiment of the invention, and this circuit is a differential configuration.As shown in the figure: the DC maladjustment TVS that has LPF is made up of DC maladjustment TVS and low pass filter, and the DC maladjustment TVS comprises differential signal input pipe M1 and M2, difference DC maladjustment feedback signal input pipe M3 and M4; Load pipe M8 and M9 that diode connects; Transistor M5, M6 and the M7 of electric current are provided, tail current pipe M11, M12 and M13, bias current pipe; Be used to eliminate the low pass filter R1 and the C1 of noise; Ibias is from the electric current of reference current source, and M14～M16 and M17～M19 are active pull-up R3 and the R4 that is connected in parallel, and C2 is the big electric capacity that chip integration becomes with C3; Resistance R 3 and big capacitor C 2 constitute the P path filters greatly, R4 and and C3 formation N path filter.The DC maladjustment signal that DC maladjustment feedback signal Vosp exports after the filtering of P path filter is Vosp1; The DC maladjustment signal that DC maladjustment feedback signal Vosn exports after the filtering of N path filter is Vosn1; Corresponding DC maladjustment feedback signal Vosp1 and the Vosn1 of inserting of the grid of DC maladjustment signal input tube M3 and M4; The DC maladjustment signal amplifies back and DC maladjustment process M3 through input pipe M1 and M2, and the signal subtraction after M4 amplifies obtains not having the signal output of DC maladjustment.
The DC maladjustment TVS that has LPF suppresses circuit for adopting the feedback form DC maladjustment that has the LPF ability.This circuit comprises low pass filter and two parts of DC maladjustment subtracter.The DC maladjustment subtracter comprises that the input of first difference is to pipe M1 and M2; The source electrode parallel connection of M 1 and M2; The input of second difference is to pipe M3 and M4, and the source electrode of M3 and M4 is parallelly connected, and the drain electrode of M1 and M4 is in parallel; The drain electrode of M2 and M3 is in parallel, and the input of first difference is imported managing shared tail current pipe and biasing circuit the pipe and second difference.The input of first difference is to offset M5 and the M6 of pipe M1 and M2, and M5 and M6 are again the load pipe of each self-corresponding M1 and M2.The input of second difference is to corresponding Vosp1 and the Vosn1 of being connected of grid of pipe M3 and M4; One route cascade M14-M16 active pull-up becomes capacitor C 2 low pass filters to become capacitor C 3 low pass filters with chip integration with another route cascade M17-M19 active pull-up with chip integration; The corresponding connection from limiting amplifier output feedback signal Vosp and Vosn; The output signal of two-way low pass filter respectively do for oneself Vosp1 and Vosn1, Vosp1 and Vosn1 are by from limiting amplifier output feedback signal Vosp and the DC maladjustment signal of Vosn after the filtering of two-way active low-pass filter.The input of first difference is to the drain electrode of pipe M1 and M2; With second difference input drain electrode of pipe M3 and M4 is intersected corresponding being connected in parallel; To pipe M1, the DC maladjustment signal Vosp1 of signal code after M2 amplifies and difference input and Vosn1 import pipe M3 through second difference, the signal code after M4 amplifies through the input of first difference for differential input signal Vinn and Vinp; Drain electrode sys node is separately accomplished current subtraction; At M1 and M4 drain electrode sys node output end vo ut and M2 and M3 drain electrode sys node output end vo utp, obtain not having the output signal of DC maladjustment, realize DC maladjustment elimination function.
Fig. 5 provides the circuit diagram of the amplitude detection unit of the embodiment of the invention, and is as shown in the figure: amplitude detection unit is right by two asymmetric source coupled differential, and load current pipe and tail current biasing circuit constitute.Two asymmetric source coupled differential are to comprising that the first source coupled differential is to pipe M1 and M4; The second source coupled differential is to pipe M2 and M3; Two source coupled differential are identical to tubular construction; The first source coupled differential is dissymmetrical structure to the pipe and the second source coupled differential to two transistorized breadth length ratios of managing, and two pipe breadth length ratios are D
:1, it is right to constitute asymmetric source coupled differential; Two source coupled differential are to two P road input pipe M1 of pipe and the grid parallel connection access P road input signal of M3; Two source coupled differential are to two N road input pipe M4 of pipe and the grid parallel connection access N road input signal of M2; Two source coupled differential are to the source cross-coupled of the pipe corresponding load pipe that is connected in parallel; The source electrode parallel connection of M1 and M2 inserts load pipe M7, and the source electrode parallel connection of M4 and M3 inserts load pipe M8.The transistor of amplitude detection unit is for being fit to the three layer transistor structure of low-voltage technology, and its output current Iout is directly proportional with input voltage, is used to detect the amplitude size of input signal.The D value of embodiment is that 4, the first source coupled differential are 4 to the breadth length ratio and the second source coupled differential of managing M1 and M4 to the breadth length ratio of managing M2 and M3
:1; M7, M8 are the load current pipe, the transistor of the current subtraction of M9 after to be input voltage through the input pipe of two groups of different breadth length ratios amplify; M10 is the mirrored transistor of M9; The amplitude that provides output current to characterize input voltage is similar to the relevant electric current output of input range log-linear because uneven difference input pipe can provide, and utilizes this electric current through after the tail current pipe mirror image electric current relevant with the input signal amplitude log-linear can be provided with it.
The 3rd embodiment
Fig. 6 provides the circuit diagram of another embodiment of DC maladjustment TVS that has LPF, and its circuit constitutes except that the load pipe M8 and M9 that omit the diode connection, and is basic identical with Fig. 6.
This circuit comprises low pass filter and two parts of DC maladjustment subtracter.Low pass filter extracts through the DC component in the data after the amplification of next stage limiting amplifier.Low pass filter is made up of active pull-up and passive capacitive; Active pull-up is realized by the multi-stage cascade metal-oxide-semiconductor that is operated in linear zone; This resistance can be done very greatly, and shared area is smaller again, and relevant capacitance value can obtain smaller; Resistance and electric capacity can be realized on sheet like this, have practiced thrift chip cost.The subtracting each other of input and feedback signal input that has the signal in the DC maladjustment TVS of LPF is that opposite polarity circuit through two pairs of breadth length ratios and the identical input pipe of operating state constitute is realized; Feedback signal is input to after through the low pass circuit of being made up of active pull-up and passive capacitive amplifies output then and superposes with another output to input pipe that input signal is input in a pair of input pipe; But opposite in sign; The actual effect that plays is wanted to subtract exactly; So just be added to the DC maladjustment signal in the feedback in the signal with opposite symbol, played the purpose of filtering DC maladjustment.
Following to the process prescription of the detection input signal amplitude of the amplitude detection circuit of Fig. 2 b band DC maladjustment elimination of the present invention function below in conjunction with Fig. 3, Fig. 4 and Fig. 5: it is 4 that M is set, and then N is 5.
Differential input signal Vinn and Vinp are input to the differential input end of first order amplitude detection unit 209, and the input signal that amplifies without amplitude limit detects through amplitude detection unit 209, and the output amplitude signal is converted into electric current, delivers to current adding circuit 214.Differential input signal Vinn and Vinp are input to the 1st grade of differential input end that has the DC maladjustment TVS 201 of LPF simultaneously; The input signal of input signal after 201 LPF and DC maladjustment suppress; Sending thereafter the 1st grade of limiting amplifier 202 to make the 1st grade of limit puts; The differential output signal Vosn of the 1st grade of limiting amplifier 202 and Vosp feedback are input to the 1st grade of differential feedback input that has the DC maladjustment TVS 201 of LPF; The differential input signal of differential feedback input signal and DC maladjustment TVS 201 is through the signal subtraction behind the LPF, and this filtered signal is exactly the DC maladjustment signal in the input signal, through subtracting each other the elimination effect; Offset the DC maladjustment composition in the input circuit, thereby prevent that late-class circuit is saturated.Not not amplifying through the 1st grade of limiting amplifier 202 of 201 outputs with the signal of DC maladjustment; Wherein small-signal will directly amplify; And large-signal will be limited and no longer amplification; The output of limiting amplifier 202 is input to the 2nd grade of amplitude detection unit 210 again, can detect the size of output input signal amplitude through 210 asymmetric differential pairs, and be translated into current signal; This conversion is to obtain the current signal that a size with input signal amplitude presents log-linear through current mirror circuit, and the current signal of the 2nd grade of amplitude detection unit 210 outputs is delivered to current adding circuit 214.The 2nd grade of DC maladjustment TVS 203 that has LPF delivered in the output of the 1st grade of limiting amplifier 202; The effect of the 2nd grade of DC maladjustment TVS 203 that has a LPF, the 2nd grade of limiting amplifier 204 and 3rd level amplitude detection unit 211 and the effect of aforementioned circuit 201,202 and 210 are identical; Eliminate the DC maladjustment of back level; Once more small-signal is amplified, large-signal will be limited, and deliver to current adding circuit 214 to current signal.By that analogy; Repeat said process 4 times; Final making needs the small-signal of detection to be amplified fully up to saturated, and the minimum radius accuracy of detection of input signal depends on the size that is amplified to saturated minimum signal, and 4 limiting amplifiers are amplified to input signal saturated.Amplitude detection unit 210 ~ 213; Separately with respective detection to range signal be converted into electric current and be input to current adding circuit 214; Make the output signal after addition is handled through current adding circuit 214; Through the low-pass filter circuit filtering of R1 and C1 formation, obtain the output voltage of ability reflected input signal amplitude again, accomplish input signal amplitude.The dynamic range that the band DC maladjustment is eliminated the amplitude detection circuit detection input signal of function depends on the product that a plurality of limiting amplifiers 202,204,206 and 208 gain.The different log-linears that also are similar in regular turn of the breadth length ratio example of the differential pair tube of amplitude detection unit at different levels change; The size of each amplitude detection unit output current also can be different in regular turn, and each amplitude detection unit output current is log-linear variation in regular turn with the changes in amplitude of input signal.Each the amplitude detection unit output current of amplitude detection circuit and the relation of signal input range are the log-linear relations; Be big or small linear after the amplitude of size and the input signal of output voltage is taken the logarithm, realize that the output current sum of each amplitude detection unit and input signal amplitude are approximate log-linear relations.
The band DC maladjustment is eliminated the amplitude detection circuit of function, is used for radio-frequency transmitter, is applied to the demodulator circuit of zero intermediate frequency circuit, satisfies the requirement of system multi-frequency wide band radio-frequency chip.
A kind of amplitude detection module application of eliminating function with DC maladjustment that Fig. 7 has provided the embodiment of the invention realizes the output amplitude input in radio-frequency transmitter, and the circuit that is used for FEEDBACK CONTROL front end variable gain circuit connects schematic block diagram.The amplitude detection circuit that amplitude detection module 77 is eliminated for the band DC maladjustment; Radiofrequency signal input amplifier circuit in low noise 71; Through PGA variable gain radio frequency amplifier 73, close 76 mixing via down-conversion mixer 75 more again, the radio-frequency component of mixing output in low pass filter 78 and 79 filtering down-conversion mixers output signal; Be amplified to the required stable intermediate-freuqncy signal of base band demodulating through simulation automatic gain control circuit 710 and 711 again, input base band demodulating chip.Amplitude detection module 77 of the present invention detects the amplitude size of low pass filter 78 output signals; To detect output voltage and offer gain control module 72; Gain control module 72 compares voltage signal that obtains and reference voltage; Produce two groups of control signals and control the gain of 71 low noise amplifiers 71 and variable gain radio frequency amplifier 73 respectively, the excessive saturated or too small signal to noise ratio that causes exporting is low excessively thereby the gain size of regulating radio-frequency front-end system prevents the gain of radio-frequency front-end.Among the figure 74 the two-way quadrature is provided intrinsic signals to frequency mixer 76; 78; Wherein the topmost effect played of amplitude detection module is exactly the amplitude information that detects the signal of intermediate frequency, transfers information of voltage to and offers gain control module and handle, owing to be that zero intermediate frequency system requires lower cut-off frequency; The amplitude detection module 77 that the band DC maladjustment that chip integration of the present invention becomes is eliminated function just plays DC maladjustment elimination function; The amplitude detection circuit operate as normal under the prerequisite that satisfies system low-voltage work, HDR and low cost, high stable, is accomplished the amplitude detection function.
A kind of amplitude detection circuit that utilizes the band DC maladjustment to eliminate that Fig. 8 provides the embodiment of the invention is applied to the connection sketch map that amplitude is monitored demodulator circuit.
The intermediate-freuqncy signal of amplitude monitoring is through 81 amplitude detection modules of the present invention; Obtain a voltage change signal relevant with input range voltage; This signal is through filtering radio-frequency component wherein behind 82 low pass filters; This signal again through a low-pass filter network of forming by resistance R 1 and C1 therewith signal directly compare, the result who compares i.e. amplitude monitoring circuit output signal for this reason.Because the general frequency spectrum of amplitude pilot signal is all than broad and be zero intermediate frequency signals; So the DC maladjustment among the present invention is eliminated circuit and can be guaranteed amplitude detection module operate as normal and can not increase extra pin; The amplitude detection unit that is applied to low pressure among the present invention owing to generally all being used for low-pressure designs, this system lower power consumption can be arranged simultaneously, so can guarantee that the function of amplitude detection module is normal to guarantee other modules.The present invention who is applied in the present embodiment can well play amplitude detection, eliminates the effect of DC maladjustment signal.
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 (9)
1. eliminate the amplitude detection circuit of function with DC maladjustment for one kind, it is characterized in that the circuit of chip integration one-tenth, multi-stage cascade, differential configuration constitutes:
A DC maladjustment that comprises the DC maladjustment TVS of M level band LPF suppresses circuit;
An amplitude restriction amplifying circuit that comprises M level limiting amplifier;
An amplitude detection circuit that comprises N level amplitude detection unit, N are M+1; And
A current adding circuit; With
A low-pass filter circuit;
Difference censorship is surveyed input signal connecting band DC maladjustment and is eliminated the differential input end of DC maladjustment TVS that the amplitude detection circuit differential input end of function comprises differential input end and the first order band LPF of the first order amplitude detection unit that is connected in parallel; The corresponding difference output end that connects the DC maladjustment TVS of first order band LPF of the differential input end of first order limiting amplifier; Its differential output signal feeds back to the differential feedback input of the DC maladjustment TVS of first order band LPF; And the corresponding differential input end of next stage amplitude detection unit and the differential input end of the DC maladjustment TVS that next stage has LPF of connecting, multi-stage cascade connects successively; The output of every grade of amplitude detection unit connects an input of current adding circuit; The current adding circuit output connects low pass filter and amplitude detection output is provided, and is used for the interior difference that realizes of sheet and inspects the elimination and the amplitude detection of the DC maladjustment of surveying input signal by ready samples.
2. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 1, it is characterized in that: described amplitude restriction amplifying circuit comprises M level limiting amplifier, and the span of M is 3～6; The circuit structure of every grade of limiting amplifier is identical; Every grade of limiting amplifier input is connected in series with DC maladjustment TVS output with one-level band LPF separately; The be connected in series input of DC maladjustment TVS of next stage band LPF of the output of every grade of limiting amplifier is used to offset the DC maladjustment that the DC maladjustment TVS of prime band LPF causes.
3. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 2, it is characterized in that: to pipe, load pipe and tail current pipe and bias current circuit constitute said limiting amplifier by input, and the load pipe is the metal-oxide-semiconductor that collapsible diode connects; Limiting amplifier is a fixed gain amplifier, and its yield value is confirmed by the breadth length ratio of the load metal-oxide-semiconductor that the breadth length ratio of importing metal-oxide-semiconductor is connected with collapsible diode; Be used to realize that large-signal and small-signal can both satisfy the detection requirement of amplitude detection unit.
4. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 1; It is characterized in that: the DC maladjustment TVS of said band LPF is that the reaction type DC maladjustment with LPF suppresses circuit, comprises the low pass filter and the DC maladjustment TVS that are connected in series; Wherein
Said low-pass filter circuit is made up of active pull-up and passive capacitive; Active pull-up is the multi-stage cascade metal-oxide-semiconductor; Each metal-oxide-semiconductor is operated in linear zone, is used for to realize big resistance resistance than small size, and the passive capacitive of smaller capacitive value constitutes low pass filter; On sheet, realize, practice thrift chip area and cost;
The feedback input end of said DC maladjustment TVS connects the limiting amplifier output, constitutes DC maladjustment and suppresses feedback loop; Be used for low pass filter is extracted the DC component of the data after amplifying through the next stage limiting amplifier,, offset the DC maladjustment composition in the limiting amplifier circuit with the output signal subtraction of the limiting amplifier of prime.
5. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 4, it is characterized in that: said DC maladjustment TVS is a subtraction device, comprises the input of first difference to pipe, and the input of second difference is to pipe, and tail current pipe and biasing circuit; The input of each difference is to the source electrode parallel connection of pipe, and the input of first difference intersects corresponding parallel connection to two drain electrodes of pipe and the input of second difference to two drain electrodes of pipe, and first difference is imported managing and second difference is imported managing shared tail current pipe and biasing circuit; First difference of subtracter is imported the low-pass filter circuit output that the input of pipe is connected DC maladjustment TVS at the corresponding levels, and the input of second difference connects with one-level limiting amplifier output the input of pipe; The input of first and second difference is identical to the breadth length ratio and the operating state of pipe, and is opposite to the current polarity of the drain electrode alter-parallel node of pipe at first and second input differences; Be used for realizing suppressing DC maladjustment.
6. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 1; It is characterized in that: said amplitude detection circuit is made up of N level amplitude detection unit; First order amplitude detection unit input connects censorship and surveys the input signal end; Thereafter the input of every grade of amplitude detection unit connects the output of corresponding upper level limiting amplifier; The corresponding input that connects current adding circuit of the output of each amplitude detection unit is used to the current amplitude that current adding circuit provides N detection signal, realizes the current amplitude addition of N detection signal.
7. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 6, it is characterized in that: said amplitude detection unit by two asymmetric source coupled differential to pipe, two load current pipes, image current pipe and tail current biasing circuit constitute; Wherein
Said two asymmetric source coupled differential comprise that to pipe the first source coupled differential is to pipe; The second source coupled differential is to pipe; Two source coupled differential are identical to tubular construction, and two transistorized breadth length ratios that two source coupled differential are right are asymmetric, and it is right to constitute asymmetric source coupled differential; Two source coupled differential are to the parallelly connected P road input signal that inserts of the grid of two P road input pipes of pipe; Two source coupled differential insert N road input signal to the grid parallel connection of two N road input pipes of pipe, and two source coupled differential are to the source cross-coupled of the pipe corresponding load pipe that is connected in parallel;
The transistor of amplitude detection unit is for being fit to the three layer transistor structure of low-voltage technology, and its output current Iout is directly proportional with input voltage, is used to detect the amplitude size of input signal.
8. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 7, it is characterized in that: said two asymmetric source coupled differential are right to being adjustable asymmetric source coupled differential, and the first source coupled differential is D to two transistor breadth length ratios of pipe
:1, the second source coupled differential also is D to two transistor breadth length ratios of pipe
:1, the span of D is 2～8, is used in span, regulating two transistor breadth length ratio D values through technology, obtains the Optimization result value, makes the error of amplitude quantizing little and low in energy consumption, reaches the application system circuit requirement.
9. eliminate the amplitude detection circuit of function according to the said band DC maladjustment of claim 1-8; It is characterized in that: the differential pair tube of each amplitude detection unit is the breadth length ratio dissymmetrical structure in the said detected amplitude circuit; Differential pair tube is that breadth length ratio is different because of ratio; Output current is different with the breadth length ratio example difference of differential pair tube, the different and variation in regular turn of the breadth length ratio example of the differential pair tube of each amplitude detection unit, and the log-linear that is similar in regular turn of the breadth length ratio example of differential pair tube changes; The size of each amplitude detection unit output current also can be different in regular turn, and each amplitude detection unit output current is log-linear variation in regular turn with the changes in amplitude of input signal.
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