CN102571227B - Amplitude detection circuit with direct current offset elimination function - Google Patents
Amplitude detection circuit with direct current offset elimination function Download PDFInfo
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- CN102571227B CN102571227B CN201110353147.5A CN201110353147A CN102571227B CN 102571227 B CN102571227 B CN 102571227B CN 201110353147 A CN201110353147 A CN 201110353147A CN 102571227 B CN102571227 B CN 102571227B
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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 technique, the change in signal strength scope of the input signal of the radio-frequency front-end of various receiver systems is all very large, so need to guarantee under the prerequisite of the error rate that the intensity that receives signal by detection controls the gain of variable gain amplifier, to reach power ratio control intensity, avoid the saturation of receiver, obtain stable output signal strength.
As everyone knows, modern system requires more and more higher to the integrated level of system, DC maladjustment has become the inevitable problem of employing zero intermediate frequency reciver simultaneously, and the DC maladjustment of prior art receiver system elimination function is all the performance that needs outside original paper to obtain.And the amplitude detection unit of existing receiver is all generally by the structure of Gilbert cell rectifier simultaneously, the amplitude detection unit of this structure needs four-layer transistor stacking, 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 as shown in Figure 1, signal is amplified to saturated by 102 ~ 105 amplifier, by 106 to 110, the output amplitude of every one-level amplifier is detected and transfers current signal to respectively again, the output current of every grade is via direct current adder circuit, the last low-pass filter circuit of process is again exported final voltage, applicable input signal dynamic range is lower.The elimination of DC maladjustment is by resistance R 1, and R2 and capacitor C 1 and feedback subtracter 101 are realized.Because capacitor C 1 needs capacitance too large, must adopt the outer electric capacity of sheet.
There is shortcomings in the rf gain amplifier of prior art: the first, and the amplitude detection unit that radio frequency amplifier adopts is all not suitable for low pressure applications.The second, can not be adapted to the system that needs high dynamic range and have strong signal input requirements.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, the design difficulty of entirety strengthens, and reduces the stability of signal.
If there is a kind of amplitude detection circuit of eliminating function with DC maladjustment, DC maladjustment can be eliminated simultaneously to the extra pin of unnecessary increase again, improve amplitude detection unit simultaneously and be applicable to low pressure applications, just can increase its application scenario, coordinate the amplitude control function of more radio frequency chip, the flexibility of whole radio-frequency front-end is improved 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 technology for radio frequency field, relate to a kind of amplitude detection circuit, relate in particular to the amplitude detection circuit of eliminating function with DC maladjustment, for radio-frequency transmitter.
Summary of the invention
The object of the invention is to be not suitable for low pressure applications, to adopt the outer electric capacity of sheet and cost increase to reduce again the defect of signal stabilization for solving above-mentioned that prior art radio frequency receiver front end forms, provide a kind of Embedded to have DC maladjustment to eliminate the amplitude detection circuit of circuit, it is for radio-frequency transmitter, both can realize the function of the amplitude detection to input signal, can suppress the DC maladjustment of circuit itself simultaneously, be applicable under operating on low voltage condition, the amplitude of the input signal to wide region is carried out log-linear quantification.Be integrated in the amplitude detection circuit with DC maladjustment elimination function in a slice, can meet low pressure applications occasion, the function and the DC maladjustment that possess amplitude detection circuit are eliminated function simultaneously, 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 by technical scheme below:
An amplitude detection circuit of eliminating function with DC maladjustment, the circuit of its Embedded, multi-stage cascade, differential configuration is configured to:
A DC maladjustment that comprises the DC maladjustment inhibitor of M level with low-pass filtering suppresses circuit;
One comprises the amplitude limitation amplifying circuit of M level limiting amplifier;
One comprises the amplitude detection circuit of N level amplitude detection unit, and N is 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 that the amplitude detection circuit differential input end of function comprises the differential input end of the first order amplitude detection unit being connected in parallel and the DC maladjustment inhibitor of first order band low-pass filtering; The difference output end of the corresponding DC maladjustment inhibitor that connects first order band low-pass filtering of differential input end of first order limiting amplifier, its differential output signal feeds back to the differential feedback input of the DC maladjustment inhibitor of first order band low-pass filtering, and the corresponding differential input end that connects next stage amplitude detection unit and next stage be with the differential input end of the DC maladjustment inhibitor of low-pass filtering, multi-stage cascade connects successively; The output of every grade of amplitude detection unit connects an input of current adding circuit, current adding circuit output connects low pass filter and amplitude detection output is provided, and surveys elimination and the amplitude detection of the DC maladjustment of input signal for realizing difference censorship in sheet.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that described amplitude limitation amplifying circuit comprises M level limiting amplifier, 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 the DC maladjustment inhibitor output of same one-level band low-pass filtering separately, the output of every grade of limiting amplifier is connected in series the input of the DC maladjustment inhibitor of next stage band low-pass filtering, the DC maladjustment causing for offsetting the DC maladjustment inhibitor of prime band low-pass filtering.
By peer, with the DC maladjustment circuit of low-pass filtering, DC maladjustment component is separated, the DC maladjustment in exporting with the DC maladjustment inhibitor of prime band low-pass filtering offsets, and advances successively, realizes the object of whole amplitude detection circuit elimination DC maladjustment.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that described limiting amplifier is by inputting pipe, and load pipe and tail current pipe and bias current circuit form, and load pipe is the metal-oxide-semiconductor that collapsible diode connects; Limiting amplifier is fixed gain amplifier, and the breadth length ratio of the load metal-oxide-semiconductor that its yield value is connected with collapsible diode by the breadth length ratio of inputting metal-oxide-semiconductor is determined; For realizing large-signal and small-signal, can meet the testing requirement of amplitude detection unit.
Limiting amplifier limits excessive signal amplitude in amplification input signal, make small-signal and the large-signal output signal after limited range enlargement within the detection range of amplitude detection unit, realize large-signal and small-signal and can meet the testing requirement of amplitude detection unit.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is to comprise the low pass filter and the DC maladjustment inhibitor that are connected in series; Wherein
Described low-pass filter circuit consists of active pull-up and passive capacitive, active pull-up is multi-stage cascade metal-oxide-semiconductor, each metal-oxide-semiconductor is operated in linear zone, for with compared with the large resistance resistance of small area implementation, the passive capacitive of small electric capacitance forms low pass filter, on sheet, realize, save chip area and cost;
The feedback input end of described DC maladjustment inhibitor connects limiting amplifier output, forms DC maladjustment and suppresses feedback loop; For low pass filter is extracted to the DC component of data after next stage limiting amplifier amplifies, subtract each other with the output signal of the limiting amplifier of prime, offset the DC maladjustment composition in limiting amplifier circuit.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that described DC maladjustment inhibitor is subtraction device, comprises that the first difference input is to pipe, the second difference input is to pipe, and tail current pipe and biasing circuit; Each difference is inputted the source electrode parallel connection to pipe, and the first difference input intersects corresponding in parallel to two of pipe drain electrodes to two of pipe drain electrodes and the second difference input, and the first difference input shares tail current pipe and biasing circuit to pipe and the input of the second difference to managing; The first difference input of subtracter connects the low-pass filter circuit output of DC maladjustment inhibitor at the corresponding levels to the input of pipe, the second difference input connects with one-level limiting amplifier output the input of pipe; The first and second difference inputs are identical with operating state to the breadth length ratio of pipe, and the current polarity of the drain electrode alter-parallel node at the first and second input differences to pipe is contrary; Be used for realizing inhibition DC maladjustment.
Input and subtracting each other of feedback signal input with the signal in the DC maladjustment inhibitor of low-pass filtering are that the opposite polarity circuit consisting of two pairs of breadth length ratios and the identical input pipe of operating state is realized, signal input part access low-pass filter circuit output signal of subtracter, another signal input part access limiting amplifier output signal, input is identical with operating state to pipe breadth length ratio, polarity is contrary, for realizing inhibition DC maladjustment.Feedback signal is input to another output to input pipe of amplifying in a pair of input pipe that then output and input signal be input to after by the low-pass filter circuit being comprised of active pull-up and passive capacitive and superposes, but is-symbol is contrary, the effect that playing property subtracts, so just the DC maladjustment signal in feedback is added in signal with contrary symbol, has played the object of filtering DC maladjustment.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that described amplitude detection circuit is comprised of N level amplitude detection unit, first order amplitude detection unit input connects censorship and surveys 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 output of each amplitude detection unit, be used to current adding circuit that the current amplitude of N detection signal is provided, the current amplitude of realizing N detection signal is added.
Difference radio-frequency signal is amplified to saturated via the limiting amplifier of cascade, then the amplitude size of amplitude detection unit output detections is all passed through in the output of every grade, the size detecting according to amplitude detection circuit is added via current adding circuit again, then after low-pass filter circuit filtering, just obtains the output voltage relevant to input signal amplitude.
Describedly with DC maladjustment, eliminate the amplitude detection circuit of function, its be described amplitude detection unit by two asymmetric source coupled differential to pipe, two load current pipes, image current pipe and tail current biasing circuit form; Wherein
Described 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, form asymmetric source coupled differential pair; Two source coupled differential are to the grid of two of pipe P road input pipes access in parallel P road input signal, two source coupled differential are to the grid of two of pipe N road input pipes access in parallel N road input signal, 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 the three layer transistor structure that is applicable to low-voltage technique, and its output current Iout is directly proportional to input voltage, for detection of the amplitude size of input signal.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that described two asymmetric source coupled differential are to being adjustable asymmetric source coupled differential pair, the first source coupled differential is D to two of pipe transistor breadth length ratios
:1, the second source coupled differential is also D to two of pipe transistor breadth length ratios
:the span of 1, D is 2～8, for regulate two transistor breadth length ratio D values in span by technique, obtains optimum results value, makes the error of amplitude quantizing little and low in energy consumption, reaches application system circuit requirement.
Detected amplitude circuit is that the difference of the breadth length ratio to pipe by input difference obtains and inputs 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 the result that has adopted optimal design, can make error reach minimum.Doubly, the span of D is 2～8 to the D that two-way input is breadth length ratio to pipe breadth length ratio; Subtraction transistor makes the current subtraction of input voltage after the input pipe of two different breadth length ratios amplifies, and by the transistorized mirrored transistor of subtraction, provides the output current that characterizes input voltage amplitude.As preferentially, D value is 4.
The described amplitude detection circuit of eliminating function with DC maladjustment, it is that the differential pair tube of each amplitude detection unit in described detected amplitude circuit is breadth length ratio dissymmetrical structure, differential pair tube is that breadth length ratio is because of ratio difference, output current is different and different with the breadth length ratio example of differential pair tube, the different also sequentially variations of breadth length ratio example of the differential pair tube of each amplitude detection unit, the log-linear that is sequentially similar to of the breadth length ratio example of differential pair tube changes; The size of each amplitude detection unit output current also can be sequentially different, and each amplitude detection unit output current is sequentially log-linear variation with the changes in amplitude of input signal.
Each amplitude detection unit output current of amplitude detection circuit and the relation of signal input range are log-linear relations, be that size after the size of output voltage and the amplitude of input signal are taken the logarithm is linear, output current sum and the input signal amplitude of realizing each amplitude detection unit are approximate log-linear relations.
Described limiting amplifier circuit, by several limiting amplifiers, formed, the amplifier architecture of each limited amplitude is to adopt metal-oxide-semiconductor that the diode of folded form connects as load, and gain is all the breadth length ratio that is decided by input the metal-oxide-semiconductor that the wide length of metal-oxide-semiconductor is connected with diode.
Described amplitude detection unit is comprised of several amplitude detection unit, and the input of each amplitude detection unit connects the output of a limiting amplifier, and the output of each amplitude detection unit simultaneously connects the input of current adding circuit.The effect of each amplitude detection unit is the amplitude that detects input voltage, transfers its range signal to current signal.Each amplitude detection unit comprises two pairs of non-equilibrium source coupled differential pair of coming round, two transistorized breadth length ratio ratios that source coupled differential is right are D, the output current Iout of this structure is directly proportional to input voltage, and only has three layer transistor, is applicable to low-voltage technique.
The input of each limiting amplifier is connected with the output with the DC maladjustment inhibitor of low-pass filtering, the output of each limiting amplifier connects the input of an amplitude detection unit and the next DC maladjustment inhibitor with low-pass filtering, 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, then the amplitude size of amplitude detection unit output detections is all passed through in the output of every grade, the size detecting according to amplitude detection circuit is added via current adding circuit again, then after low-pass filter circuit filtering, just obtains the output voltage relevant to input signal amplitude.
During the described DC maladjustment inhibitor with low-pass filtering, adopt with the feedback form DC maladjustment of low-pass filtering ability and suppress circuit.This circuit comprises low pass filter and two parts of DC maladjustment subtracter.Low pass filter extracts the DC component in the data after next stage limited range enlargement unit amplifies.Low pass filter consists 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 do very greatly, shared area is smaller again, corresponding capacitance can be obtained smaller, resistance and electric capacity can be realized on sheet like this, have saved chip cost.
Subtracting each other of the described input with the signal in the DC maladjustment inhibitor of low-pass filtering and feedback signal input is that the opposite polarity circuit consisting of two pairs of breadth length ratios and the identical input pipe of operating state is realized, feedback signal is input to another output to input pipe of amplifying in a pair of input pipe that then output and input signal be input to after by the low pass circuit being comprised of active pull-up and passive capacitive and superposes, but is-symbol is contrary, the actual effect playing is wanted to subtract exactly, so just the DC maladjustment signal in feedback is added in signal with contrary symbol, played the object of filtering DC maladjustment.
Described amplitude detection unit is that the difference of the breadth length ratio right by input difference obtains and inputs 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 the result that has adopted optimal design, can make error reach minimum, in order to meet the requirement of low voltage designs, adopted single tube tail current structure, be better than traditional laminated type tail current structure simultaneously.
The present invention overcome DC maladjustment in prior art structure eliminate circuit can not be completely in the shortcoming of Embedded and inapplicable operating on low voltage, this radio frequency chip can be realized improving integrated level, saved outer member, circuit overhead and power consumption have been reduced, the performance of raising system, and the sensitivity of radio-frequency transmitter etc., can also reduce thus equipment power dissipation and volume, cost-saving.The present invention is applicable to the radio frequency chip of multiple frequency broad band, is particularly suitable for reducing the outer device of sheet, increases the workplace of the dynamic range of input signal.Both met market requires more and more higher and output voltage stabilization demand to the integrated level of radio frequency chip, reduced again circuit complexity, improved stability, met under the prerequisite of correct detection signal amplitude, improved the dynamic range of system simultaneously.DC maladjustment is eliminated circuit and is integrated in sheet, can adapt to the requirement of chip miniaturization high integration, can adapt to 1.8V operating on low voltage, saves 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 by single tail current pipe belt, can well be adapted to the occasion of low voltage application, the decreased number that adopts pipe, can adapt to 1.8V operating on low voltage, meets 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, there is 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 technique, the ability of whole circuit opposing temperature and technique change is strong, gains small with temperature and technique change, and the requirement that is applicable to being applied to needs high dynamic range and has strong signal to input.
3, low-pass filter circuit of the present invention and DC maladjustment are eliminated in circuit integration slice, circuit structure is without peripheral components, reduce chip area and system cost, amplitude detection unit adopts adjustable asymmetric source coupled differential pair, be conducive to technique and adjust the D value of 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, meets the requirement of system multi-frequency wide band radio-frequency chip.
Accompanying drawing explanation
Fig. 1 is the amplitude detection circuit of prior art;
In 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 that the amplitude detection circuit of eliminating with DC maladjustment of first embodiment of the invention forms block diagram;
In Fig. 2 a: 21-DC maladjustment suppresses circuit, 22-amplitude limitation amplifying circuit, 23-amplitude detection circuit, 24-current adding circuit, 25-low-pass filter circuit.
Fig. 2 b is that the amplitude detection circuit of eliminating with DC maladjustment of second embodiment of the invention forms block diagram;
In Fig. 2 b: 201,203,205,207-DC maladjustment inhibitor with low-pass filtering, 202,204,206,208 limiting amplifiers, 209～213-amplitude detection unit, 214-current adding circuit, R1 is low-pass filtering resistance, C1 is low-pass filtering electric capacity.
Fig. 3 is the circuit principle of compositionality figure of the limiting amplifier of the embodiment of the present invention;
In 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 with low-pass filtering of embodiment of the present invention differential configuration;
In 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 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 transistor that M14 ~ M19-active pull-up connects, C2, the large electric capacity of C3-Embedded, Vosp and the output of Vosn-difference DC maladjustment signal.
Fig. 5 is the circuit diagram of the amplitude detection unit of the embodiment of the present invention;
In Fig. 5: M1 ~ M4 is input pipe, wherein M1, the breadth length ratio of M2 is M3, the D of M4 times, M7, M8-load current pipe, M9-current subtraction transistor, the mirrored transistor of M10-M9.
Fig. 6 is the DC maladjustment suppressor circuit figure with low-pass filtering of the differential configuration of another embodiment of the present invention;
In Fig. 6: M1, M2-input pipe, M3, the input pipe of M4-DC maladjustment feedback, M5, M6, M7-the 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-large electric capacity, Vosp and the output of Vosn-difference DC maladjustment signal.
Fig. 7 be the embodiment of the present invention with DC maladjustment, eliminate the LNA outside amplitude detection module and the sheet of function, PGA and frequency mixer are connected schematic block diagram with filter;
In Fig. 7: 71-single-ended LNA circuit, 72-digital gain control module, 73-single-ended transfer difference gain configurable module PGA, 74-phase-locked loop circuit, 75,76-mixer module, the amplitude detection circuit that 77-amplitude detection module is 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 a kind of utilization of the embodiment of the present invention is applied to amplitude monitoring demodulator circuit connection layout with the amplitude detection circuit of DC maladjustment elimination;
In Fig. 8: 81-with DC maladjustment eliminate amplitude detection circuit, 82-low pass filter, 83-comparator.
Embodiment
Below by embodiment also by reference to the accompanying drawings, technical scheme of the present invention is further described in detail.
The first embodiment
The amplitude detection circuit with DC maladjustment elimination function that Fig. 2 a has provided the embodiment of the present invention forms block diagram.The amplitude detection circuit of eliminating function with DC maladjustment suppresses circuit 21, the amplitude limitation amplifying circuit 22 that comprises M level limiting amplifier, the amplitude detection circuit 23 that comprises N level amplitude detection unit, current adding circuit 24 and filter 25 by the DC maladjustment that comprises the DC maladjustment inhibitor of M level with low-pass filtering and forms.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 first order amplitude detection unit and the differential input end of the DC maladjustment inhibitor of first order band low-pass filtering, the difference output end of the corresponding DC maladjustment inhibitor that connects first order band low-pass filtering of differential input end of first order limiting amplifier, its differential output signal feeds back to the difference control end of DC maladjustment inhibitor of first order band low-pass filtering the corresponding differential input end that connects next stage amplitude detection unit and the next stage differential input end with the DC maladjustment inhibitor of low-pass filtering, multi-stage cascade successively, the output of every grade of amplitude detection unit connects the input of current adding circuit, current adding circuit output connects low pass filter and amplitude detection output is provided, for realizing the elimination of amplitude detection and the DC maladjustment of input signal in sheet.First input signal carries out amplitude detection by first amplitude detection unit, formation current signal after detection inputs to current adding circuit, because input signal also needs to amplify by first order limiting amplifier, if directly by M level limiting amplifier, the flip-flop in input signal also can be because the effect of amplifying be by saturated whole signal link, for making input signal link not because DC maladjustment composition is saturated, need to first eliminate the DC maladjustment composition in circuit, input signal first by one-level band low-pass filtering DC maladjustment inhibitor, this inhibitor is utilized limiting amplifier to be output as feedback signal and is obtained a feedback DC component, feedback DC component and input signal are subtracted each other through the DC component of low-pass filtering, obtain an input signal that suppresses DC maladjustment composition, again this input signal is amplified by limiting amplifier, can avoid DC maladjustment composition to cause limiting amplifier saturated.For making each limiting amplifier, can normally work, at the input of each limiting amplifier, add a DC maladjustment inhibitor with low-pass filtering, for detecting the amplitude size of each limiting amplifier output signal, in each limiting amplifier output, connect an amplitude detection unit.By that analogy, repeat said process M time, finally make to need the small-signal detecting to be amplified fully until saturated, 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 by current adding circuit 24 accumulation process, the output of current adding circuit 24 is again by low pass filter 25 filtering, high frequency clutter component in filtered signal, obtain a voltage signal that comprises input signal amplitude information, complete input signal amplitude and detect.
The second embodiment
The amplitude detection circuit with DC maladjustment elimination function that Fig. 2 b has provided the embodiment of the present invention forms block diagram.It is 4, N=M+1 that M is set.The amplitude detection circuit with DC maladjustment elimination function of embodiment comprises the 1st grade of the-the 4th grade of DC maladjustment inhibitor 201,203,205 and 207 with low-pass filtering, 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.In conjunction with amplitude detection function in Fig. 2 b explanation the present invention, realize:
Differential input signal Vinn and Vinp are input to the DC maladjustment inhibitor 201 of the first order with low-pass filtering, while is passed through the signal subtraction after low-pass filtering with the output of the limiting amplifier of rear class electric current, filtered characterization wherein the DC maladjustment composition size in output signal, thereby the DC maladjustment composition that can offset in input circuit by this elimination effect prevents that late-class circuit is saturated, the signal with DC maladjustment does not amplify by 202 amplitude-limiting circuits, 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, by the right effect of uneven difference, can detect the size of output input signal amplitude, and transferred to current signal, finally by current mirror circuit, obtain one and present the current signal of log-linear with the amplitude of signal, the output of amplitude detection circuit 202 simultaneously connects the 203 DC maladjustment inhibitor with low-pass filtering, 201 effect before being similar to, eliminate the DC maladjustment of rear class, by repeating above-mentioned process, finally make for N time to need the small-signal detecting to be amplified fully until saturated, the detected amplitude of minimum input signal is decided by be amplified to saturated minimum signal magnitude, limiting amplifier by input signal be amplified to saturated after, the electric current that 209 ~ 213 amplitude detection unit transform the range signal detecting is separately input to current adding circuit 214, the output of current adding circuit 214 obtains the finally output voltage of energy reflected signal amplitude through the filtering of R1 and C1.The dynamic range of the signal that can detect depends on 202,204, and the gain of 206,208 these range detectors is long-pending.
Fig. 3 provides the circuit principle of compositionality figure of the limiting amplifier of the embodiment of the present invention.As shown in Figure 3: M1 and M2 are positive input amplifier tube and negative input amplifier tube, the base stage of positive and negative input amplifier tube M1 and M2 corresponding access input signal Vinn and Vinp, 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 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 provide bias capability for tail current circuit simultaneously, and M8, M9 and M10 form 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, after the low-pass filter circuit filtering radio-frequency component of R1 and C1 composition, exports a voltage signal relevant to input range.Wherein M5 ~ M7 is set to identical breadth length ratio, simultaneously the breadth length ratio of M8 is M9 one times, guaranteed like this to flow through M3 identical with the size of current of M1 pipe, the gain of whole circuit is just only relevant with the ratio of the breadth length ratio of M3 pipe and M1 pipe, wherein M2 pipe is identical with the breadth length ratio of M1 pipe, M3 is identical with the breadth length ratio of M4 pipe, and it is irrelevant with temperature and technique, guaranteed the ability of whole circuit opposing temperature and technique change, make under different temperatures and technique change, the change in gain of limited amplitude amplifier can be not too many.
Fig. 4 illustrates the DC maladjustment suppressor circuit figure with low-pass filtering of the embodiment of the present invention, and this circuit is differential configuration.As shown in the figure: the DC maladjustment inhibitor with low-pass filtering consists of DC maladjustment inhibitor and low pass filter, DC maladjustment inhibitor 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, the transistor M5 of electric current is provided, M6 and M7, tail current pipe M11, M12 and M13, bias current pipe, for eliminating low pass filter R1 and the C1 of noise, Ibias is from the electric current of reference current source, M14～M16 and M17～M19 are active pull-up R3 and the R4 being connected in parallel, C2 and C3 are the large electric capacity of Embedded, large resistance R 3 and large capacitor C 2 form P path filter, 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, grid corresponding access DC maladjustment feedback signal Vosp1 and the Vosn1 of DC maladjustment signal input tube M3 and M4, DC maladjustment signal passes through M3 with DC maladjustment after input pipe M1 and M2 amplification, signal subtraction after M4 amplifies, obtains not having the signal output of DC maladjustment.
With the DC maladjustment inhibitor of low-pass filtering, be to adopt with the feedback form DC maladjustment of low-pass filtering ability to suppress circuit.This circuit comprises low pass filter and two parts of DC maladjustment subtracter.DC maladjustment subtracter comprises that the first difference input is to pipe M1 and M2, the source electrode parallel connection of M 1 and M2, the second difference input is to pipe M3 and M4, the source electrode parallel connection of M3 and M4, the drain electrode of M1 and M4 is in parallel, the drain electrode of M2 and M3 is in parallel, and the first difference input shares tail current pipe and biasing circuit to pipe and the input of the second difference to managing.The first offset M5 and the M6 of difference input to pipe M1 and M2, M5 and M6 are again the load pipe of each self-corresponding M1 and M2.The second difference input is to corresponding Vosp1 and the Vosn1 of being connected of the grid of pipe M3 and M4, one route cascade M14-M16 active pull-up and Embedded capacitor C 2 low pass filters and another route cascade M17-M19 active pull-up and Embedded capacitor C 3 low pass filters, 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 the DC maladjustment signal after the filtering of two-way active low-pass filter from limiting amplifier output feedback signal Vosp and Vosn.The first drain electrode of difference input to pipe M1 and M2, with the second difference input, the drain electrode of pipe M3 and M4 is intersected to corresponding being connected in parallel, differential input signal Vinn and Vinp input pipe M1 through the first difference, the DC maladjustment signal Vosp1 of the signal code after M2 amplifies and difference input and Vosn1 input pipe M3 through the second difference, signal code after M4 amplifies, at drain electrode sys node separately, complete 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 and eliminate function.
Fig. 5 provides the circuit diagram of the amplitude detection unit of the embodiment of the present invention, as shown in the figure: amplitude detection unit is by two asymmetric source coupled differential pair, and load current pipe and tail current biasing circuit form.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 pipe and the second source coupled differential to two of pipe transistorized breadth length ratios, and two pipe breadth length ratios are D
:1, form asymmetric source coupled differential pair; Two source coupled differential are to the grid of two of pipe P road input pipe M1 and M3 access in parallel P road input signal, two source coupled differential are to the grid of two of pipe N road input pipe M4 and M2 access in parallel N road input signal, two source coupled differential are to the source cross-coupled of the pipe corresponding load pipe that is connected in parallel, the source electrode access in parallel load pipe M7 of M1 and M2, the source electrode access in parallel load pipe M8 of M4 and M3.The transistor of amplitude detection unit is the three layer transistor structure that is applicable to low-voltage technique, and its output current Iout is directly proportional to input voltage, for detection of the amplitude size of input signal.The D value of embodiment is that breadth length ratio and the second source coupled differential of 4, the first source coupled differential to pipe M1 and M4 is 4 to the breadth length ratio of pipe M2 and M3
:1, M7, M8 is load current pipe, M9 is the transistor of the current subtraction of input voltage after the input pipe of two groups of different breadth length ratios amplifies, M10 is the mirrored transistor of M9, the amplitude that provides output current to characterize input voltage, is similar to because uneven difference input pipe can provide the electric current output that input range log-linear is relevant, utilizes this electric current by after tail current pipe mirror image, can provide an electric current relevant to input signal amplitude log-linear by it.
The 3rd embodiment
Fig. 6 provides the circuit diagram with another embodiment of DC maladjustment inhibitor of low-pass filtering, and its circuit forms except omitting the load pipe M8 and M9 of diode connection, basic identical with Fig. 6.
This circuit comprises low pass filter and two parts of DC maladjustment subtracter.Low pass filter extracts the DC component in the data after next stage limiting amplifier amplifies.Low pass filter consists 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 do very greatly, shared area is smaller again, corresponding capacitance can be obtained smaller, resistance and electric capacity can be realized on sheet like this, have saved chip cost.Input and subtracting each other of feedback signal input with the signal in the DC maladjustment inhibitor of low-pass filtering are that the opposite polarity circuit consisting of two pairs of breadth length ratios and the identical input pipe of operating state is realized, feedback signal is input to another output to input pipe of amplifying in a pair of input pipe that then output and input signal be input to after by the low pass circuit being comprised of active pull-up and passive capacitive and superposes, but is-symbol is contrary, the actual effect playing is wanted to subtract exactly, so just the DC maladjustment signal in feedback is added in signal with contrary symbol, played the object of filtering DC maladjustment.
The process prescription of detection input signal amplitude of below in conjunction with Fig. 3, Fig. 4 and Fig. 5, Fig. 2 b band DC maladjustment of the present invention being eliminated the amplitude detection circuit of function is as follows: it is 4 that M is set, and N is 5.
Differential input signal Vinn and Vinp are input to the differential input end of first order amplitude detection unit 209, detect, and output amplitude signal is converted into electric current without the input signal of limited range enlargement through amplitude detection unit 209, deliver to current adding circuit 214.Differential input signal Vinn and Vinp are input to the 1st grade of differential input end with the DC maladjustment inhibitor 201 of low-pass filtering simultaneously, the input signal of input signal after 201 low-pass filtering and DC maladjustment inhibition, sending thereafter the 1st grade of limiting amplifier 202 to make the 1st grade of limit puts, 1 grade of differential feedback input with the DC maladjustment inhibitor 201 of low-pass filtering of the differential output signal Vosn of the 1st grade of limiting amplifier 202 and Vosp feed back input to the, the differential input signal of differential feedback input signal and DC maladjustment inhibitor 201 is by the signal subtraction after low-pass filtering, this filtered signal is exactly the DC maladjustment signal in input signal, by subtracting each other elimination effect, offset the DC maladjustment composition in input circuit, thereby prevent that late-class circuit is saturated.The not signal with DC maladjustment of 201 outputs amplifies by the 1st grade of limiting amplifier 202, 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, by 210 asymmetric differential pairs, can detect the size of output input signal amplitude, and be translated into current signal, this conversion is by current mirror circuit, to obtain one to present the current signal of log-linear with the size of input signal amplitude, the 2nd grade of current signal that amplitude detection unit 210 is exported delivered to current adding circuit 214.The 2nd grade of DC maladjustment inhibitor 203 with low-pass filtering delivered in the output of the 1st grade of limiting amplifier 202, the 2nd grade of DC maladjustment inhibitor 203 with low-pass filtering, the 2nd grade of limiting amplifier 204 and the effect of 3rd level amplitude detection unit 211 and the effect of aforementioned circuit 201,202 and 210 are identical, eliminate the DC maladjustment of rear class, again small-signal is amplified, large-signal will be limited, and current signal is delivered to current adding circuit 214.By that analogy, repeat said process 4 times, finally make to need the small-signal detecting to be amplified fully until saturated, 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 the corresponding range signal detecting is converted into electric current and is input to current adding circuit 214, through current adding circuit 214, make to be added output signal after treatment, the low-pass filter circuit filtering that process R1 and C1 form again, the output voltage that obtains energy reflected input signal amplitude, completes input signal amplitude.The dynamic range of eliminating the amplitude detection circuit detection input signal of function with DC maladjustment depends on multiple limiting amplifiers 202,204,206, and the products of 208 gains.The different log-linears that are also sequentially similar to of 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 sequentially different, and each amplitude detection unit output current is sequentially log-linear variation with the changes in amplitude of input signal.Each amplitude detection unit output current of amplitude detection circuit and the relation of signal input range are log-linear relations, be that size after the size of output voltage and the amplitude of input signal are taken the logarithm is linear, output current sum and the input signal amplitude of realizing each amplitude detection unit are approximate log-linear relations.
The amplitude detection circuit of eliminating function with DC maladjustment, for radio-frequency transmitter, is applied to the demodulator circuit of zero intermediate frequency circuit, meets the requirement of system multi-frequency wide band radio-frequency chip.
Fig. 7 has provided a kind of amplitude detection module application of eliminating function with DC maladjustment of the embodiment of the present invention in radio-frequency transmitter, realizes output amplitude input, for the circuit of FEEDBACK CONTROL front end variable gain circuit, connects schematic block diagram.The amplitude detection circuit of amplitude detection module 77 for eliminating with DC maladjustment, radiofrequency signal input amplifier circuit in low noise 71, again by PGA variable gain radio frequency amplifier 73, via down-conversion mixer 75, close 76 mixing again, the radio-frequency component in low pass filter 78 and 79 filtering down-conversion mixer output signals is exported in mixing, through simulation automatic gain control circuit 710 and 711, be amplified to the required stable intermediate-freuqncy signal of base band demodulating 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, detection output voltage is offered to gain control module 72, gain control module 72 is by the voltage signal obtaining and reference voltage comparison, produce two groups of control signals and control respectively the gain of 71 low noise amplifiers 71 and variable gain radio frequency amplifier 73, thereby regulate the gain size of radio-frequency front-end system to prevent that the excessive saturated or too small signal to noise ratio of output that causes of gain of radio-frequency front-end is too low.In figure, 74 provide the orthogonal intrinsic signals of two-way to frequency mixer 76, 78, the topmost effect that wherein amplitude detection module plays is exactly the amplitude information that detects the signal of intermediate frequency, transfer information of voltage to and offer gain control module processing, owing to being the lower cut-off frequency of zero intermediate frequency system requirement, the amplitude detection module 77 with DC maladjustment elimination function of Embedded of the present invention just plays DC maladjustment and eliminates function, amplitude detection circuit is normally worked, meeting system low-voltage work, high dynamic range and low cost, under the prerequisite of high stable, complete amplitude detection function.
The amplitude detection circuit that a kind of utilization that Fig. 8 provides the embodiment of the present invention is eliminated with DC maladjustment is applied to the connection diagram of amplitude monitoring 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 to input range voltage, this signal is by filtering radio-frequency component wherein after 82 low pass filters, this signal again by a low-pass filter network being formed by resistance R 1 and C1 therewith signal directly compare, the i.e. output signal of amplitude supervisory circuit for this reason of the result comparing.Because the general frequency spectrum of amplitude pilot signal is all wider and be zero intermediate frequency signals, so the DC maladjustment in the present invention is eliminated circuit and can be guaranteed the normal work of amplitude detection module and can not increase extra pin, simultaneously because this system generally all can have lower power consumption for low-pressure designs to guarantee other modules, so the amplitude detection unit that is applied to low pressure in the present invention can guarantee that the function of amplitude detection module is normal.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 not deviating under the prerequisite of broad scope of the present invention, above-described embodiment is made to some changes.Thereby the present invention is not limited in disclosed specific embodiment.Its scope should contain appended claims limit core of the present invention and protection range in all changes.
Claims (9)
1. an amplitude detection circuit of eliminating function with DC maladjustment, is characterized in that the circuit of Embedded, multi-stage cascade, differential configuration is configured to:
A DC maladjustment that comprises the DC maladjustment inhibitor of M level with low-pass filtering suppresses circuit;
One comprises the amplitude limitation amplifying circuit of M level limiting amplifier;
One comprises the amplitude detection circuit of N level amplitude detection unit, and N is M+1; And
A current adding circuit; With
A low-pass filter circuit;
The amplitude detection circuit differential input end of input signal connecting band DC maladjustment elimination function is surveyed in difference censorship, and this differential input end comprises the differential input end of the differential input end of the first order amplitude detection unit being connected in parallel and the DC maladjustment inhibitor of first order band low-pass filtering; the difference output end of the corresponding DC maladjustment inhibitor that connects first order band low-pass filtering of differential input end of first order limiting amplifier, its differential output signal feeds back to the differential feedback input of the DC maladjustment inhibitor of first order band low-pass filtering, and the corresponding differential input end that connects next stage amplitude detection unit and next stage are with the differential input end of the DC maladjustment inhibitor of low-pass filtering, the difference output end of the corresponding DC maladjustment inhibitor that connects second level band low-pass filtering of differential input end of second level limiting amplifier, its differential output signal feeds back to the differential feedback input of the DC maladjustment inhibitor of second level band low-pass filtering, and the corresponding differential input end that connects next stage amplitude detection unit and next stage are with the differential input end of the DC maladjustment inhibitor of low-pass filtering, multi-stage cascade connects successively, until the corresponding difference output end that connects the DC maladjustment inhibitor of m level with low-pass filtering of the differential input end of m level limiting amplifier, its differential output signal feeds back to the differential feedback input of the DC maladjustment inhibitor of m level with low-pass filtering, and the corresponding differential input end that connects n level amplitude detection unit, n=m+1, the output of every grade of amplitude detection unit connects an input of current adding circuit, current adding circuit output connects low pass filter and amplitude detection output is provided, and surveys elimination and the amplitude detection of the DC maladjustment of input signal for realizing difference censorship in sheet.
2. the amplitude detection circuit of eliminating according to claim 1 function with DC maladjustment, is characterized in that: described amplitude limitation amplifying circuit comprises M level limiting amplifier, 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 the DC maladjustment inhibitor output of same one-level band low-pass filtering separately, the output of every grade of limiting amplifier is connected in series the input of the DC maladjustment inhibitor of next stage band low-pass filtering, the DC maladjustment causing for offsetting the DC maladjustment inhibitor of prime band low-pass filtering.
3. the amplitude detection circuit of eliminating according to claim 2 function with DC maladjustment, is characterized in that: described limiting amplifier is by inputting pipe, and load pipe and tail current pipe and bias current circuit form, and load pipe is the metal-oxide-semiconductor that collapsible diode connects; Limiting amplifier is fixed gain amplifier, and the breadth length ratio of the load metal-oxide-semiconductor that its yield value is connected with collapsible diode by the breadth length ratio of inputting metal-oxide-semiconductor is determined; For realizing large-signal and small-signal, can meet the testing requirement of amplitude detection unit.
4. with DC maladjustment, eliminate according to claim 1 the amplitude detection circuit of function, it is characterized in that: the described DC maladjustment inhibitor with low-pass filtering is that the reaction type DC maladjustment with low-pass filtering suppresses circuit, comprises the low pass filter and the DC maladjustment inhibitor that are connected in series; Wherein
Described low-pass filter circuit consists of active pull-up and passive capacitive, active pull-up is multi-stage cascade metal-oxide-semiconductor, each metal-oxide-semiconductor is operated in linear zone, for with compared with the large resistance resistance of small area implementation, the passive capacitive of small electric capacitance forms low pass filter, on sheet, realize, save chip area and cost;
The feedback input end of described DC maladjustment inhibitor connects limiting amplifier output, forms DC maladjustment and suppresses feedback loop; For low pass filter is extracted to the DC component of data after next stage limiting amplifier amplifies, subtract each other with the output signal of the limiting amplifier of prime, offset the DC maladjustment composition in limiting amplifier circuit.
5. the amplitude detection circuit of eliminating according to claim 4 function with DC maladjustment, is characterized in that: described DC maladjustment inhibitor is subtraction device, comprises that the first difference input is to pipe, and the second difference input is to pipe, and tail current pipe and biasing circuit; Each difference is inputted the source electrode parallel connection to pipe, and the first difference input intersects corresponding in parallel to two of pipe drain electrodes to two of pipe drain electrodes and the second difference input, and the first difference input shares tail current pipe and biasing circuit to pipe and the input of the second difference to managing; The first difference input of subtracter connects the low-pass filter circuit output of DC maladjustment inhibitor at the corresponding levels to the input of pipe, the second difference input connects with one-level limiting amplifier output the input of pipe; The first and second difference inputs are identical with operating state to the breadth length ratio of pipe, and the current polarity of the drain electrode alter-parallel node at the first and second input differences to pipe is contrary; Be used for realizing inhibition DC maladjustment.
6. with DC maladjustment, eliminate according to claim 1 the amplitude detection circuit of function, it is characterized in that: described amplitude detection circuit is comprised of N level amplitude detection unit, first order amplitude detection unit input connects censorship and surveys 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 output of each amplitude detection unit, be used to current adding circuit that the current amplitude of N detection signal is provided, the current amplitude of realizing N detection signal is added.
7. with DC maladjustment, eliminate the amplitude detection circuit of function according to claim 6, it is characterized in that: described amplitude detection unit by two asymmetric source coupled differential to pipe, two load current pipes, image current pipe and tail current biasing circuit form; Wherein
Described 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, form asymmetric source coupled differential pair; Two source coupled differential are to the grid of two of pipe P road input pipes access in parallel P road input signal, two source coupled differential are to the grid of two of pipe N road input pipes access in parallel N road input signal, 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 the three layer transistor structure that is applicable to low-voltage technique, and its output current Iout is directly proportional to input voltage, for detection of the amplitude size of input signal.
8. the amplitude detection circuit of eliminating according to claim 7 function with DC maladjustment, is characterized in that: described two asymmetric source coupled differential are to being adjustable asymmetric source coupled differential pair, and the first source coupled differential is D to two of pipe transistor breadth length ratios
:1, the second source coupled differential is also D to two of pipe transistor breadth length ratios
:the span of 1, D is 2～8, for regulate two transistor breadth length ratio D values in span by technique, obtains optimum results value, makes the error of amplitude quantizing little and low in energy consumption, reaches application system circuit requirement.
9. according to the amplitude detection circuit of eliminating function described in claim 1-8 with DC maladjustment, it is characterized in that: in described detected amplitude circuit, the differential pair tube of each amplitude detection unit is breadth length ratio dissymmetrical structure, differential pair tube is that breadth length ratio is because of ratio difference, output current is different and different with the breadth length ratio example of differential pair tube, the different also sequentially variations of breadth length ratio example of the differential pair tube of each amplitude detection unit, the log-linear that is sequentially similar to of the breadth length ratio example of differential pair tube changes; The size of each amplitude detection unit output current also can be sequentially different, and each amplitude detection unit output current is sequentially log-linear variation with the changes in amplitude of input signal.
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