CN108306620A - Charge guiding amplifying circuit and its control method - Google Patents
Charge guiding amplifying circuit and its control method Download PDFInfo
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- CN108306620A CN108306620A CN201710021056.9A CN201710021056A CN108306620A CN 108306620 A CN108306620 A CN 108306620A CN 201710021056 A CN201710021056 A CN 201710021056A CN 108306620 A CN108306620 A CN 108306620A
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- charge guiding
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- differential
- input signals
- amplifying circuit
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0216—Continuous control
- H03F1/0233—Continuous control by using a signal derived from the output signal, e.g. bootstrapping the voltage supply
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45031—Indexing scheme relating to differential amplifiers the differential amplifier amplifying transistors are compositions of multiple transistors
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45148—At least one reactive element being added at the input of a dif amp
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Amplifiers (AREA)
Abstract
A kind of charge guiding amplifying circuit of disclosure offer and its control method.Charge guiding amplifying circuit includes a charge guiding differential amplifier and a sample-and-hold circuit, and in a reset phase and an amplification stage to amplify a differential input signals, this method includes the charge guiding amplifying circuit blocked operation：In the reset phase, a common-mode voltage of the differential input signals is obtained according to the differential input signals；In the reset phase, which is provided to one of the charge guiding differential amplifier and the sample-and-hold circuit；In the reset phase, the differential input signals are sampled to generate a voltage signal using the sample-and-hold circuit；And in the amplification stage, which is input to the charge guiding differential amplifier.
Description
Technical field
This disclosure relates to charge guiding (charging-steering) amplifier, more particularly to put with charge guiding
The amplifying circuit of big device implementation.
Background technology
Fig. 1 is the circuit diagram of existing charge guiding differential amplifier.Charge guiding differential amplifier 100 is also known as dynamic
State amplifier (dynamic amplifier), is mainly made of transistor 110 and 120, additionally comprises switch 130~160 and capacitance
170~190.The connection type of each element is as shown in the figure.100 blocked operation of charge guiding differential amplifier is in reset phase
(Φs) and amplification stage (Φh) to amplify differential input signals Vi, and generate output signal Vo.Switch 130,140 and 150 is in weight
The stage of setting is not turned on and is connected in amplification stage, and switch 160 is connected in reset phase and is not turned in amplification stage.Charge guides
The details of operation of formula differential amplifier 100 is to be repeated no more known to those skilled in the art of the present technique.It is noted that charge
Grid-source voltage (the V of the gain (gain) and transistor 110 and 120 of guiding differential amplifier 100gs) closely related, because
As long as this differential input signals ViCommon-mode voltage some micro-disturbances (perturbation), will be to output signal VoGenerate phase
When the influence of degree, the efficiency of charge guiding differential amplifier is caused to reduce.
Invention content
In view of the deficiencies in the prior art, the one of the disclosure is designed to provide a kind of charge guiding amplifying circuit and its control
Method processed, to promote the efficiency and stability of charge guiding amplifying circuit.
The disclosure discloses a kind of charge guiding amplifying circuit, and blocked operation is in a reset phase and an amplification stage to put
A big differential input signals, including：One sample-and-hold circuit, including a capacitance and sample the differential input signals with generate one electricity
Press signal；One charge guiding differential amplifier, including：One first end of one transistor, the transistor receives the voltage signal,
An output end of one second end of the transistor as the charge guiding differential amplifier；One switch, not in the reset phase
It is connected and is connected in the amplification stage；And a capacitance, a third end of the transistor is coupled by the switch；And one reference
Voltage generation circuit couples the charge guiding differential amplifier, according to the differential input signals one reference voltage of generation, and in
The reset phase is by the reference voltage output to the capacitance；Wherein, the common mode electricity of the reference voltage and the differential input signals
Pressure is related.
The disclosure separately discloses a kind of charge guiding amplifying circuit, blocked operation in a reset phase and an amplification stage with
Amplify a differential input signals, including：One charge guiding differential amplifier receives a voltage signal by an input terminal；One
Sample-and-hold circuit couples the charge guiding differential amplifier and samples the differential input signals to generate the voltage signal,
Including：One capacitance has a first end and a second end；And multiple switch, it is led according to the reset phase and the amplification stage
Lead to or is not turned on；And a generating circuit from reference voltage, the sample-and-hold circuit is coupled, one is generated according to the differential input signals
First reference voltage, first reference voltage are related to a common-mode voltage of the differential input signals；Wherein, in the resetting rank
Section, the first end of the capacitance receives the differential input signals and the second end of the capacitance couples first reference voltage, with
And in the amplification stage, the first end of the capacitance couples the input terminal and one second reference of second end coupling of the capacitance
Voltage.
The disclosure separately discloses a kind of control method of charge guiding amplifying circuit, which includes
One charge guiding differential amplifier and a sample-and-hold circuit, the charge guiding amplifying circuit blocked operation reset rank in one
To amplify a differential input signals, this method includes for section and an amplification stage：In the reset phase, according to the differential input signals
Obtain a common-mode voltage of the differential input signals；In the reset phase, it is poor which is provided to the charge guiding
Dynamic one of amplifier and the sample-and-hold circuit；In the reset phase, it is differential to sample this using the sample-and-hold circuit
Input signal is to generate a voltage signal；And in the amplification stage, it is differential which is input to the charge guiding
Amplifier.
The charge guiding amplifying circuit and its control method of the disclosure can effectively eliminate common mode perturbations, to promote electricity
The efficiency and stability of lotus guiding amplifying circuit.Compared to traditional technology, the charge guiding amplifying circuit of the disclosure and its
The mode that control method adopts feedforward eliminates common mode perturbations, it is possible to prevente effectively from common mode perturbations enter charge guiding amplifying circuit
Charge guiding differential amplifier.
Feature, implementation in relation to the disclosure and technique effect, hereby attached drawing being coordinated to make embodiment, detailed description are as follows.
Description of the drawings
Fig. 1 is the circuit diagram of existing charge guiding differential amplifier；
Fig. 2A is the circuit of an embodiment of charge guiding (charging-steering) amplifying circuit of the disclosure
Figure；
Fig. 2 B are the circuit diagram of an embodiment of the charge guiding differential amplifier of the disclosure；
Fig. 3 is the circuit diagram of an embodiment of disclosure generating circuit from reference voltage；
Fig. 4 is the circuit diagram of a mode of operation of disclosure generating circuit from reference voltage；
Fig. 5 is the circuit diagram of another mode of operation of disclosure generating circuit from reference voltage；
Fig. 6 A are the circuit diagram of another embodiment of the charge guiding amplifying circuit of the disclosure；
Fig. 6 B are the circuit diagram of another embodiment of the charge guiding differential amplifier of the disclosure；
Fig. 7 is the flow chart of a wherein embodiment for the control method of the charge guiding amplifying circuit of the disclosure；And
Fig. 8 is the flow chart of another embodiment of the control method of the charge guiding amplifying circuit of the disclosure.
Reference sign：
100, the charge of 100a, 100b, 210,310 guiding differential amplifier
110,120 transistor
130、140、150、160、130a、140a、150a、160a、130b、140b、150b、160b、222、224、226、
228,233,234,235,236,237,238,321,322,323,324,325,326,327,328 switch
170、180、190、170a、180a、190a、170b、180b、190b、221、225、231、232、329a、329b
Capacitance
200,300 charge guiding amplifying circuit
220,320 sample-and-hold circuit
230 generating circuit from reference voltage
239 buffer cells
S710~S750, S810~S840 steps
Specific implementation mode
The technical terms of following description are the idioms with reference to the art, if this specification is to part term
Be illustrated or define, the explanation of the part term be subject to this specification explanation or definition.
The disclosure of the disclosure includes charge guiding amplifying circuit and its control method.Since the charge of the disclosure draws
It may be well known elements for subelement that conduction amplifying circuit is included is independent, therefore not influence the device embodiment
Under the premise of fully open and exploitativeness, illustrate that the details of well known elements will be omitted below.In addition, the disclosure
Some or all of the control method of charge guiding amplifying circuit flow can be the shape of software and/or firmware cooperation hardware
Formula, and can be executed by the charge guiding amplifying circuit or its equivalent device of the disclosure, implement not influencing this method
Example it is abundant openly and under the premise of exploitativeness, the explanation of following methods embodiment will focus on step content and non-hardware.
Fig. 2A is the circuit of an embodiment of charge guiding (charging-steering) amplifying circuit of the disclosure
Figure.Charge guiding amplifying circuit 200 includes charge guiding differential amplifier 210, sample-and-hold circuit 220 and reference electricity
Press generation circuit 230.Charge guiding differential amplifier 210 can be real by the charge guiding differential amplifier 100a of Fig. 2 B
Make.Charge guiding differential amplifier 100a is mainly made of transistor 110a and 120a, additionally comprise switch 130a~160a and
Capacitance 170a~190a.As shown in Figure 2 B, one end of switch 160a couples generating circuit from reference voltage 230.Specifically, it is resetting
At the end of stage, the cross-pressure of the capacitance 190a in Fig. 2 B is reference voltage Vref.
Sample-and-hold circuit 220 is used for sampling differential input signals Vi(by voltageAnd voltageConstitute), including capacitance
221,225, and switch 222,224,226,228.In reset phase, switch 222 and 228 is connected, and switch 224 and 226
It is not turned on.At the end of reset phase, the cross-pressure of capacitance 221 and 225 is respectively equal to voltageAnd voltageIn amplification stage,
Switch 222 and 228 is not turned on, and switch 224 and 226 is connected, and makes voltageAnd voltageCan respectively by node N1 and
N2 input charge guidings differential amplifier 210.
Fig. 3 is the circuit diagram of an embodiment of generating circuit from reference voltage 230.Generating circuit from reference voltage 230 includes electricity
Appearance 231 and 232, switch 233~238 and buffer cell 239 (with operational amplifier implementation in this example, but not limited to this).
In amplification stage, switch 233,234 and 238 is not turned on, and switch 235,236 and 237 is connected, and forms electricity as shown in Figure 4
Road, buffer cell 239 is idle state at this time.At the end of amplification stage, the cross-pressure of capacitance 231 and 232 is respectively voltage Vb1With electricity
Press Vb2Difference.In reset phase, switch 233,234 and 238 is connected, and switch 235,236 and 237 is not turned on, and is formed such as
Circuit shown in fig. 5.It is at this time differential input signals V in the voltage of node N3iCommon-mode voltage VcmIn addition voltage Vb1With electricity
Press Vb2Difference.In other words, the reference voltage Vref (=V that generating circuit from reference voltage 230 is exported in reset phasecm+
Vb2-Vb1) it is common-mode voltage (Vcm) add a DC voltage (Vb2-Vb1), that is, reference voltage Vref and differential input signals Vi
Common-mode voltage it is related.
Referring again to Fig. 2 B, above-mentioned reference voltage Vref makes capacitance 190a have cross-pressure after reset phase
Vref.In next amplification stage, the grid-source voltage of transistor 110aAlso that is, Vgs=(vd
+Vcm)-(Vcm+Vb2-Vb1)=vd- (Vb2-Vb1), wherein vdFor the differential voltage of differential input signals.Transistor 120a similarly,
It repeats no more.It can be found that the grid-source voltage V of transistor 110a and 120a at this timegsIt is no longer disturbed by common-mode voltage
It influences.In some embodiments, |-(Vb2-Vb1) | it preferably may be designed as the critical electricity more than or equal to transistor 110a and 120a
Press (threshold voltage) VthAbsolute value, to ensure that transistor 110a and 120a is opened.Herein transistor 110a and
Though 120a, also can be with N-type implementation by taking p-type metal-oxide half field effect transistor (MOSFET) as an example, this is the art technology people
Known to member, repeat no more.
In being simulated at one, common-mode voltage VcmIt is equal to 125MHz for frequency and amplitude is equal to the string wave signal of 100mV.Simulation
The results show that do not use above-mentioned mechanism charge guiding amplifying circuit for, signal noise be distorted than (signal-
To-noise-plus-distortion ratio, SNDR) 25.2dB (common modes are down to by 48.3dB (common-mode voltage is undisturbed)
Voltage is disturbed)；Opposite, for the charge guiding amplifying circuit of the disclosure, SNDR is only down to by 48.3dB
34.2dB.It can be seen that eliminated by above-mentioned common mode perturbations (common mode perturbation cancelling,
CMPC) performance of charge guiding amplifying circuit can be substantially improved in mechanism.
Fig. 6 A are the circuit diagram of another embodiment of the charge guiding amplifying circuit of the disclosure.Charge guiding amplification electricity
Road 300 includes charge guiding differential amplifier 310, sample-and-hold circuit 320 and generating circuit from reference voltage 230.Charge
Guiding differential amplifier 310 can be by the charge guiding differential amplifier 100b implementations of Fig. 6 B.Charge guiding is differential to be put
Big device 100b is mainly made of transistor 110b and 120b, additionally comprises switch 130b~160b and capacitance 170b~190b.Sampling
Holding circuit 320 is used for sampling differential input signals Vi, including capacitance 329a, 329b, and switch 321~328.In resetting rank
Section, switch 321,324,325 and 328 is connected, and switch 322,323,326 and 327 is not turned on so that capacitance 329a and 329b
Both ends receive differential input signals V respectivelyiAnd reference voltage Vref.At the end of reset phase, the cross-pressure on capacitance 329a
ForCapacitance 329b
Similarly, it repeats no more.
In next amplification stage, switch 321,324,325 and 328 is not turned on, and switch 322,323,326 and
327 conductings so that one end coupling voltage V of capacitance 329a and 329bb3, the other end couple nodes N1 or N2.Charge guides at this time
The obtained input voltage of input terminal of formula differential amplifier 310 is Δ V+Vb3=vd-(Vb2-Vb1)+Vb3.It can be found that at this time
The input voltage of charge guiding differential amplifier 310 is not influenced by common-mode voltage disturbance.In some embodiments, |-(Vb2-
Vb1)+Vb3| it preferably may be designed as the critical voltage V more than or equal to transistor 110b and 120bthAbsolute value, to ensure crystal
Pipe 110b and 120b are opened.Such as V can be designedb1=Vb2, thus can be by adjusting voltage V merelyb3To adjust crystal
The bias of pipe 110b and 120b, also i.e. by voltage | Vb3| it is designed as the critical voltage V more than or equal to transistor 110b and 120bth
Absolute value.
The performance of charge guiding amplifying circuit can be also substantially improved by eliminating mechanism by above-mentioned common mode perturbations.
In conclusion it is to take out the common-mode voltage of differential input signals, and pass through that the common mode perturbations of the disclosure, which eliminate mechanism,
The charge guiding that common-mode voltage is sent to charge guiding differential amplifier circuit by the mode of feedforward (feed forward) is poor
Dynamic amplifier or sample-and-hold circuit, to eliminate common mode perturbations.Mode (such as the common-mode feedback of existing feedback (feedback)
(Common Mode Feedback, CMFB)) it is to be parsed suffered by common-mode voltage from the output of charge guiding differential amplifier
Disturbance, then according to disturbance degree feedback adjustment transistor bias state.In detail, feedback means are to utilize this this bout
The output signal of (one time include reset phase and an adjacent amplification stage) mitigates the common-mode voltage of second leg
Disturbance, however because the common mode input disturbed can impact the gain of this bout of amplifying circuit anyway,
So the effect of feedback method is not evident.In comparison, the disclosure using feedforward means be using the input signal of this bout come
The common-mode voltage disturbance of this bout is eliminated, therefore the signal handled by charge guiding differential amplifier can ideally exclude completely
Common-mode voltage disturbs, and the stability of the gain of charge guiding differential amplifier is made to get a promotion.
The embodiment of disclosure Fig. 6 A is equally applicable for the transistor 110b and 120b of (1) Fig. 6 B by the electricity of current source bias
Lotus guiding differential amplifier；And the transistor 110b and 120b of (2) Fig. 6 B directly couples a reference potential (such as transistor
The source electrode of 110b and 120b is directly grounded) charge guiding differential amplifier.Above-described embodiment (1) and the details of operation of (2)
Known to those skilled in the art of the present technique, repeat no more.
In addition to charge guiding amplifying circuit above-mentioned, the disclosure also correspondingly discloses a kind of charge guiding and puts
The control method of big circuit.Fig. 7 is the flow chart of this method wherein embodiment, can be by preceding taking off charge guiding amplifying circuit
200 or its equivalent device execute, comprise the steps of：
Step S710：In reset phase, a common-mode voltage of the differential input signals is obtained according to the differential input signals.
Such as common-mode voltage is obtained by the generating circuit from reference voltage 230 of Fig. 3；
Step S720：In reset phase, which is provided to charge guiding differential amplifier.In detail, should
Charge guiding differential amplifier includes transistor and capacitance, which is provided to the capacitance and couples the transistor
One end of source electrode；
Step S730：In reset phase, while the capacitance that a direct current is depressed into charge guiding differential amplifier is provided,
Make the same end of the capacitance while receiving the common-mode voltage and the DC voltage；
Step S740：In reset phase, the differential input signals are sampled to generate a voltage using the sample-and-hold circuit
Signal；And
Step S750：In amplification stage, which is input to the charge guiding differential amplifier.
Those skilled in the art of the present technique can learn Fig. 7 from the description previously with regard to charge guiding amplifying circuit 200
Flow details of operation and other corresponding rate-determining steps, therefore no longer the gift presented to a senior at one's first visit as a mark of esteem is stated.
Fig. 8 is the flow chart of this method wherein embodiment, can be by preceding taking off charge guiding amplifying circuit 300 or its is equivalent
Device executes, and comprises the steps of：
Step S810：In reset phase, a common-mode voltage of the differential input signals is obtained according to the differential input signals.
Such as common-mode voltage is obtained by the generating circuit from reference voltage 230 of Fig. 3；
Step S820：In reset phase, which is provided to sample-and-hold circuit；
Step S830：In reset phase, the differential input signals are sampled to generate a voltage using the sample-and-hold circuit
Signal；And
Step S840：In amplification stage, which is input to the charge guiding differential amplifier.
Those skilled in the art of the present technique can learn Fig. 8 from the description previously with regard to charge guiding amplifying circuit 300
Flow details of operation and other corresponding rate-determining steps, therefore no longer the gift presented to a senior at one's first visit as a mark of esteem is stated.
Since those skilled in the art of the present technique can understand the disclosure by the disclosure of the device embodiment of the disclosure
Embodiment of the method implementation detail and variation, therefore, to avoid superfluous text, in the open request for not influencing this method embodiment and
Under the premise of exploitativeness, repeat description is omitted herein.It is taken off in diagram before note that, the shape of element, size, ratio
Sequence etc. of example and step is only to illustrate, and is to understand the disclosure for those skilled in the art of the present technique, non-limiting this
It is open.
Although embodiment of the disclosure is as described above, however the multiple embodiment is not to be used for limiting the disclosure, this skill
Art field technology personnel can impose variation according to the content of the disclosure expressed or implied to the technical characteristic of the disclosure, all such
Kind variation may belong to the patent protection scope sought by the disclosure, and in other words, the scope of patent protection of the disclosure must regard this
Subject to the as defined in claim of specification.
Claims (10)
1. a kind of charge guiding amplifying circuit, blocked operation is in a reset phase and an amplification stage to amplify a differential input
Signal, including：
One sample-and-hold circuit a, including capacitance and sampling the differential input signals to generate a voltage signal；
One charge guiding differential amplifier, including：
One first end of one transistor, the transistor receives the voltage signal, and a second end of the transistor is drawn as the charge
One output end of conduction differential amplifier；
One switch is not turned in the reset phase and is connected in the amplification stage；And
One capacitance couples a third end of the transistor by the switch；And
One generating circuit from reference voltage couples the charge guiding differential amplifier, and a ginseng is generated according to the differential input signals
Examine voltage, and in the reset phase by the reference voltage output to the capacitance；
Wherein, the reference voltage is related to a common-mode voltage of the differential input signals.
2. charge guiding amplifying circuit as described in claim 1, the wherein reference voltage are the common-mode voltages plus always
Galvanic electricity pressure.
3. charge guiding amplifying circuit as claimed in claim 2, the wherein absolute value of the DC voltage are more than the transistor
A critical voltage absolute value.
4. a kind of charge guiding amplifying circuit, blocked operation is in a reset phase and an amplification stage to amplify a differential input
Signal, including：
One charge guiding differential amplifier receives a voltage signal by an input terminal；
One sample-and-hold circuit couples the charge guiding differential amplifier and samples the differential input signals to generate the voltage
Signal, including：
One capacitance has a first end and a second end；And
Multiple switch is connected or is not turned on according to the reset phase and the amplification stage；And
One generating circuit from reference voltage couples the sample-and-hold circuit, and one first is generated with reference to electricity according to the differential input signals
Pressure, first reference voltage are related to a common-mode voltage of the differential input signals；
Wherein, in the reset phase, the first end of the capacitance receives the differential input signals and the second end coupling of the capacitance
Connect first reference voltage, and, in the amplification stage, the first end of the capacitance couple the input terminal and the capacitance this
Two ends couple one second reference voltage.
5. charge guiding amplifying circuit as claimed in claim 4, wherein first reference voltage are equal to the differential input letter
Number the common-mode voltage.
6. charge guiding amplifying circuit as claimed in claim 5, wherein the charge guiding differential amplifier include one brilliant
Body pipe, a first end of the transistor is as the input terminal, and charge guiding is differential puts as this for a second end of the transistor
One output end of big device, and the absolute value of second reference voltage is more than the absolute value of a critical voltage of the transistor.
7. charge guiding amplifying circuit as claimed in claim 4, wherein first reference voltage are equal to the differential input letter
Number the common-mode voltage add a DC voltage.
8. charge guiding amplifying circuit as claimed in claim 7, wherein the charge guiding differential amplifier include one brilliant
Body pipe, a first end of the transistor is as the input terminal, and charge guiding is differential puts as this for a second end of the transistor
One output end of big device, and the absolute value of second reference voltage and the summation of the DC voltage is one critical more than the transistor
The absolute value of voltage.
9. a kind of control method of charge guiding amplifying circuit, which includes that a charge guiding is poor
Dynamic amplifier and a sample-and-hold circuit, the charge guiding amplifying circuit blocked operation is in a reset phase and an amplification stage
To amplify a differential input signals, this method includes：
In the reset phase, a common-mode voltage of the differential input signals is obtained according to the differential input signals；
In the reset phase, which is provided to its of the charge guiding differential amplifier and the sample-and-hold circuit
One of；
In the reset phase, the differential input signals are sampled to generate a voltage signal using the sample-and-hold circuit；And
In the amplification stage, which is input to the charge guiding differential amplifier.
10. control method as claimed in claim 9, wherein the charge guiding differential amplifier include a capacitance, when this is total
When the reset phase is provided to the charge guiding differential amplifier, this method also includes mode voltage：
One direct current is provided simultaneously and is depressed into the endpoint that the capacitance receives the common-mode voltage.
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