CN109245770A - Signal sample circuit - Google Patents
Signal sample circuit Download PDFInfo
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- CN109245770A CN109245770A CN201811366163.6A CN201811366163A CN109245770A CN 109245770 A CN109245770 A CN 109245770A CN 201811366163 A CN201811366163 A CN 201811366163A CN 109245770 A CN109245770 A CN 109245770A
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- 239000003990 capacitor Substances 0.000 claims abstract description 71
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 230000003321 amplification Effects 0.000 claims description 7
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 7
- 238000001914 filtration Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000013139 quantization Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03M—CODING; DECODING; CODE CONVERSION IN GENERAL
- H03M1/00—Analogue/digital conversion; Digital/analogue conversion
- H03M1/12—Analogue/digital converters
- H03M1/124—Sampling or signal conditioning arrangements specially adapted for A/D converters
- H03M1/1245—Details of sampling arrangements or methods
- H03M1/1265—Non-uniform sampling
- H03M1/127—Non-uniform sampling at intervals varying with the rate of change of the input signal
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/68—Combinations of amplifiers, e.g. multi-channel amplifiers for stereophonics
Abstract
Present invention discloses a kind of signal sample circuits, including gain amplifying circuit, filter circuit, sampling hold circuit and A/D conversion circuit, sampling hold circuit therein includes voltage comparator, switching transistor, storage capacitor and operational amplifier, voltage comparator is for comparator input signal and feedback signal and control switch triode on-off, when switching transistor conducting, storage capacitor charging, operational amplifier is in sample states simultaneously, when switching transistor blocks, storage capacitor electric discharge, operational amplifier are in hold mode.Voltage compares signal sample circuit of the invention and closed-loop feedback mode realizes that sampling keeps function due to using, pass through the sampling and holding of switching transistor real-time control operational amplifier, with the sampling of variation real-time transform and holding of input signal, precision is high, and stability is good.
Description
Technical field
The embodiment of the present invention is related to a kind of signal sample circuit, in particular to be that a kind of analog signal samples
Circuit.
Background technique
Compared with simulation system, digital display circuit has higher precision and better stability, so in signal processing,
Many times it is difficult to handle with analogy method, but digitally processing is just very easy to, and is then just needed analog signal
It is sampled, carries out Digital Signal Processing again after becoming digital signal.Signal sampling process is exactly by signal from continuous-time domain
On analog signal be transformed into the process of the discrete signal on Disgrete Time Domain, usually sampling combines progress with quantization, simulation
Signal is first sampled according to certain time interval by sampler and obtains time upper discrete signal, then is existed through analog-digital converter (ADC)
Discretization is numerically also carried out, to obtain numerical value and digital signal all discrete on the time.
Presently, there are many signal sample circuits, " A/D conversion " therein is the necessary steps of signal sampling process, still
A/D converter completes primary conversion and needs certain time, so needing the analog signal of A/D converter input terminal in the transition period
Voltage remains unchanged the accuracy that just can guarantee conversion, finally realizes high sampling precision.So keep starting with from sampling is improved,
A high-precision signal sampling circuit is designed, there is good feasibility.
Summary of the invention
The purpose of the present invention is to provide a kind of with the variation real-time transform sampling of input signal, the high-precision of retention time
Signal sample circuit.
For achieving the above object, present invention employs following technical solutions: a kind of signal sample circuit, including gain
Amplifying circuit, filter circuit, sampling hold circuit and A/D conversion circuit, wherein gain amplifying circuit input terminal input input letter
Number, output end is connect with filter circuit, for carrying out gain amplification to input signal；Filter circuit is connected to gain amplifying circuit
Output end, for filtering out the ripple of the amplified input signal of gain；Sampling hold circuit is connected to filter circuit output end,
Including voltage comparator, switching transistor, storage capacitor and operational amplifier, the in-phase end of voltage comparator connects filter circuit
Output end, backward end connection operational amplifier backward end, output end connection switch transistor base, switching transistor current collection
Pole connect filter circuit output end, emitter connection operational amplifier in-phase end, the in-phase end of operational amplifier also with energy storage
Capacitance connection, backward end and output end connect；A/D conversion circuit is connect with operational amplifier output terminal, for input signal
Carry out analog-to-digital conversion.
In addition, the present invention also provides following attached technical schemes:
Gain amplifying circuit includes sequentially connected first voltage follower, signal amplifier and second voltage follower,
The in-phase end of first voltage follower be input signal input terminal, backward end connect with its output end, its output end also with letter
The connection of number amplifier in, signal amplifier output end are connect with second voltage follower in-phase end, second voltage follower
Backward end is connect with its output end, and output end is also connect with filter circuit.
Gain amplifying circuit further include capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7 and
Capacitor C8；Wherein, capacitor C1 and C2 is parallel with one another and is connected between the in-phase end and ground of first voltage follower；Capacitor C3 and
C4 is parallel with one another and is connected to the positive supply input terminal of the first signal amplifier；Capacitor C5 and C6 is parallel with one another and is connected to first
The negative supply input terminal of signal amplifier；Capacitor C7 and C8 is parallel with one another and connects and the output end and ground of second voltage follower
Between.
Filter circuit includes resistance R1, capacitor C9 and capacitor C10, and wherein one end of resistance R1 connects the gain amplification electricity
The in-phase end of the output end on road, other end connection voltage comparator, the one end capacitor C9 connect the in-phase end, another of voltage comparator
End ground connection, capacitor C10 are in parallel with capacitor C9.
Sampling hold circuit 3 further includes potentiometer RP1, resistance R2 and resistance R3, and the adjustable end of potentiometer RP1 connects voltage
The backward end of comparator, one of fixing end are followed by output end, another fixing end of operational amplifier by resistance R2
By being grounded after resistance R3.
Compared with the prior art, the advantage of signal sample circuit of the invention is: it includes gain amplifying circuit, filtering
Circuit, sampling hold circuit and A/D conversion circuit, sampling hold circuit therein include voltage comparator, switching transistor, storage
Energy capacitor and operational amplifier, voltage comparator are used for comparator input signal and feedback signal and control switch triode on-off,
When switching transistor conducting, storage capacitor charging, while operational amplifier is in sample states, when switching transistor blocks
When, storage capacitor electric discharge, operational amplifier is in hold mode.Signal sample circuit of the invention due to use voltage to compare with
And closed-loop feedback mode realizes that sampling keeps function, by the sampling and holding of switching transistor real-time control operational amplifier,
With the sampling of variation real-time transform and holding of input signal, precision is high, and stability is good.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of Related Art
Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description merely relates to of the invention some
Embodiment, not limitation of the present invention.
Fig. 1 is the circuit diagram of the signal sample circuit of present pre-ferred embodiments.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
It applies mode and further unrestricted detailed description is made to technical solution of the present invention.
See Fig. 1, the signal sample circuit of the present embodiment include gain amplifying circuit, filter circuit, sampling hold circuit and
A/D conversion circuit.
For carrying out to the input signal of input, isolation follows gain amplifying circuit and gain is amplified comprising the first electricity
Press follower U1, signal amplifier U2, second voltage follower U3, capacitor C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5,
Capacitor C6, capacitor C7 and capacitor C8.The in-phase end of first voltage follower U1 is the input terminal of input signal, input input letter
Number, backward end is connect with output end, constitutes negative-feedback, while output end is also connect with signal amplifier U1 input terminal.Capacitor C1
It is parallel with one another with capacitor C2, and be connected between the in-phase end and ground of first voltage follower U1, which is used for defeated
Enter signal to be filtered for the first time, plays stabilization.The signal input part (VINP) of signal amplifier U2 is followed with first voltage
The connection of device U1 output end, receives and is isolated by first voltage follower U1 with subsequent input signal, and carries out to input signal
Gain amplification.It is connected with capacitor C3 and capacitor C4 in the positive supply input terminal (+5v) of signal amplifier U2, capacitor C3 and C4 is mutual
Parallel connection prevents it from influencing input signal amplification for filtering positive input power supply clutter；Likewise, in the negative of signal amplifier U2
Power input (- 5v) is connected with capacitor C5 and capacitor C6, and capacitor C5 and C6 is parallel with one another, miscellaneous for filtering negative input power supply
Wave prevents it from influencing input signal amplification.The in-phase end of second voltage follower U2 is the input terminal of input signal after amplification,
The signal output end (Vout) of connection signal amplifier U2；Backward end connects output end, and output end connects filter circuit.Capacitor C7
And C8 is parallel with one another and connects between the output end and ground of second voltage follower U2, for stablizing second voltage follower U2
Output signal.
Filter circuit includes resistance R1, capacitor C9 and capacitor C10, and wherein one end of resistance R1 connects second voltage follower
Output end, the other end of U2 connect the in-phase end of the voltage comparator of sampling hold circuit 3, and the connection sampling of the one end capacitor C9 is kept
The in-phase end of the voltage comparator of circuit 3, other end ground connection, capacitor C10 are in parallel with capacitor C9.Resistance R1, capacitor C9 and capacitor
C10 constitutes RC filter network, eliminates the abnormal spike burr of 3 input terminal of sampling hold circuit, is that input signal is more stable.
Sampling hold circuit include voltage comparator U4, switching transistor Q1, storage capacitor C11 and operational amplifier U5,
Potentiometer RP1, resistance R2 and resistance R3.The in-phase end of voltage comparator U4 connects resistance R1, and input is after the filtering of filter circuit 2
Input signal；The backward end of voltage comparator U4 connects the adjustable end potentiometer RP1, one of fixing end of potentiometer RP1
The output end to operational amplifier U5, another fixing end are followed by by being grounded after resistance R3 by resistance R2；Voltage comparator
The base stage of the output end connection switch triode Q1 of U4.The collector of switching transistor Q1 connects resistance R1, inputs through filtered electrical
The filtered input signal in road 2, emitter connect the in-phase end of operational amplifier U5.The in-phase end of operational amplifier U5 also with storage
Energy capacitor C11 connection, backward end are connect with output end, constitute negative-feedback.
When applied signal voltage rises, voltage comparator U4 in-phase end voltage is greater than backward end feedback voltage, output end
High level, switching transistor Q1 conducting are exported, input signal input operational amplifier U5, U5 sample output signal, with
Input signal charges to storage capacitor C11 simultaneously for this, and sampling hold circuit is in sample states at this time.Under applied signal voltage
When drop, voltage comparator U4 in-phase end voltage is less than backward end feedback voltage, and output end exports low level, switching transistor Q1 resistance
Disconnected, storage capacitor C11 electric discharge, sampling hold circuit is in hold mode at this time.By Real-time Feedback, real-time control switch leads to
It is disconnected to realize precisely sampling.
And this sampling hold circuit also passes through adjusting potentiometer RP1, thus it is possible to vary the comparison current potential of voltage comparator U4,
The phase for changing voltage comparator U4 feedback loop reaches the quiescent point zero for making circuit, so that circuit is not likely to produce
Concussion, improves the stability of circuit.
Existing AD7810 chip circuit U6, the output of input terminal and operational amplifier U5 can be used in A/D conversion circuit
Analog sampling signal is converted to and is exported after digital signal from output end, completes signal sampling by end connection.
It is pointed out that the technical concepts and features of above-mentioned preferred embodiment only to illustrate the invention, its object is to
Those skilled in the art can understand the contents of the present invention and implements accordingly, and protection of the invention can not be limited with this
Range.Any equivalent change or modification in accordance with the spirit of the invention should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of signal sample circuit, it is characterised in that: including gain amplifying circuit, filter circuit, sampling hold circuit and A/D
Conversion circuit, wherein
The gain amplifying circuit input terminal inputs input signal, and output end is connect with filter circuit, be used for input signal into
Row gain amplification；
The filter circuit is connected to gain amplifying circuit output end, for filtering out the ripple of the amplified input signal of gain；
The sampling hold circuit is connected to filter circuit output end comprising voltage comparator, switching transistor, storage capacitor
And operational amplifier, output end, the backward end of the in-phase end connection filter circuit of voltage comparator connect the anti-of operational amplifier
Xiang Duan, output end connection switch transistor base, switching transistor collector connect filter circuit output end, emitter connection fortune
The in-phase end of amplifier is calculated, the in-phase end of operational amplifier is also connect with storage capacitor, backward end and output end connect；
The A/D conversion circuit is connect with operational amplifier output terminal, for carrying out analog-to-digital conversion to input signal.
2. signal sample circuit according to claim 1, it is characterised in that: the gain amplifying circuit includes being sequentially connected
First voltage follower, signal amplifier and second voltage follower, the in-phase end of first voltage follower is input signal
Input terminal, backward end is connect with its output end, its output end is also connect with the first signal amplifier input terminal, the first signal is put
Big device output end is connect with second voltage follower in-phase end, and second voltage follower backward end is connect with its output end, defeated
Outlet is also connect with filter circuit.
3. signal sample circuit according to claim 2, it is characterised in that: the gain amplifying circuit further includes capacitor
C1, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C6, capacitor C7 and capacitor C8；Wherein, capacitor C1 and C2 are parallel with one another
And it is connected between the in-phase end and ground of first voltage follower；Capacitor C3 and C4 is parallel with one another and is connected to signal amplifier
Positive supply input terminal；Capacitor C5 and C6 is parallel with one another and is connected to the negative supply input terminal of signal amplifier；Capacitor C7 and C8 phase
Mutually between parallel connection and connection and the output end and ground of second voltage follower.
4. signal sample circuit according to claim 1, it is characterised in that: the filter circuit includes resistance R1, capacitor
Wherein one end of C9 and capacitor C10, resistance R1 connect the output end of the gain amplifying circuit, other end connection voltage comparator
In-phase end, the one end capacitor C9 connects the in-phase end of voltage comparator, other end ground connection, and capacitor C10 is in parallel with capacitor C9.
5. signal sample circuit according to claim 1, it is characterised in that: the sampling hold circuit further includes potentiometer
RP1, resistance R2 and resistance R3, the backward end of the adjustable end connection voltage comparator of potentiometer RP1, one of fixing end pass through
Resistance R2 is followed by the output end to operational amplifier, another fixing end by being grounded after resistance R3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811366163.6A CN109245770B (en) | 2018-11-16 | 2018-11-16 | Signal sampling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811366163.6A CN109245770B (en) | 2018-11-16 | 2018-11-16 | Signal sampling circuit |
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| Publication Number | Publication Date |
|---|---|
| CN109245770A true CN109245770A (en) | 2019-01-18 |
| CN109245770B CN109245770B (en) | 2023-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811366163.6A Active CN109245770B (en) | 2018-11-16 | 2018-11-16 | Signal sampling circuit |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111313899A (en) * | 2019-12-17 | 2020-06-19 | 北京清网华科技股份有限公司 | Analog signal peak value monitoring and measuring device and measuring method thereof |
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| CN109245770B (en) | 2023-11-14 |
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