CN102931935A - Low-cost program-controlled amplification circuit - Google Patents
Low-cost program-controlled amplification circuit Download PDFInfo
- Publication number
- CN102931935A CN102931935A CN2012104874509A CN201210487450A CN102931935A CN 102931935 A CN102931935 A CN 102931935A CN 2012104874509 A CN2012104874509 A CN 2012104874509A CN 201210487450 A CN201210487450 A CN 201210487450A CN 102931935 A CN102931935 A CN 102931935A
- Authority
- CN
- China
- Prior art keywords
- low
- resistance
- feedback resistance
- amplifying circuit
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Landscapes
- Amplifiers (AREA)
Abstract
The invention discloses a low-cost program-controlled amplification circuit which comprises an operational amplifier A1, an input resistor Rin, switches D0-D3, a feedback resistor R8, a feedback resistor R4, a feedback resistor R2 and a feedback resistor R1. The low-cost program-controlled amplification circuit is used for the program-controlled amplification of voltage signals, and has the advantages of wide range, high accuracy and low cost.
Description
Technical field
The invention belongs to power industry voltage signal amplification sector, particularly a kind of low-cost programmable amplifying circuit.
Background technology
In the field that power industry is controlled automatically, often need to measure multiple signals, need thus high-gain and wide gain-adjusted scope, with the wide region of adaptation signal power level.Use the programmable amplifying circuit of microprocessor controls switch, all play an important role at aspects such as improving amplification precision, increase gain-adjusted scope.
Summary of the invention
Order of the present invention is to provide a kind of switching value partition method of the direct voltage input for power industry.
The technical scheme that realizes above-mentioned purpose is: a kind of low-cost programmable amplifying circuit, it comprises operational amplifier A 1, input resistance Rin, switch D0-D3, feedback resistance R8, feedback resistance R4, feedback resistance R2 and feedback resistance R1.
Above-mentioned a kind of low-cost programmable amplifying circuit, wherein: described operational amplifier is that A1 is a kind of Low Drift Temperature type amplifier.
Above-mentioned a kind of low-cost programmable amplifying circuit, wherein: described operational amplifier A 1 positive input end grounding, be in series with described input resistance Rin between inverting input and the input signal Vin, be in series with the parallel circuits of described switch D0-D3 and described feedback resistance R8, R4, R2, R1 composition between inverting input and the described operational amplifier A 1 output end vo ut.
Above-mentioned a kind of low-cost programmable amplifying circuit, wherein: the resistance between described feedback resistance R8, R4, R2, the R1 is closed and is: R8=2R4=4R2=8R1.
Above-mentioned a kind of low-cost programmable amplifying circuit, wherein: circuit output Vout can be according to the different voltage multiple of switching combined situation output of described switch D0-D3.
The invention has the beneficial effects as follows: be used for the program control amplification of power industry voltage signal, have wide ranges, precision is high, cost is low advantage.
Description of drawings
Fig. 1 is structural representation of the present invention.
Embodiment
The invention will be further described below in conjunction with accompanying drawing.
See also Fig. 1, provided a kind of low-cost programmable amplifying circuit among the figure, it comprises operational amplifier A 1, input resistance Rin, switch D0-D3, feedback resistance R8, feedback resistance R4, feedback resistance R2 and feedback resistance R1.
Operational amplifier is that A1 is a kind of Low Drift Temperature type amplifier, its positive input end grounding, be in series with described input resistance Rin between inverting input and the input signal Vin, be in series with the parallel circuits of described switch D0-D3 and described feedback resistance R8, R4, R2, R1 composition between inverting input and the described operational amplifier A 1 output end vo ut.
Resistance between feedback resistance R8, R4, R2, the R1 is closed: R8=2R4=4R2=8R1.
Operational amplifier A 1 normal phase input end and anti-phase input terminal potential equate that current flowing is 0, and establishing the feedback loop equivalent resistance is Rf, then has:
Vout=-Rf*(Vin/Rin) formula 1
When each branch switch is closed, place branch road place in circuit; When switch disconnected, place branch road resistance was infinitely great.
If the state that switch D0-D3 opens and closes is correspondence 0 and 1 respectively, then can draw:
Rf=1/[1/ (D0*R8)+1/ (D1*R4)+1/ (D2*R2)+1/ (D3*R1)] formula 2
Formula 2 substitution formula 1 can be got:
Vout=-1/【1/(D0*R8)+1/(D1*R4)+1/(D2*R2)+1/(D3*R1)】*（Vin/Rin）
Formula 3
Can be found out by formula 2, output voltage Out can obtain different multiplication factors according to the switching combined situation of switch D0-D3, because it is R8=2R4=4R2=8R1 that the resistance between feedback resistance R8, R4, R2, the R1 is closed, and then can obtain 16 grades of different multiplication factors.
Principle of the present invention is: utilize amplifier to form negative feedback amplifier circuit, utilize switch to form resistor network and realize program control amplification.
Below embodiment has been described in detail the present invention by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the present invention according to the above description.Thereby some details among the embodiment should not consist of limitation of the invention, and the scope that the present invention will define with appended claims is as protection scope of the present invention.
Claims (5)
1. low-cost programmable amplifying circuit, it comprises operational amplifier A 1, input resistance Rin, switch D0-D3, feedback resistance R8, feedback resistance R4, feedback resistance R2 and feedback resistance R1.
2. described a kind of low-cost programmable amplifying circuit according to claim 1 is characterized in that described operational amplifier is that A1 is a kind of Low Drift Temperature type amplifier.
3. described a kind of low-cost programmable amplifying circuit according to claim 1, it is characterized in that, described operational amplifier A 1 positive input end grounding, be in series with described input resistance Rin between inverting input and the input signal Vin, be in series with the parallel circuits of described switch D0-D3 and described feedback resistance R8, R4, R2, R1 composition between inverting input and the described operational amplifier A 1 output end vo ut.
4. described a kind of low-cost programmable amplifying circuit according to claim 1 is characterized in that, the resistance between described feedback resistance R8, R4, R2, the R1 is closed and is: R8=2R4=4R2=8R1.
5. described a kind of low-cost programmable amplifying circuit according to claim 1 is characterized in that, circuit output Vout can be according to the different voltage multiple of switching combined situation output of described switch D0-D3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104874509A CN102931935A (en) | 2012-11-26 | 2012-11-26 | Low-cost program-controlled amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012104874509A CN102931935A (en) | 2012-11-26 | 2012-11-26 | Low-cost program-controlled amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102931935A true CN102931935A (en) | 2013-02-13 |
Family
ID=47646665
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012104874509A Pending CN102931935A (en) | 2012-11-26 | 2012-11-26 | Low-cost program-controlled amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102931935A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226225A (en) * | 2016-12-13 | 2018-06-29 | 财团法人工业技术研究院 | Electronic device for separating formation potential signal and measuring circuit noise |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270972A (en) * | 2011-04-18 | 2011-12-07 | 上海信朴臻微电子有限公司 | Variable-gain amplifier |
| CN102412798A (en) * | 2011-12-09 | 2012-04-11 | 杭州士兰微电子股份有限公司 | Radio frequency modulation output circuit and gain compensation amplifier thereof |
-
2012
- 2012-11-26 CN CN2012104874509A patent/CN102931935A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270972A (en) * | 2011-04-18 | 2011-12-07 | 上海信朴臻微电子有限公司 | Variable-gain amplifier |
| CN102412798A (en) * | 2011-12-09 | 2012-04-11 | 杭州士兰微电子股份有限公司 | Radio frequency modulation output circuit and gain compensation amplifier thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108226225A (en) * | 2016-12-13 | 2018-06-29 | 财团法人工业技术研究院 | Electronic device for separating formation potential signal and measuring circuit noise |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN203882224U (en) | Program-controlled constant-current source circuit | |
| CN102200791A (en) | Low dropout linear regulator structure | |
| CN202133708U (en) | Current detection circuit | |
| CN102654828A (en) | Method for increasing response speed of analog adder, analog adder and transformer | |
| CN103023434A (en) | Memristor based frequency-adjustable sine wave oscillating circuit | |
| CN204009924U (en) | A kind of high precision absolute value circuit | |
| CN102496909B (en) | Simple leakage protector with multi-gear adjustable protection values and action time | |
| CN104375546A (en) | Chopped wave band-gap reference device with switched-capacitor filter | |
| CN203422416U (en) | High-end current detection circuit | |
| CN102931935A (en) | Low-cost program-controlled amplification circuit | |
| CN103051308A (en) | Square wave and sawtooth wave generation circuit based on memristor | |
| CN204539123U (en) | Novel VI converts analogue quantity output circuit | |
| CN203773393U (en) | Negative-voltage constant current source circuit | |
| CN209513895U (en) | A kind of current sampling circuit for motor control | |
| CN202648785U (en) | Circuit used for eliminating electronic weighing zero drift | |
| CN103762984A (en) | Non-communication type remote analog acquisition device | |
| CN102957421A (en) | Frequency generator circuit without changes along with voltage | |
| CN201797509U (en) | Circuit realizing summation of voltages | |
| CN205017283U (en) | Bipolarity voltage follower circuit | |
| CN102684623B (en) | A kind of see-saw circuit based on the modulation of input branch switch | |
| CN204597933U (en) | Radio frequency matrix switch load detecting circuit | |
| CN202940792U (en) | Frequency generator circuit unchanged with voltage change | |
| CN102931995A (en) | Low-cost rapid digital-analog conversion method | |
| CN204517686U (en) | Voltage stabilizing full-wave rectifying circuit | |
| CN203606655U (en) | Amplification circuit capable of selecting amplification factors automatically |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130213 |