CN104124959A - High frequency signal linear optical coupler isolation transmission circuit capable of reducing noise - Google Patents
High frequency signal linear optical coupler isolation transmission circuit capable of reducing noise Download PDFInfo
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- CN104124959A CN104124959A CN201410358017.4A CN201410358017A CN104124959A CN 104124959 A CN104124959 A CN 104124959A CN 201410358017 A CN201410358017 A CN 201410358017A CN 104124959 A CN104124959 A CN 104124959A
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- optical coupling
- optical coupler
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Abstract
The invention discloses a high frequency signal linear optical coupler isolation transmission circuit capable of reducing noise. The high frequency signal linear optical coupler isolation transmission circuit capable of reducing the noise comprises operational amplifiers N1, N2 and N3, a linear optical coupler N4 and resistors from R1 to R5, wherein all the above components are connected through a PCB (printed circuit board) lead wire, the operational amplifier N1 and the resistor R1 form a negative feedback amplifier circuit of the linear optical coupler, the operational amplifier N2 and the operational amplifier N3, the resistor R2 and the resistor R4, and the resistor R3 and the resistor R5 respectively form coupled current signal amplification circuits, and current signals in the linear optical coupler are amplified, and respectively used as input of the negative feedback amplifier circuit and isolation transportation signal output of the linear optical coupler. Current signals in the linear optical coupler is small in magnitude and easily influenced by the noise, but current signals after being amplified can effectively reduce noise influences, and interference resistance of transmission signals is improved. Simultaneously, a negative feedback circuit uses a current amplification mode, a capacitor is removed form the negative feedback circuit, and therefore the bandwidth of the linear optical coupler can be significantly improve roved, and transmission of high frequency signal is isolated.
Description
Technical field
The present invention relates to a kind of high-frequency signal linear optical coupling isolation and transmission circuit, particularly a kind of high-frequency signal linear optical coupling isolation and transmission circuit that can noise reduction.
Background technology
Linear optical coupling is a kind of infrared light-emitting device and infrared receiver device and signal processing circuit etc. to be encapsulated in to the device in same base, because its good performance and antijamming capability are widely used in the electrical isolation of input and output signal.Develop especially extremely rapid in occasions such as the linear isolation of power technology, electric weight feedback, current sense, electrical transformations.But, in the time that the linear coupling that utilizes linear optical coupling is directly isolated transmission to analog signal, due to the voltage-current characteristic of linear optical coupling interior light emitting diodes and phototriode, make " linear zone " of linear optical coupling in fact smaller, especially feed back connection linear optical coupling bandwidth not high, be difficult to be applied to high frequency analog signals transmission.On current is less simultaneously, and general maximum, in μ A level, is easy to be subject to noise jamming, causes signal transmission to have distortion.
Typical case's high-precision linear light-coupled isolation transmission circuit is made up of linear optical coupling N4, operational amplifier N1, resistor R1 and capacitor C1, operational amplifier N1, resistor R1 and capacitor C1 form negative feedback amplifier circuit, the input of operational amplifier N1 is connected to the two ends of photodiode PD1 in linear optical coupling N4, and input signal is connected to the negative electrode of PD1 by resistor R2; PD2 forms the output of isolation change-over circuit.Wherein capacitor C1 plays feedback effect, noise reduction filtering simultaneously, but along with the raising of frequency, impedance will diminish, the primary current of linear optical coupling increases, it is large that gain becomes thereupon, thereby the introducing of electric capacity to passage, the gain when the high frequency has certain influence, reduce capacitance and can expand bandwidth, still, can affect the gain of operational amplifier, noise signal is also difficult for by filtering simultaneously.
Summary of the invention
the invention discloses a kind of high-frequency signal linear optical coupling isolation and transmission circuit that can noise reduction, solve typical linear light-coupled isolation transmission circuit noise large, the problem of high-frequency signal transmission distortion.
A kind of high-frequency signal linear optical coupling isolation and transmission circuit that can noise reduction, comprise: operational amplifier N1, resistor R1, resistor R2 and linear optical coupling N4, also comprise: operational amplifier N2, operational amplifier N3, resistor R3, resistor R4 and resistor R5, described linear optical coupling N4, comprising: LED, photodiode PD1 and photodiode PD2.
Input signal Vin end is connected with the reverse input end of operational amplifier N1, and the reverse input end of operational amplifier N1 is connected with one end of resistor R3 with one end of resistor R2 respectively; The positive input ground connection of operational amplifier N1; One end of resistor R1 is connected with the output of operational amplifier N1, and the other end of resistor R1 is connected with the negative electrode of the LED of linear optical coupling N4; The anode of the LED of linear optical coupling N4 connects power supply, and the negative electrode of photodiode PD1 is connected with the resistor R2 other end, is connected with the positive input of operational amplifier N2 simultaneously; The anode of the photodiode PD1 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N2, is connected with the output of operational amplifier N2 with the other end of resistor R3 simultaneously; The anode of the photodiode PD2 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N3, is connected with the output of operational amplifier N3 with one end of resistor R5 simultaneously; The negative electrode of the photodiode PD2 of linear optical coupling N4 is connected with the positive input of operational amplifier N3, is connected with one end of resistor R4 simultaneously; The other end short circuit of the other end of resistor R4 and resistor R5 is as output Vout.Each components and parts connect by printed conductor.
Operational amplifier N1, resistor R1 form the negative feedback amplifier circuit of linear optical coupling N4, operational amplifier N2, resistor R2 and resistor R3 form current signal amplifier circuit, operational amplifier N3, resistor R4 and resistor R5 form current signal amplifier circuit, two current signal amplifier circuits duality relation each other; Linear optical coupling N4 internal current signal is amplified, export as input and the linear optical coupling N4 isolation transport signal of negative feedback amplifier circuit respectively.
Because linear optical coupling internal current signal magnitude is very little, easily affected by noise, and can effectively reduce noise effect through the current signal amplifying, improve the anti-interference of signal transmission.Negative-feedback circuit adopts electric current to amplify mode simultaneously, cancels electric capacity, can significantly improve linear optical coupling bandwidth, isolation transmitting high-frequency signal.
Brief description of the drawings
A kind of high-frequency signal linear optical coupling isolation and transmission circuit that can noise reduction of Fig. 1.
Embodiment
A kind of high-frequency signal linear optical coupling isolation and transmission circuit that can noise reduction, comprise: operational amplifier N1, resistor R1, resistor R2 and linear optical coupling N4, also comprise: operational amplifier N2, N3, resistor R3, resistor R4 and resistor R5, wherein, linear optical coupling N4, comprising: LED, photodiode PD1 and photodiode PD2.
Input signal Vin end is connected with the reverse input end of operational amplifier N1, and the reverse input end of operational amplifier N1 is connected with one end of resistor R3 with one end of resistor R2 respectively; The positive input ground connection of operational amplifier N1; One end of resistor R1 is connected with the output of operational amplifier N1, and the other end of resistor R1 is connected with the negative electrode of the LED of linear optical coupling N4; The anode of the LED of linear optical coupling N4 connects power supply, and the negative electrode of photodiode PD1 is connected with the resistor R2 other end, is connected with the positive input of operational amplifier N2 simultaneously; The anode of the photodiode PD1 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N2, is connected with the output of operational amplifier N2 with the other end of resistor R3 simultaneously; The anode of the photodiode PD2 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N3, is connected with the output of operational amplifier N3 with one end of resistor R5 simultaneously; The negative electrode of the photodiode PD2 of linear optical coupling N4 is connected with the positive input of operational amplifier N3, is connected with one end of resistor R4 simultaneously; The other end short circuit of the other end of resistor R4 and resistor R5 is as output Vout.Each components and parts connect by printed conductor.
Operational amplifier N1, resistor R1 form the negative feedback amplifier circuit of linear optical coupling, operational amplifier N2, resistor R2 and resistor R3 form current signal amplifier circuit, operational amplifier N3, resistor R4 and resistor R5 form current signal amplifier circuit, two current signal amplifier circuits duality relation each other; Linear optical coupling internal current signal is amplified, export as input and the linear optical coupling isolation transport signal of negative feedback amplifier circuit respectively.Because linear optical coupling internal current signal magnitude is very little, easily affected by noise, and can effectively reduce noise effect through the current signal amplifying, improve the anti-interference of signal transmission.Negative-feedback circuit adopts electric current to amplify mode simultaneously, cancels electric capacity, can significantly improve linear optical coupling bandwidth, isolation transmitting high-frequency signal.
The present invention can effectively solve the impact of linear optical coupling noise jamming, and expands bandwidth and realize linear optical coupling frequency applications.
Claims (1)
- One kind can noise reduction high-frequency signal linear optical coupling isolation and transmission circuit, comprise: operational amplifier N1, resistor R1, resistor R2 and linear optical coupling N4, characterized by further comprising: operational amplifier N2, operational amplifier N3, resistor R3, resistor R4 and resistor R5, described linear optical coupling N4, comprising: LED, photodiode PD1 and photodiode PD2;Input signal Vin end is connected with the reverse input end of operational amplifier N1, and the reverse input end of operational amplifier N1 is connected with one end of resistor R3 with one end of resistor R2 respectively; The positive input ground connection of operational amplifier N1; One end of resistor R1 is connected with the output of operational amplifier N1, and the other end of resistor R1 is connected with the negative electrode of the LED of linear optical coupling N4; The anode of the LED of linear optical coupling N4 connects power supply, and the negative electrode of photodiode PD1 is connected with the resistor R2 other end, is connected with the positive input of operational amplifier N2 simultaneously; The anode of the photodiode PD1 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N2, is connected with the output of operational amplifier N2 with the other end of resistor R3 simultaneously; The anode of the photodiode PD2 of linear optical coupling N4 is connected with the reverse input end of operational amplifier N3, is connected with the output of operational amplifier N3 with one end of resistor R5 simultaneously; The negative electrode of the photodiode PD2 of linear optical coupling N4 is connected with the positive input of operational amplifier N3, is connected with one end of resistor R4 simultaneously; The other end short circuit of the other end of resistor R4 and resistor R5 is as output Vout; Each components and parts connect by printed conductor;Operational amplifier N1, resistor R1 form the negative feedback amplifier circuit of linear optical coupling N4, operational amplifier N2, resistor R2 and resistor R3 form current signal amplifier circuit, operational amplifier N3, resistor R4 and resistor R5 form current signal amplifier circuit, two current signal amplifier circuits duality relation each other; Linear optical coupling N4 internal current signal is amplified, export as input and the linear optical coupling N4 isolation transport signal of negative feedback amplifier circuit respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410358017.4A CN104124959B (en) | 2014-07-25 | 2014-07-25 | A kind of can noise reduction high-frequency signal linear optical coupling isolation transmission circuit |
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| CN201410358017.4A CN104124959B (en) | 2014-07-25 | 2014-07-25 | A kind of can noise reduction high-frequency signal linear optical coupling isolation transmission circuit |
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| CN104124959A true CN104124959A (en) | 2014-10-29 |
| CN104124959B CN104124959B (en) | 2017-03-15 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669503A (en) * | 2018-12-13 | 2019-04-23 | 朱嘉慧 | Isolated amplifier and its controlled ratio source and integral controlled source and mutual coupling device |
| CN113225069A (en) * | 2021-04-06 | 2021-08-06 | 中国船舶重工集团公司第七0三研究所 | Anti-interference isolation circuit for current communication bus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102130590B (en) * | 2011-02-28 | 2013-07-17 | 徐工集团工程机械股份有限公司江苏徐州工程机械研究院 | Control method of proportional valve output compensation circuit |
| CN103023328B (en) * | 2011-09-28 | 2016-01-20 | 中国科学院微电子研究所 | The isolated measure voltage & current control circuit of high-voltage switch power supply |
| CN103259980B (en) * | 2013-05-22 | 2016-03-09 | 北京工业大学 | A kind of TDI ccd output signal preprocessor |
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2014
- 2014-07-25 CN CN201410358017.4A patent/CN104124959B/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109669503A (en) * | 2018-12-13 | 2019-04-23 | 朱嘉慧 | Isolated amplifier and its controlled ratio source and integral controlled source and mutual coupling device |
| CN109669503B (en) * | 2018-12-13 | 2022-06-28 | 朱嘉慧 | Isolation amplifier and proportional controlled source, integral controlled source and mutual coupler thereof |
| CN113225069A (en) * | 2021-04-06 | 2021-08-06 | 中国船舶重工集团公司第七0三研究所 | Anti-interference isolation circuit for current communication bus |
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| CN104124959B (en) | 2017-03-15 |
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