High frequency signal linear optical coupler isolation transmission circuit capable of reducing noise

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 [0001] The present invention involves a high -frequency signal linear optocoupler isolation transmission circuit, especially a high -frequency signal linear optocoupler transmission circuit with noise reduction. Background technique [0002] Linear optocoupler is a device that encapsulates infrared light emitting devices and infrared receiving devices and signal processing circuits in the same tube. It is widely used in electrical isolation of input and output signals due to its good performance and anti -interference ability.In the case of linear isolation, power feedback, current sensing, and power transformation of power technology, it has developed extremely rapidly.However, when using a linear optocoupler linear coupling directly to isolate the analog signal, due to the voltarity of the internal light -emitting diode and the optical triode in the linear optocoupler, the "linear zone" of the linear optocoupler is actually relatively small, especially the parti...

AI Technical Summary

Problems solved by technology

[0004] The present invention discloses a high-frequency signal linear optocoupler isolation transmission circuit that can reduce noise, which solves the problem of high-frequency signal transmission with high noise in typical linear optocoupler isolation transmission circuits. Distortion problem

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