Direct current servo circuit

Abstract

The invention discloses a direct current servo circuit. The servo circuit comprises: a direct current amplifier, wherein the positive-phase end of the direct-current amplifier is electrically connected with an alternating-current signal coupling network or a high-pass filter, the low-frequency response of the positive-phase end of the direct-current amplifier is reduced through the alternating-current signal coupling network or the high-pass filter, and the alternating-current signal coupling network or the high-pass filter is electrically connected with a direct-current signal input end; a frequency selection network, wherein the frequency selection network is electrically connected with the direct-current amplifier, the frequency selection network and the direct-current amplifier form an inverted amplifier, the low-frequency response of the negative-phase end of the direct-current amplifier is reduced through the frequency selection network, the alternating-current signal coupling network or the high-pass filter is electrically connected with the frequency selection network, and the frequency selection network is electrically connected with the direct current signal input end; and a coupling network, wherein the coupling network is connected with the output end of the direct current amplifier and the direct current signal output end. The direct current offset is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of amplifier circuits, in particular to a DC servo circuit. Background technique [0002] Most of the existing audio circuits are composed of differential circuits or various forms of symmetrical circuits. If the output midpoint DC voltage of the front-stage amplifier circuit is too high, this will cause the rear-stage power amplifier circuit to deviate from the original symmetrical working state, and thus cannot Better amplification of symmetrical audio signals. That is to say, the circuit with an offset in the output midpoint, in the case of obvious distortion, the amplified signal is already a distorted signal; more seriously, if the output midpoint offset DC voltage is too high , which will make the speakers connected to it not work well, and even burn the speakers connected to it in severe cases. To reduce the DC offset voltage at the output of the amplifier, it is generally improved by adding a zero-...

AI Technical Summary

Problems solved by technology

[0003] The existing DC servo circuit is generally composed of a low-pass filter and an integrating circuit. In order to be compatible with the current module and the voltage module, the existing DC servo circuit is designed more complicatedly, and multiple connecting lines are arranged in many places. It directly leads to the larger overall volume of the circuit; at the same time, the DC offset reduction effect at the output and input terminals is relatively general

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