A Follower Power Buffer Amplifier

Abstract

The invention discloses an unrestrictive line voltage-following and power-buffering amplifier, and belongs to the technical field of amplifiers. The unrestrictive line voltage-following and power-buffering amplifier comprises a first control circuit and a second control circuit symmetrical to the first control circuit, wherein the first control circuit comprises a reference voltage comparing, buffering and amplifying circuit and a power buffering and amplifying circuit; the reference voltage comparing, buffering and amplifying circuit comprises a first effect tube, a third triode, a fifth triode, a first constant current source circuit for providing working currents and a first current mirror circuit for providing bias currents; the power buffering and amplifying circuit comprises a nineteenth triode, a twentieth triode, a twenty fourth triode, a twenty seventh effect tube and a second constant current source circuit for providing driving currents. When a follower works dynamically, input bias voltage and output bias voltage form a peering relationship, so that input signal voltage is approximately equal to voltage output to a load and zero distortion amplification of a signal is achieved.

Description

technical field [0001] The invention belongs to the technical field of amplifiers, in particular to a follower power buffer amplifier. Background technique [0002] Among the current audio amplifiers, the voltage follower of the final stage is an important part of it. Most of the distortion is related to the voltage buffer amplifier of the final stage, such as intermodulation distortion, harmonic distortion, etc. The reason is that the follower Non-linear distortion caused by the non-proportional relationship between input voltage and output voltage. The reason for nonlinear distortion is that the input bias voltage of the follower cannot change with the output bias voltage when the signal voltage is input, that is to say, the input bias voltage and the output bias voltage are not in an equivalent relationship, resulting in nonlinear distortion of the amplifier. In order to solve the nonlinear distortion, people usually introduce a loop negative feedback circuit to correct...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the non-linear distortion problem caused by the non-proportional relationship between the input voltage and the output voltage of the follower in the audio amplifier, the present invention provides a follower power buffer amplifier, the input voltage and the output voltage of the follower are close to the equivalent linear relationship

Images