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Audio Signal Processing

Amplifier-with-distortion-reducing-feedback

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Amplifier with distortion reducing feedback

Details

Inventors: Inohana, Haruyuki;
Assignee: Pioneer Electronic Corporation (Tokyo, JP)
Primary Examiner: Mottola; Steven
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas

An amplifier device comprises an amplifier circuit, a differential amplifier for amplifying the difference between an input and an output of the amplifier circuit with an amplification degree which is substantially equal to one, and an addition circuit for adding an input signal to an output signal of the differential amplifier circuit and applying the result of addition to the input terminal of the amplifier circuit. Thereby, the distortion of the amplifier circuit is eliminated, and the input signal and the output signal coincide with each other. Hence, by applying the technical concept of the invention to an amplifier with a feedback loop, the distortion factor can be reduced without the increasing of the amount of feedback.

DETAILED DESCRIPTION Accordingly, an object of the invention is to provide an amplifier device in which the distortion can be decreased sufficiently.
An amplifier device according to this invention comprises: an amplifier circuit; a differential amplifier for amplifying the difference between the input and output signals of the amplifier circuit by an amplification degree which is substantially equal to one; and an addition circuit for adding an input signal to an output signal of the differential amplifier circuit, and applying the result of addition to the input terminal of the amplifier circuit.
In the amplifier device of the invention, the output of the differential amplifier adapted to amplify the difference between the input and output signals of the amplifier circuit is applied to the addition circuit, where it is added to an input signal of applied to the addition circuit, whereby the non-linearity of the transfer characteristic of the amplifier circuit is corrected, and accordingly the output signal includes no distortion.

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