Amplifier with distortion reducing feedback
AssigneePioneer Electronic Corporation
InventorHaruyuki Inohana
Life of this patent
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Abstract
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.
Claims4
An amplifier device comprising:
- a first differential amplifier whose inputs are connected to an input signal source and the output of a feedback circuit;
- an output buffer amplifier circuit whose output is an amplifier device output signal and whose output is also connected to an input of said feedback circuit;
- a second differential amplifier for amplifying the difference between an input and an output of said output buffer amplifier circuit with an amplification degree which is substantially equal to one;
- and
- an addition circuit for adding an output signal of said first differential amplifier to an output signal of said second differential amplifier circuit, and applying the result of addition to the input of said output buffer amplifier circuit.
Dependencies are inferred from the claim text.