Amplifier with compressor and expander function for ground symme

Details Amplifier with compressor and expander function for ground symme Amplifier with compressor and expander function for ground symme

1986-07-17

1988-07-19

Wan, Gene

Amplifiers

Hum or noise or distortion bucking introduced into signal...

330284, H03F 120, H03G 318

Patent

active

047587970

ABSTRACT:
An amplifier for ground symmetrical signals includes a compressor at the input and an expander at the output, with the slope of at least one of its expansion or compression characteristics being adjustable for at least one half-wave polarity with the aid of an adjustment voltage. In order to reduce second order distortions at the amplifier output, a circuit is provided for determining the arithmetic mean value of the voltage across the amplifier output. A control value is produced from the determined mean value and the slope of the expansion or compression characteristic is regulated with this control value in the opposite direction so that the distortions are reduced.

REFERENCES:
patent: 4187478 (1980-02-01), Endoh et al.
patent: 4514702 (1985-04-01), Zogg
Tietze, Schenk, "Halbleiter-Schaltungstechnik", 2nd Edition Springer-Verlag, 1971, p. 282 et seq.

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