Variable gain peak detector

Details Variable gain peak detector Variable gain peak detector

1996-09-26

1998-09-01

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including gain control means

327 59, H03G 330

Patent

active

058015876

ABSTRACT:
An improved peak detector for an audio limiter is disclosed where the audio limiter comprises preferably a voltage controlled amplifier and the feedback detector in a feedback arrangement. The peak detector has a resistive capacitive load and either charges or discharges more rapidly when the difference between the output of the peak detector and the output of the voltage controlled amplifier increases. As a result, over much of the range of operation of that difference, the charging or discharging current is linear with the output of the amplifier to provide a constant transconductance gain. However, when the difference exceeds a predetermined maximum, the circuit limits that current, thereby, decreasing the transconductance gain of the circuit.

REFERENCES:
patent: 5546027 (1996-08-01), Shinozaki et al.
Exar Corporation, product information, Sep. 1996, XR-1072--BBE Sound Enhancement Audio Processor
Exar Corporation, product information, Aug. 1995, XR-1071--BBE II High Defintion Audio Processor.

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