Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

2005-01-18

2005-01-18

Nguyen, Patricia (Department: 2817)

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

C330S281000

Reexamination Certificate

active

06844780

ABSTRACT:
An automatic gain control circuit integrally fabricated on a semiconductor substrate. An AGC circuit17controls the gain of an intermediate-frequency amplifier circuit15so that the average level of the output signal (sound signal) of an AM detector16may be substantially constant. The AGC circuit17includes a time-constant circuit100, which comprises a charging circuit for intermittently charging the capacitor and a discharging circuit for intermittently discharging the same. By this intermittent charging and discharging of the capacitor having a small capacitance, a large time constant is set.

REFERENCES:
patent: 4837556 (1989-06-01), Matsushita et al.
patent: 6205095 (2001-03-01), Hisakado et al.
patent: 20010027090 (2001-10-01), Uesugi
patent: 20020047732 (2002-04-01), Akahori
patent: 54-71545 (1979-06-01), None
patent: 57-192120 (1982-11-01), None
patent: 7-22880 (1995-01-01), None
patent: 7-050534 (1995-02-01), None
patent: 10-079631 (1998-03-01), None

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