Automatic gain control circuit

Details Automatic gain control circuit Automatic gain control circuit

1989-06-13

1990-05-22

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330279, H03F 345

Patent

active

049280740

ABSTRACT:
An automatic gain control circuit having a variable gain amplifier circuit, a signal level detecting circuit connected to the variable gain amplifier circuit for generating a detect signal the level of which changes in response to a signal level of an output signal of the variable gain amplifier circuit, and a gain control circuit for controlling the gain of the variable gain amplifier circuit in accordance with the signal level of the detect signal, and the gain control circuit having a differential amplifier circuit having first and second input terminals, the first and second input terminals being connected to the signal level detecting circuit for receiving the detect signal, a first reference voltage source connected to the first input terminal of the differential amplifier so that a first predetermined voltage is provided instead of the signal level of the detect signal in response to the signal level of the detect signal and a second reference voltage source connected to the second input terminal of the differential amplifier for providing a second predetermined voltage.

REFERENCES:
patent: 4124825 (1978-11-01), Webb et al.
patent: 4651210 (1987-03-01), Olson

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