Multistage variable gain amplifier circuit

Details Multistage variable gain amplifier circuit Multistage variable gain amplifier circuit

1997-03-11

1999-05-04

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330310, H03F 345

Patent

active

059007818

ABSTRACT:
A multistage amplifier circuit comprises a current constant mode variable amplifying circuit for amplifying an input signal and current variable mode variable amplifying circuits and for further amplifying the signal amplified by the first variable amplifying circuit. An AGC voltage VAGC is commonly applied between the bases and emitters of an amplification degree control transistor of the current constant mode variable amplifying circuit and amplification degree control transistors of the current variable mode amplifying circuits. Collector currents of the transistors change exponentially with respect to the linearly-varied AGC voltage VAGC. Further, currents each proportional to the collector current of the constant mode variable amplifying circuit changes linearly with the AGC voltage VAGC.

REFERENCES:
patent: 3684974 (1972-08-01), Solomon et al.
patent: 4287476 (1981-09-01), Cense
patent: 5115317 (1992-05-01), Igarashi et al.
patent: 5206606 (1993-04-01), Yanaguchi et al.

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