Variable-gain amplifying circuit

Details Variable-gain amplifying circuit Variable-gain amplifying circuit

1985-07-02

1987-02-24

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330 86, 330143, 330254, H03G 330

Patent

active

046460292

ABSTRACT:
Herein disclosed is a variable gain amplifying circuit which comprises a heating element, a heat-sensitive resistance coupled thermally to the heating element, an amplifier including the heat-sensitive resistance, and means for controlling the heat of the heat element. This heat of the heating element is controlled so as to control the value of the heat-sensitive resistance. As a result that the value of the heat-sensitive resistance is controlled, the gain of that amplifier is controlled.

REFERENCES:
patent: 3828292 (1974-08-01), Grossman et al.
patent: 4013971 (1977-03-01), Sternbeck
patent: 4166981 (1979-09-01), Marchasson et al.
patent: 4468631 (1984-08-01), Goldberg
patent: 4547743 (1985-10-01), Goto

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