Gain control circuit for obtaining a constant output signal ampl

Details Gain control circuit for obtaining a constant output signal ampl Gain control circuit for obtaining a constant output signal ampl

1983-02-28

1985-09-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including gain control means

330279, H03G 320

Patent

active

045409536

ABSTRACT:
A gain control circuit is disclosed. In accordance with the preferred embodiment of the invention, a negative feedback amplifier is connected between a reference voltage and a variable impedance circuit which controls the voltage to the input of a signal amplifier whose output defines the desired output voltage. The variable impedance circuit varies the input voltage to the signal amplifier as a function of the level of the output voltage appearing at the output of the signal amplifier. The output impedance of the negative feedback amplifier is chosen such that an A.C. signal appearing at its output end can be sufficiently attenuated. As a result, the input impedance to the variable impedance circuit is negligibly small with respect to an A.C. signal. As a result, the amplitude of the input signal is varied over a wide range in response to the impedance of the variable impedance circuit.

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