Gain control amplifier circuit

Details Gain control amplifier circuit Gain control amplifier circuit

1978-10-23

1980-07-01

Mullins, James B.

Amplifiers

With control of power supply or bias voltage

With control of input electrode or gain control electrode bias

330136, H03G 326

Patent

active

042108748

ABSTRACT:
An amplifier having a gain control terminal amplifies an input signal to produce an output signal of a desired magnitude. A gain control circuit coupled between the input and output signals and to the control terminal includes detectors of the input and output signal amplitudes. The control circuit further includes a first impedance network connected to the control terminal and a feedback circuit connected in series therewith, the feedback circuit including a second impedance network complementary to the first impedance network. A feedback signal of the feedback circuit is multiplied by the amplitude of the input signal and combined with the amplitude of the output signal and a reference signal at a summing point of the feedback circuit to maintain a response time of the control circuit which is essentially invariant with respect to the amplitude of the input signal.

REFERENCES:
patent: 3781703 (1973-12-01), Duty
patent: 3900823 (1975-08-01), Sokal et al.
patent: 3918003 (1975-11-01), Seidel
patent: 3965436 (1976-06-01), Dixon
patent: 4035739 (1977-07-01), Dickopp et al.

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