Variable gain amplifier

Details Variable gain amplifier Variable gain amplifier

1980-05-05

1983-08-02

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330107, 330282, H03F 134

Patent

active

043968902

ABSTRACT:
A variable gain amplifier includes an amplifier for amplifying an input signal, a switch controlled with a given duty factor and a smoothing filter connected to the switch. The filter and the switch constitutes a negative feedback loop for the amplifier of which amplification factor is variably controlled by varying the duty factor of the switch.

REFERENCES:
patent: 3787778 (1974-01-01), Carre et al.
patent: 4066976 (1978-01-01), Dickopp et al.
Caves et al., "Sampled Analog Filtering Using Switched Capacitor as Resistor-Equivalents" IEEE Journal of Solid State Circuits, vol. SC-12, No. 6, Dec. 1977.

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