Gain control circuit

Details Gain control circuit Gain control circuit

1989-01-17

1990-04-17

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330282, H03G 300

Patent

active

049183974

ABSTRACT:
A gain control circuit includes a network (112) for splitting a first signal into first and second signal paths with the ratio of the values of the signals in the respective first and second paths being determined in operation by a digital control signal. The circuit includes an input stage (101) the output of which is connected to the input of network (102) so as to provide said first signal, said input stage (101) having a gain which is set by the value of the signal in said first signal path, and an output stage (104) the output of which is controlled by the signal in said second signal path.

REFERENCES:
patent: 3355670 (1967-01-01), Pastoriza
patent: 3500316 (1970-03-01), Brown
patent: 4451779 (1984-05-01), Griep
patent: 4628276 (1986-12-01), Mizutani
Vrba, "Highly Stable Circuits Based on Operational Amplifiers with an Electronic Switch at the Output", Radio Electron. & Commun. Sys., vol. 23, No. 8, 1980, pp. 38-43.
Intersil AD7523, "8-Bit Multiplying D/A Converter", pp. 6-7, 6-9, published by Integrated Circuit Manufacturers.
Digital-To-Analog Converters, "8-Bit Buffered Multiplying DAC", AD7524, vol. 1,9, pp. 171, 173, 175.

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