Electronically controlled variable gain amplifier

Details Electronically controlled variable gain amplifier Electronically controlled variable gain amplifier

1992-03-10

1993-06-15

Sikes, William L.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307264, 307353, 328142, 328151, 330279, H03G 300, H03K 1700

Patent

active

052202194

ABSTRACT:
An electronically controlled variable gain amplifier is disclosed which provides an output signal proportional to the value of an input signal multiplied by a gain factor, where the gain factor is in turn logarithmically proportional to the value of a gain control signal in the form of a digital word. The amplifier includes a capacitor, a sampler for periodically sampling the value of the input signal and storing the sampled value as a voltage on the capacitor, and circuits for periodically exponentially charging the capacitor after the input signal has been stored thereon for a duration which is directly proportional to the magnitude of the gain control signal. Also included is a circuit for periodically sampling and holding the voltage stored on the capacitor after each periodic charge, where the sampled and held voltage is the amplifier output signal.

REFERENCES:
patent: 3845398 (1974-10-01), Katz
patent: 4317052 (1982-02-01), Morris
patent: 4334195 (1982-06-01), Luce
patent: 4373141 (1983-02-01), Sanders
patent: 4700143 (1987-10-01), Anthony et al.
patent: 4785250 (1988-11-01), Lawton
patent: 4886986 (1989-12-01), Watanabe
Intel-Advance Information, "80C196KB 16-Bit High Performance CHMOS Microcontroller"; p. 6-81; Oct. 88.
Interl-"80C196KB User's Guide"; pp. 4-36 through 4-37; 1988.

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