Gain control circuit

Details Gain control circuit Gain control circuit

1979-08-13

1981-09-29

Smith, Alfred E.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330254, H03G 300

Patent

active

042925967

ABSTRACT:
A circuit for varying the gain of an amplifier circuit linearly in decibel by the use of a digital code signal varying linearly, wherein a resistance network to be connected between an amplifier having a fixed gain and an input or output portion for the amplification is connected and the gain of the amplifier as well as the values of resistance elements constituting the resistance network is set so that the transfer function of the amplifier circuit may become: ##EQU1## .

REFERENCES:
patent: 3629720 (1971-12-01), Sedra et al.
Sedra, et al. "Simple Digitally-Controlled Variable-Gain Linear D.C. Amplifier", Electronic Eng., Mar. 1969 pp. 362-365.
Ottesen et al. "Digitally Controlled Amplifier Circuits", IBM Tech. Discl. Bulletin, vol. 16, No. 11, Apr. pp. 3504-3505 74.

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