MOS Differential amplifier gain control circuit

Details MOS Differential amplifier gain control circuit MOS Differential amplifier gain control circuit

1982-01-24

1984-07-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, 330257, 330284, 330288, H03F 345, H03G 330

Patent

active

044595557

ABSTRACT:
A modulator circuit is disclosed in which a pair of differentially modulated direct currents are mirrored to an output. A control potential acts to vary the modulation without changing the direct current values. A CMOS version of a complete variable gain amplifier is detailed in which the common mode output is V.sub.CC /2 and is not changed with variations in the gain control potential or the input common mode potential.

REFERENCES:
patent: 371027 (1973-01-01), Addis et al.
patent: 4371843 (1983-02-01), Fang et al.

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