Gain cell with digital control

Details Gain cell with digital control Gain cell with digital control

1988-07-07

1989-12-05

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330279, H03G 330

Patent

active

048855472

ABSTRACT:
A differential amplifier in the form of a Gilbert gain cell is controlled by a pair of input currents applied to a pair of differentially coupled transistor pairs. A digital signal is generated and input into a CMOS digital-to-analog converter (DAC). The DAC outputs a pair of currents on conductors which are maintained at virtual ground by the use of a current mirror and an operational amplifier. The control signals applied to the differentially coupled transistor pairs are generated as base currents of transistors conducting the DAC output currents.

REFERENCES:
patent: 4156283 (1979-05-01), Gilbert

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