Gain cell with digital control
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United States of America Patent
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Dec 5, 1989
Grant Date -
N/A
app pub date -
Jul 7, 1988
filing date -
Jul 7, 1988
priority date (Note) -
Expired
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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.
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