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公开(公告)号：US4885547A
公开(公告)日：1989-12-05
申请号：US215964
申请日：1988-07-07
CPC分类号： H03G3/001 , H03G1/0023
摘要： 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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