Differential output, power, CMOS, operational amplifier

Details Differential output, power, CMOS, operational amplifier Differential output, power, CMOS, operational amplifier

1991-12-19

1993-05-18

Pascal, Robert J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330255, 330257, H03F 345

Patent

active

052124550

ABSTRACT:
A power CMOS operational amplifier with a differential output, having an intrinsically stable current absorption under rest conditions, comprises two symmetric branches, each comprising a first folded cascode input inverting stage, a level shifting circuit, a second currant mirror type noninverting amplifying stage and a third output inverting stage, constituted by a complementary pair of transistors, connected in a common source configuration between the supply rails and driven by the output of the second noninverting stage and by the output of the level shifting circuit. Frequency compensation is accomplished by means of two capacitors connected between each of the two output terminals of the amplifier and the output of the first inverting stage and a node of the output branch of the noninverting current mirror stage. A single common mode feedback network stabilizes both symmetric branches of the amplifier.

REFERENCES:
patent: 4697152 (1987-09-01), Westwick
patent: 4794349 (1988-12-01), Senderowicz et al.
patent: 4829266 (1989-05-01), Pernici
patent: 4912425 (1990-03-01), Kobayashi et al.
Tomasini, et al., "A Fully Differential CMOS Line Driver for ISDN," IEEE Journal of Solid-State Circuits 25(2):546-554, Apr. 25th 1990.

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