Operational amplifier for class B amplification

Details Operational amplifier for class B amplification Operational amplifier for class B amplification

1996-04-19

1998-05-19

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330264, 330268, H03F 330

Patent

active

057540780

ABSTRACT:
A first current mirror circuit 6 inversion amplifies the output voltage of an operational amplifier 10 with high potential power supply potential V.sub.DD to a voltage with a ground potential as a reference, thus driving a p-MOS transistor Q.sub.P3 of a push-pull output stage 19. A second current mirror circuit 7 inversion amplifies the output voltage of the operational amplifier 10 with the ground potential as a reference to a voltage with high potential power supply voltage V.sub.DD as a reference, thus driving the n-MOS transistor Q.sub.N3 in the push-pull output stage 19. Thus push-pull output stage through current when the input voltage is suddenly switched is eliminated and crossover distortion is reduced.

REFERENCES:
patent: 4296382 (1981-10-01), Hoover
patent: 4987381 (1991-01-01), Butler
patent: 5361041 (1994-11-01), Lish
Large Swing CMOS Power Amplifier, Kevin E. Brehmer and James B. Wieser pp. 624-629, Dec. 1983, IEEE J. of Solid-State Circuits, vol. SC-18, No. 6.
A High-Performance CMOS Amplifier, John A. Fisher; pp. 1200-1205 Dec. 1985 IEEE J. of Solid-State Circuits, vol. SC-20, No. 6.

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