Low power class AB unity gain buffer circuit

Details Low power class AB unity gain buffer circuit Low power class AB unity gain buffer circuit

1998-07-24

2000-09-26

Cunningham, Terry D.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327581, 326 83, H03K 300

Patent

active

061247405

ABSTRACT:
A circuit for providing unity gain buffering of an input signal with reduced power consumption and symmetrical load driving capability. A feedback circuit between a buffer transistor and a bias circuit modulates the bias current to the buffer transistor. Modulating the bias current allows the buffer circuit to have a smaller quiescent bias current and increased current sink capability than the prior art unity gain buffer circuit. The modulating bias current allows more efficient operation of the buffer circuit while maintaining symmetrical load driving capability.

REFERENCES:
patent: 3974456 (1976-08-01), Rusell et al.
patent: 4573021 (1986-02-01), Widlar
patent: 5552741 (1996-09-01), Kolluri
Microelectronic Circuits, Adel Sedra et al. The ideal op amp pp. 70-71, 1982.

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