Selectively adding auxiliary frequency compensation...

Details Selectively adding auxiliary frequency compensation... Selectively adding auxiliary frequency compensation...

2007-09-18

2007-09-18

Nguyen, Patricia (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including signal feedback means

C330S294000, C330S109000

Reexamination Certificate

active

11127845

ABSTRACT:
A frequency compensation device for providing added compensation to an operational amplifier, such as a bipolar or MOS rail-to-rail output operational amplifier, when the output device of the operational amplifier is in saturation. The device comprises a detector circuit for detecting those conditions which can cause the output device to go into saturation. When saturation is detected, an auxiliary frequency compensation device provides added frequency. Thereby, in a normal mode of operation, the op-amp is not overcompensated. Yet, when an output device becomes saturated, the auxiliary compensation is added to improve stability and prevent the op-amp from becoming oscillatory.

REFERENCES:
patent: 5150270 (1992-09-01), Ernst et al.
patent: 5546045 (1996-08-01), Sauer
patent: 5548205 (1996-08-01), Monticelli
patent: 6384687 (2002-05-01), Maida
patent: 6515540 (2003-02-01), Prasad et al.
patent: 2006/0132112 (2006-06-01), Oswald et al.

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