Low standby current comparator having a zero temperature coeffic

Details Low standby current comparator having a zero temperature coeffic Low standby current comparator having a zero temperature coeffic

1990-11-30

1991-12-31

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307360, 307491, H03K 522, H03K 5153, H03F 130

Patent

active

050774913

ABSTRACT:
A comparator circuit is provided compatible with CMOS logic levels for the input signal and including a substantially zero standby current when the input signal is initially less than the upper trip threshold. The trip threshold follows a bandgap voltage with a zero temperature coefficient, while hysterisis is provided with the upper and lower trip thresholds. An alternate embodiment of the comparator circuit provides a selectable zero temperature coefficient for the trip threshold as a ratio of emitter resistors while maintaining the hysterisis with the upper and lower trip thresholds.

REFERENCES:
patent: 4072870 (1978-02-01), Davis
patent: 4122362 (1978-10-01), Hofmann
patent: 4132909 (1979-01-01), Nutz
patent: 4324990 (1982-04-01), Gay
patent: 4429234 (1984-01-01), Streit
patent: 4710793 (1987-12-01), Gray

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