Comparator circuit

Details Comparator circuit Comparator circuit

1989-07-28

1990-11-13

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 307318, H03K 5153

Patent

active

049704125

ABSTRACT:
A comparator circuit with hysteresis does not require any bias current as long as the input signal applied thereto is less than a lower threshold value of the comparator. The comparator includes a current source for providing a plurality of currents when enabled, a Zener diode coupled to the current source for initially enabling the former as the input signal exceeds an upper threshold value, an output circuit which when rendered operative is placed in parallel to the Zener and disables the same while maintaining the current source enabled and providing an output signal from the comparator, and an amplifier responsive to the current source which renders the output circuit operative as the magnitude of current sourced thereto exceeds a predetermined value. A feature of the comparator circuit is that the currents flowing in the output circuit and amplifier have complementary temperature coefficients whereby the composite temperature coefficient of the upper and lower threshold values of the comparator can be adjusted to have a substantially zero temperature coefficient.

REFERENCES:
patent: 4258277 (1981-03-01), Nutz
patent: 4525638 (1985-06-01), Gray
patent: 4701639 (1987-10-01), Stanojevic
patent: 4710793 (1987-12-01), Gray

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