Latching comparator with hysteresis

Details Latching comparator with hysteresis Latching comparator with hysteresis

1983-07-01

1985-11-19

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307530, 307288, H03K 524

Patent

active

045544689

ABSTRACT:
A self latching comparator circuit has upper and lower input offset voltages associated therewith to establish hysteresis in response to a differential input signal. The comparator circuit comprises a differential amplifier adapted to receive a differential input signal and first and second parallel current mirror circuits for producing upper and lower input offset voltages when each are respectively activated. Antisaturation means are provided for preventing the current mirror circuits from saturating. An output circuit is also provided which does not load the differential output and therefore provides for a well controlled hysteresis.

REFERENCES:
patent: 3848139 (1974-11-01), Holt, Jr.
patent: 4348602 (1982-09-01), Sauer
patent: 4406955 (1983-09-01), Lo Cascio
patent: 4430580 (1984-02-01), Lovelace

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