Comparator circuit having hysteresis

Details Comparator circuit having hysteresis Comparator circuit having hysteresis

1981-06-01

1983-09-27

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 307362, H03K 5153, H03K 524

Patent

active

044069553

ABSTRACT:
A high-gain comparator circuit having an upper and lower input offset voltage associated therewith to establish hysteresis in response to a differential input signal supplied thereto. The output level state of the comparator circuit is caused to be switched from a first output level to a second output level in response to the differential input signal exceeding the upper offset voltage only after the hysteresis has been initiated whereby the comparator circuit is less susceptible to being caused to erroneously switch states due to noise transients. The comparator circuit comprises a differential amplifier adapted to receive the differential input signal for producing differential currents in first and second outputs thereof and includes first and second current mirror circuits coupled in parallel to the first and second differential outputs of the differential amplifier which produced the upper and lower input offset voltages in the comparator circuit when respectively activated.

REFERENCES:
patent: 3805093 (1974-04-01), Hodemaekers
patent: 3848139 (1974-11-01), Holt, Jr.
patent: 3872323 (1975-03-01), Frederiksen et al.

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