Voltage comparator having hysteresis characteristics

Details Voltage comparator having hysteresis characteristics Voltage comparator having hysteresis characteristics

1988-12-23

1990-05-15

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307290, 328150, H03K 524, H03K 315

Patent

active

049260685

ABSTRACT:
A voltage comparator circuit with hysteresis characteristics includes a voltage comparator circuit for comparing an input signal voltage with a comparison reference voltage and outputting a comparison result, a resistor element connected between the reference potential terminal and the comparison reference voltage input terminal of the voltage comparator circuit, a first constant current source for supplying current into the comparison reference voltage terminal and a second constant current source for deriving current out of the comparison reference voltage input terminal, and a control circuit for selectively activating one of the first and second current sources, in accordance with the logic level of an output of the voltage comparator circuit.

REFERENCES:
patent: 4384219 (1983-05-01), Davis
patent: 4556805 (1985-12-01), Shoji
patent: 4581545 (1986-04-01), Beale et al.
patent: 4634897 (1987-01-01), Yoshioka
H. Kadota, "Operational Circuit and its Analysis by Experiments", Tokyo Denko University, Publishing Bureau (pp. 32-33).

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