Comparator circuit

Details Comparator circuit Comparator circuit

1981-12-11

1984-06-26

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307264, 307359, 307297, H03K 522

Patent

active

044568401

ABSTRACT:
A comparator circuit providing a hysteresis characteristic which does not change a hysteresis width even if a power supply voltage changes is disclosed. The comparator circuit comprises a differential amplifier including an input terminal, a reference terminal and an output terminal; an input voltage terminal to which an input voltage is applied; a reference voltage terminal to which a reference voltage is applied; at least one level shift means connected between said input voltage terminal and said input terminal, or between said reference voltage terminal and said reference terminal; a current source means connected to the output of said level shift means; and control means for controlling the current value of said current source means in accordance with the output level of said output terminal.

REFERENCES:
patent: 3673508 (1972-06-01), Callahan, Jr.
patent: 4114149 (1978-09-01), Kendall
patent: 4263562 (1981-04-01), Seiler
patent: 4358752 (1982-11-01), Tamada et al.

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