Comparator circuit

Details Comparator circuit Comparator circuit

1991-02-13

1992-09-08

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307350, 307362, 307494, H03K 524

Patent

active

051461145

ABSTRACT:
A comparator circuit includes first and second transistors of one conduction type having bases receiving input signals, collectors with leads being connected to a first pole of a supply voltage source, and coupled emitters. A resistor is connected into the collector lead of one of the first and second transistors of the one conduction type. A transistor of another conduction type has a base-to-emitter path connected parallel to the resistor and a collector issuing an output signal. A current impressing device is connected between the coupled emitters of the first and second transistors of the one conduction type and a second pole of the supply voltage source. The current impressing device impresses a current at every operating temperature being equal to twice the quotient of the base-to-emitter voltage of the transistor of the other conduction type and the resistor.

REFERENCES:
patent: 4418290 (1983-11-01), Nagano
patent: 4529891 (1985-07-01), Oida
patent: 4542303 (1985-09-01), Jarrett et al.
patent: 4580069 (1986-04-01), Bynum
patent: 4634897 (1987-01-01), Yoshioka
patent: 4724339 (1988-02-01), Ishida
patent: 4825104 (1989-04-01), Yamakoshi et al.

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