Window comparator circuit

Details Window comparator circuit Window comparator circuit

1981-05-11

1983-10-11

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307261, 328147, H03K 5153, H03K 524, G01R 19165

Patent

active

044094973

ABSTRACT:
A window comparator circuit includes an input terminal, first and second reference voltage terminals to be supplied with first and second voltages different from each other, first and second comparators connected to one of the first and second reference voltage terminals and to the input terminal, and an output circuit connected to output terminals of the first and second comparators. The first comparator comprises first and second transistors whose bases are coupled to the first reference voltage terminal and input terminal and whose emitters are connected to each other, and a first constant current source for supplying a first current connected to commonly-connected emitters of the first and second transistors; the second comparator comprises third and fourth transistors whose bases are connected to the input terminal and second reference voltage terminal and whose emitters are connected to each other, and a second constant current source for supplying the first current connected to commonly-connected emitters of the third and fourth transistors; and the output circuit comprises a current mirror circuit to which is supplied with the sum of collector currents of the second and fourth transistors and to the output of which is connected to a third constant current source for supplying a second constant current which is a half of the first current, and an output transistor whose base is connected to an output terminal of the current mirror circuit.

REFERENCES:
patent: 4292552 (1981-09-01), Tanaka
patent: 4321482 (1982-03-01), Schroder et al.
J. G. Graeme, G. E. Tobey and L. P. Huelsman, Operational Amplifiers, pp. 364-366 (1971).

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