Comparison circuit having programmable hysteresis

Details Comparison circuit having programmable hysteresis Comparison circuit having programmable hysteresis

1976-06-30

1978-02-07

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307354, H03K 520

Patent

active

040728706

ABSTRACT:
A differential amplifier circuit suitable to be fabricated in monolithic integrated circuit form and having externally programmable, symmetrical input hysteresis. The differential amplifier circuit includes a differential input stage having a resistor coupled between the emitters of the differential transistors. A steering circuit comprising a second differential stage is connected across the resistor at the outputs of the collectors thereof. A differential to single ended converter circuit is utilized to provide output drive to an output multiple collector transistor from the differential input stage. A switching circuit is coupled between one collector of the output transistor to the steering circuit for selectively switching this circuit for steering current through the resistor. An external voltage is coupled across a component of the steering circuit for deriving temperature independent hysteresis. By switching the steering circuit, symmetrical hysteresis is obtained about a given level.

REFERENCES:
patent: 3467837 (1969-09-01), Vick
patent: 3538444 (1970-11-01), Adlhoch
patent: 3622802 (1971-11-01), Nunley
patent: 3628059 (1971-12-01), Niu
patent: 3648069 (1972-03-01), Frederiksen
patent: 3725673 (1973-04-01), Frederiksen et al.
patent: 3872323 (1975-03-01), Frederiksen et al.
patent: 3914704 (1975-10-01), Craft
patent: 3988595 (1976-10-01), Eatock
"Comparator With Hysteresis", by Gersbach in IBM Tech. Disclos. Bull., vol. 19, No. 1, Jun. 1976, p. 34.

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