Comparator with hysteresis for interfacing with a ground-referen

Details Comparator with hysteresis for interfacing with a ground-referen Comparator with hysteresis for interfacing with a ground-referen

1979-04-16

1981-08-25

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307290, 307352, 307557, H03K 508, H03K 500

Patent

active

042861764

ABSTRACT:
An interface circuit is disclosed for receiving a ground-referenced A.C. signal for detecting transitions of the A.C. signal about ground potential. An input transistor is enabled when the A.C. signal voltage falls below ground potential by one base-emitter forward drop. The input transistor is disabled when the A.C. signal voltage rises above ground potential by one base-emitter forward drop. A feedback circuit and a bias circuit are coupled to the input transistor for switching the threshold levels of the input transistor. The interface circuit employs a hysteresis-type switching action for improving noise immunity while providing a symmetric output waveform. The circuit requires only a single power supply and is suitable for fabrication as a highly dense, monolithic integrated circuit. Also, the circuit provides a low input impedance to large positive and negative voltage transients.

REFERENCES:
patent: 3666970 (1972-05-01), Abbott et al.
patent: 3754182 (1973-08-01), Morris
patent: 3988595 (1976-10-01), Eatock

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