Programmable voltage hysteresis on a voltage comparator

Details Programmable voltage hysteresis on a voltage comparator Programmable voltage hysteresis on a voltage comparator

1993-01-11

1993-11-23

Zazworsky, John

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307359, 307362, H03K 524

Patent

active

052647404

ABSTRACT:
A programmable voltage comparator having a programmable hysteresis function controlling the comparator's output relative to first and second comparator input voltage variables. The programmable voltage comparator comprises an inverting and non-inverting input for receiving a first and second input voltages and an output providing a logic state signal reflecting the amplitude of the inverting and non-inverting input voltages. The comparator includes level shift circuitry coupled to the inverting and non-inverting inputs for programmably shifting the amplitude of the voltages applied to the inverting and non-inverting inputs responsive to the logic state output of the comparator. In one embodiment, the comparator includes a differential amplifier having inverting and non-inverting outputs, wherein the level shift circuitry comprises a first level shift circuit coupled to the non-inverting voltage input and having a feedback element coupling to the non-inverting output. A second level shift circuit is coupled to the inverting input with a feedback element coupled to the inverting output.

REFERENCES:
patent: 4384219 (1983-05-01), Davis
patent: 4602169 (1986-07-01), Shimizu
patent: 5039888 (1991-08-01), Bell et al.

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