Comparator circuit with Schmitt trigger hysteresis character

Details Comparator circuit with Schmitt trigger hysteresis character Comparator circuit with Schmitt trigger hysteresis character

2007-11-06

2007-11-06

Lam, Tuan T. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Particular stable state circuit

C327S063000, C327S064000, C327S065000, C327S066000, C327S067000, C327S068000, C327S052000, C327S053000, C327S090000, C327S077000

Reexamination Certificate

active

11406464

ABSTRACT:
A circuit and a method are provided to produce a novel comparator with Schmitt trigger hysteresis character. The circuit includes a current source which controls the magnitude of current flow through this comparator circuit. It has a first logic device which is turned ON by a reference voltage, and a second logic device is turned ON by a comparator input voltage. A first feedback device is turned ON by a negative comparator output. A first parallel resistor is connected in parallel to the first feedback device. A second feedback device is turned ON by a positive comparator output. A second parallel resistor is connected in parallel to the second feedback device. The first and second parallel resistors are used to provide the differential comparator with switching voltage offsets which result in the Schmitt trigger hysteresis character.

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