Patent ID: 7532041
Filing Date: 2009-05-12
Classification: H03K

Abstract:
1. A programmable hysteresis comparator circuit, the circuit comprising: a comparator output; a comparator input circuit, wherein the comparator input circuit is operable to receive a first voltage input and a second voltage input, and to provide a first differential current output based at least in part on a difference between the first voltage input and the second voltage input; a hysteresis control circuit, wherein the hysteresis control circuit is operable to receive a single programmable voltage input, and to provide a second differential current output based at least in part on the comparator output and the single programmable voltage input; an output circuit, wherein the output circuit sums the first differential current and the second differential current, and provides the comparator output based at least in part on the sum of the first differential current and the second differential circuit; a trim control circuit, wherein the trim control circuit is operable to receive a programmable trim input, and to provide a third differential current output based at least in part on the programmable trim input; and wherein the output circuit is further operable to sum the third differential current with the first differential current and the second differential current, and wherein the comparator output is based at least in part on the sum of the first differential current, the second differential current, and the third differential current.