Patent ID: 7595676
Filing Date: 2009-09-29
Classification: H03K

Abstract:
1. A comparator comprising: a first differential input stage including: a second differential input stage including: an output stage producing a comparator output voltage and having an input coupled to receive an output produced by the first and second differential input stages; a buffer that is coupled to the output stage; a first switch having an input electrode, a control electrode, a first output electrode, and a second output electrode, wherein the control electrode of the first switch is directly coupled to the buffer, and wherein the first input electrode of the first switch receives a first hysteresis voltage, and wherein the first output electrode of the first switch is coupled to the control electrode of the third input transistor; and a second switch having an input electrode, a control electrode, a first output electrode, and a second output electrode, wherein the control electrode of the second switch is directly coupled to the buffer, and wherein the first input electrode of the second switch receives a second hysteresis voltage, and wherein the first output electrode of the second switch is coupled to the control electrode of the fourth input transistor.