Patent ID: 8330500
Filing Date: 2012-12-11
Classification: H03K

Abstract:
1. A comparator comprises: a current mirror, having a biasing end coupled to a power voltage, a first end, and a current outputting end coupled to an output node of the comparator; a differential input pair, having a first and second input ends for respectively receiving a first voltage and a second voltage, a second and third ends, and a ground end, wherein the third end is coupled to the first end; a first auxiliary circuit, coupled between the output node and the second end; a first switch, controlled by a second control signal to provide a ground connected to a second auxiliary circuit; a second switch, controlled by a third control signal to provide the ground connected to a third auxiliary circuit; the second auxiliary circuit, coupled between the output node and the first switch; and the third auxiliary circuit, coupled between the output node and the second switch; wherein the first, second, and third auxiliary circuits provide a minimum voltage of a comparison result output at the output node, wherein the comparison result is the power voltage when the first voltage is larger than the second voltage, and the comparison result is the minimum voltage when the first voltage is less than the second voltage.