Patent ID: 6801059
Filing Date: 2004-10-05
Classification: H03K

Abstract:
A comparator that generates an output signal by comparing a first input voltage to a second input voltage, the comparator comprising:a bias voltage generator that produces a first bias voltage and a second bias voltage; a common voltage detector that generates a common voltage detection signal responsive to the first and second input voltages; and an input stage circuit that adjusts a voltage difference between the first input voltage and the second input voltage, wherein a first common voltage of the stage circuit is combined with a first offset voltage when the common voltage detection signal is a first level, wherein a second common voltage of the imput stage circuit is combined with a second offset voltage when the common voltage detection signal is a second level, and wherein the input stage circuit is coupled to the bias voltage generator to receive the first and second bias voltages and coupled to the common voltage detector to receive the common voltage detection signal.