Patent ID: 6870403
Filing Date: 2005-03-22
Classification: H03K

Abstract:
1. A comparing circuit comprising: an input signal switching circuit having a first input terminal, a second input terminal, a first output terminal and a second output terminal, the input signal switching circuit configured to receive a first input signal inputted to the first input terminal and a second input signal inputted to the second input terminal, the input signal switching circuit further configured to switchably output the first input signal to one of the first and second output terminals and the second input signal to the other thereof in accordance with a polarity switching signal; a comparator having a reverse input terminal and a non-reverse input terminal the comparator configured to receive through the reverse input terminal a first signal outputted from the first output terminal, and receive through the non-reverse input terminal a second signal outputted from the second output terminal, the comparator comparing the first signal and the second signal so as to output a result signal representing a result of the comparison; and an output logic switching circuit configured to receive the result signal so as to switchably execute, in accordance with the polarity switching signal, one of a reversing process to reverse the result signal to output the reversed result signal and a non-reversing process to output the result signal.