Patent ID: 6819273
Filing Date: 2004-11-16
Classification: H03M

Abstract:
An integrated circuit, comprising:an analog signal output unit which converts a digital output signal into at least one analog output signal, and outputs said at least one analog output signal; an analog signal input unit which converts at least one analog input signal received from an exterior into a digital input signal; a switch circuit which provides at least one signal path through which said at least one analog output signal is supplied from said analog signal output unit to said analog signal input unit as said at least one analog input signal; and an offset adjustment control circuit which supplies an output offset from said analog signal output unit to said analog signal input unit via said at least one signal path so as to detect the digital input signal inclusive of the output offset and an input offset, and cancels offsets of said analog signal output unit and said analog signal input unit on the basis of the output offset and the input offset obtained from the detected digital input signal.