OFFSET CORRECTION APPARATUS, SEMICONDUCTOR DEVICE AND DISPLAY DEVICE AND OFFSET CORRECTING METHOD, NOISE DETECTOR, AND NOISE DETECTING METHOD

摘要

PPROBLEM TO BE SOLVED: To accomplish an offset correction apparatus which is capable of performing offset correction, without requiring frequent refresh, while absorbing offset variation in small circuit scale. PSOLUTION: In an operational amplifier circuit 1, a switch element S1 is closed and a switch element S2 is opened. A latch circuit DL latches an output voltage of an operational amplifier 1a and performs Q outputting corresponding thereto, and a control circuit 2a inputs a signal s1 for offset correction to an offset control input terminal OR of the operational amplifier 1a. An output voltage thus offset-corrected is further latched by the latch circuit DL and the signal s1 for offset correction is to be precisely controlled for correcting remaining offset. Thus, the offset of the output voltage of the operational amplifier 1a is quantized while being weighted in accordance with the number of times of the latched output voltage at that time, and is stored within the control circuit 2a as a binary logic signal. PCOPYRIGHT: (C)2008,JPO&INPIT