| 摘要 |
An offset canceller outputs a signal during its offset compensating operation and compensates for the offset by capacitance or resistance devices connected externally to an operational amplifier. A driving circuit includes plural output circuits # 1 to #n+1 for outputting driving signals to plural output terminals # 1 to #n on one outputs and for outputting the driving signals on the other outputs coupled to corresponding plural output selectors # 1 to #n, which then select one of two signals output from two neighboring output circuits to transmit the selected signals to the output terminals. The output circuits # 1 to #n+1 have other outputs coupled to a decision circuit, which compares the signals to a reference voltage and outputs a decision signal representing the result of comparison at a predetermined timing. The output circuits execute the offset cancel operation responsive to the decision signal. |
