| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an operational amplifier circuit that can produce a variety of output voltage levels, reduce an output offset voltage incident to manufacturing variations, and provide reduction accuracy of the output offset voltage without depending on an input voltage. <P>SOLUTION: A switch group is provided to switch between a first circuit state and a second circuit state. N input differential pairs are provided so that n+1 levels of output voltage can be generated. In the first circuit state, a pair of input voltage groups are supplied to each of input differential pairs to hold the output offset voltage on a capacitor through a current mirror circuit. In the second circuit state, the output offset voltage is cancelled using the voltage held on the capacitor. <P>COPYRIGHT: (C)2012,JPO&INPIT |
