| 摘要 |
A comparator using an operational amplifier, includes an input switching circuit for passing an input signal in a first state, wherein a comparison is effected and for stopping the input signal in a second state wherein an input offset voltage is cancelled. An output switching circuit holds an output signal in the first state and outputs a held output signal in the second state of the input switching circuit. An input/output switching signal generation circuit generates control signals to switch between the first state and the second states; and a first comparator outputs resultant comparison data in the first state and cancels the input offset voltage in the second state.
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