| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a correlated double sampling circuit extracting a signal component with a high S/N ratio by achieving a low noise characteristic without causing an increase in a circuit scale and power consumption. Ž<P>SOLUTION: A first switch S1 and a hold capacitor Ch are connected in series between an inverted input terminal of an operational amplifier A1 and an output terminal of the operational amplifier A1. Then, the hold capacitor Ch is made to hold only electric charge of a phase 2 by turning off the first switch S1 in a phase 1 (first sampling period), and turning on the first switch S1 in the phase 2 (second sampling period). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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