| 摘要 |
PROBLEM TO BE SOLVED: To keep the offset voltage of an analog video signal prior to A/D conversion, particularly for maintaining constant concerning video camera signal processing for executing signal processing after making the analog signal output of a solid-state image pickup element a digital signal, using an A/D converter. SOLUTION: A capacitor for performing charging and discharging and a bias capacitor for deciding offset are separated to be independent and they alternately operate in time-division manner for each line, thereby a stable video signal free of the influence by the charging and discharging of a clamp capacitor can be obtained within one line period to realize precise clamping operation.
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