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ランプ生成回路及び固体撮像装置
专利权人:
パナソニックIPマネジメント株式会社
发明人:
樋口 真浩,藤中 洋,生熊 誠
申请号:
JP20140518268
公开号:
JP6128493(B2)
申请日:
2013.05.23
申请国别(地区):
日本
年份:
2017
代理人:
摘要:
A ramp generator circuit includes: a reference signal generator circuit which generates a ramp waveform having a slope obtained by multiplication using a power of 2 according to a value of a higher order bit of a gain control signal; a clock control circuit which selectively outputs 2^m kinds of fractional-N clocks according to one of 2^m (natural number) areas obtained by dividing a code range represented by a lower order bit, when a negative gain is set; and a variable gain circuit which sets a ramp waveform according to the value of the gain control signal, and sets a ramp signal amplitude in each area so that a period ratio between ramp driving clocks for adjacent areas and a ratio between an amplitude of a ramp signal when the standard gain is set and a largest amplitude of a ramp signal are equal.
来源网站:
中国工程科技知识中心
来源网址:
http://www.ckcest.cn/home/

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