[問題]bootstrap switch的size
我正在做1MHz 8bit 的單端saradc當練習
用在的sample and hold 的 bootstrap switch是張順志教授那篇的
一般來說 連接input和cdac top plate的那顆sampling mosfet
其size(w/l)越大 Ron越小 Sample更快 ENOB會越好
但是我的結果卻是相反:w/l=1u/0.18時 EN0B:8bit w/l=10u/0.18u時 ENOB:7.7bit
size越大 THD越大 教授要我解釋是甚麼造成這麼大的distortion 請問版上眾高手 這是甚麼原因 會是mos的cgs cgd cds 造成的distortion嗎?
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