Esther wrote on Dec 13th, 2006, 5:37pm:Thank you Jerry for your sharing.
Yawei
The reason I split clock period to chargeing period and bootstrapping period is that I care about the bootstrapping period is too short and not enough for opamp to pull the node voltage level to Vctrl before next chargeing switch turns on. I mean when clock ref and clock feedback have a almost 180 phase difference, the charging period is long but bootstrapping period is very short.
Thanks.
Esther
hi,
i don't think it is necessary to introduce a bootstrapping period.
first, i think, it will take a long time for the output of the op to follow the Vctrl, and not a transient process. so you need not a high bandwidth OP.
second, the added period, i think, will induce bad spur performance.
good luck
jeff