How to character s/h system performance

[vincent]

Hi, there:


I'm designning a switched capacitor ADC now. the first task is a high
performance s/h (for 12 bit ADC).

My question is how to charcter s/h performance. I kow the THD is very
important. but how can I get it? Transient analysis is a straight forward
way. but it's very time consumable. I guess PSS or QPSS could help me, but
their result are very different with transient's even big difference
between themself.



Thanks a lot


Vincent