seahs wrote on Apr 8th, 2009, 9:56pm:I am designing a double sampling SHA(Sample and Hold Amplifier), the clock is 200MHz, which is equivalent to 400MHz in normal SHA. The signal is 40MHz.
The measured 4th, 6th, 9th and 11th harmonics are very high, which may be due to the intermoduation of clock and signal.
I read from a paper which says the those harmonics will not effect the performace and can be neglected.
Can anybody give some information why it is so?
Thanks a lot!
Please be so kind as to post some concrete information (paper reference, summary of arguments you think would make these distortion components irrelevant). Otherwise, nobody can advise you. In any case, I fail to see why large distortion in the sample-and-hold is noncritical.
Regards,
Vivek