> I would guess, the main harmonic of the clock, as it is at this
frequency that you will get the most amplitude loss.
How about the whole range of frequencies over which you have significant
signals reaching this IC?
If you choose any one frequency, your results will only be good for that
frequency as a narrowband solution. If your circuit is wideband or
digital, the narrowband analysis won't do.
Regards,
Andy
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