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hi
maybe your means how to calculate the thd of a CMOS switch ,right?
u can do a fft simulation,
u can also refer the hspice manual or help for details..
regards.
you need to do DFT and look at the difference between fundamental and the nearest bin. Note that the key in getting proper distortion number is to perform dft properly.
you need to set Fin = (n/N) fs
where n is a prime number and N is number of points of DFT e.g. 1024 (2^b).
This relation is very critical to avoid odd higher frequency harmonics from aliasing back to the band of interest.
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