vivkr
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Hi,
I would recommend using the strobe feature of transient analysis to begin with. This guarantees that the simulator places a timestep at the point where you want to observe the sampled output. Without this, you are likely to get very bad results. After this, you can use the inbuilt "dft" function of the calculator.
However, this feature which used to work well earlier seems to give me some trouble nowadays. So, I print out the output values into a text file at the strobed points, and perform an FFT with any convenient tool - MATLAB, Excel etc. Normally though, the calculator should do a good job if you have properly strobed the output at the right point.
Regards Vivek
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