The start and stop time of FFT command in Hspice

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FFT command in Hspice

I want to know the meaning of start and stop time in FFT command

example

#######################################

.FFT V(Vout) start =1u stop = 2u np =1024 format=norm FREQ=2G dc=off
.tran 1p 10u

#######################################

why we should 1u start time and 2u stop time?

How do I determine transient stop time?

I want somone who explain intuitively in detail

thanks
 

Re: FFT command in Hspice

when you do fft, the time need has to be the number of signal period. Hope you understand now
 

FFT command in Hspice

hi
you must select in manner start and end of time that Tstop-Tstart=Period
regards
 

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