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".sample" commend for noise folding analysis wi hs

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sethtalk

sethtalk

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hi, dear all:
i do noise analysis for fully OTA with cap. feedback,
because the output signal/noise is sampled at freq=30MHz,
i write the commend in hspice code:

.nose v(outp,outn) vd 1
.ac dec 100 1 300Mhz
.sample fs=30x

the summary about noise power shows that the total output noise power is 53uV-rms,but the total output sampled noise power is zero,

why the .sample commend is not work ?
 

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