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Help about �.pnoise in SpcetreRF (Read 2200 times)

xiaodu2001

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Help about �.pnoise in SpcetreRF
Nov 13^th, 2008, 6:08pm

In "Simulating Switched-Capacitor Filters with SpectreRF"(http://www.designers-guide.org/Analysis/sc-filters.pdf) Listing 1:

unsmpldNoise (out 0) pnoise start=0_Hz stop=10/TCLK maxsideband=100
smpldNoise (out 0) pnoise start=0_Hz stop=0.5/TCLK maxsideband=100 \
noisetype=timedomain noisetimepoints=[0] \
numberofpoints=1

Differente parameters bettween "unsmpldNoise" and �"smpldNoise" �is "stop", and so the power spectral density of the 2 pnoise analyse is greatly different.
my question is :
what does parameter "stop" mean in .pnoise analysis and how can i explain the phenomena occured above?

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Frank Wiedmann Community Fellow Offline Posts: 678 Munich, Germany	Re: Help about �.pnoise in SpcetreRF Reply #1 - Nov 13^th, 2008, 11:46pm In sampled (or strobed, or timedomain) pnoise analysis, all the noise is aliased into the frequency range between 0 and half the "Beat Frequency" of the associated pss analysis (see figure 3 of the paper). The parameters start and stop specify the frequency range for the analysis.
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xiaodu2001 New Member Offline Posts: 5	Re: Help about �.pnoise in SpcetreRF Reply #2 - Nov 14^th, 2008, 2:57am Hello Frank: Thanks for your advise. best wishes!
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