Andrew Beckett
Senior Fellow
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Life, don't talk to me about Life...
Posts: 1742
Bracknell, UK
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Do you have access to SpectreRF? That would be a much better bet for simulating the noise in an SC filter. Transient noise analyses (and spectre can do this as well, since MMSIM60) suffer from the problems you've described if you want to make any kind of quantative measurement - you need to set the maximum frequency to something sensible (which results in rather short timesteps) and you need to simulate for a long time to get the averaging and to include flicker noise properly. So it's best for qualitative measurements (in my opinion) (i.e. did the change I made in my circuit improve things or make things worse) - and it's best to use something else (like pnoise, or tdnoise) if you can (i.e. if the circuit is periodic in nature, and the noise can be treated as small signal).
Regards,
Andrew.
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