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https://designers-guide.org/forum/YaBB.pl Design >> Analog Design >> node capacitance https://designers-guide.org/forum/YaBB.pl?num=1077279932 Message started by boa on Feb 20th, 2004, 4:25am |
Title: node capacitance Post by boa on Feb 20th, 2004, 4:25am I want to estimate non-dominant poles in folded-cascode OTA (circuit design, no layout parasitics yet). How can I estimate the capacitance of a node from Spectre simulation? Operational point simulation in Spectre gives 18 capacitances: 16 transcapacitances Cij = dQi/dVi, where i, j = D, G, S, B and cjd, cjs capacitances (source- and drain-bulk capacitances) (ASFAIK, these capacitances come from BSIM3v3 model). I would like to deal with terminal capacitances, i.e. Cgd, Cgs, Cdb, Csb. How can I get them (or maybe an overall node capacitance??) |
Title: Re: node capacitance Post by Andrew Beckett on Mar 4th, 2004, 9:24am Spectre can output a capacitance table with the captab option on the info analysis (spectre -h info). This can be done from the analog design environment too (if I remember rightly, it's an option on the DC analysis options form). As for representing the partial derivatives in a more useful form, here's a note I wrote a few years ago on this: Quote:
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