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Difference between cds and cdsbo(or cgs & cgsbo) in DC Operating Point

The DC Operating Point of a NMOS is shown below. I want to know the parasitic capacitance of the NMOS. But there are cgs, cgsbo, cds and cdsbo. cds equals cdsbo while cgs does not equal to cgsbo. So what is the difference between parasitic capacitance with suffix "bo" and without it. I don't quite understand.

Look forward to your reply.

Andrew Beckett over 3 years ago

Assuming this is a bsim4 transistor, see "spectre -h bsim4" (and also the Spectre Model documentation). It explains the difference.

Andrew
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