Trouble with 3-terminal MOSFets and the bulk node connection

C

Cliff Curry

Guest
Using the spectre simulator,
I can't seem to get the bulk node connection of my pmos and nmos 3-termninal
parts to be anything but ground. This is ok for the n-mos, but certainly
not for the pmos!

When I change the CDF parameter "bn" to vdd! (or in fact, anything at all),
it makes no difference. The netlist still comes out with the bulk node
written as "0". It seems that the netlister ignores this CDF parameter and
always writes a zero.

Of course, 4 terminal FETS are OK, I can explictly wire the bulk to
wherever.

Has anyone seen something like this before?

Thanks,

Cliff Curry
 

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