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Negative cbb for BSIM4 (Read 1827 times)

taik

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Negative cbb for BSIM4
Jul 01^st, 2011, 7:05am

Hi,

We are currently having problem with transient convergence on a particular circuit.

Checking with the developer reveals that certain transistors in the circuit had negative cbb which causes this convergence issue.

They are now trying to get us to confirm that this cbb parameter cannot be a negative value.

Anyone has any idea on this?

Thank you in advance.

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Geoffrey_Coram Senior Fellow Offline Posts: 1999 Massachusetts, USA	Re: Negative cbb for BSIM4 Reply #1 - Jul 8^th, 2011, 5:58am The BSIM models are known to have problems with transcapacitances like the intrinsic (channel) Cbs. I don't recall ever seeing an example where Cbb was negative; usually, I would expect the junction capacitances to dominate over the channel capacitances.
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