[SI-LIST] : Does IBIS describe output transition which both MOS turned on?

John Lin - TAO (LinJohn@digital.com)
Wed, 13 May 1998 10:54:34 +0800

Dear IBIS fans/SI Experts,

As I know for a CMOS device, during output transition, both PMOS and
NMOS will turn on in a short period of time. I wonder if an IBIS model
describes this behavior. If yes then how it does. Will the behavior
affect the accuracy of simulation with IBIS model?

Based on what I know the V-I curve for PULL UP or DOWN is obtained by
turning one MOS off and then swift the V-fixture to get Current reading.
It seems to me that the V_I curve doesn't contain the information to
describe the transition, both PMOS and NMOS turned on.

Any comment?

Thanks,

JOHNLIN
CAE Engineer of EDA Department
Digital Equipment Corp. Taiwan Branch
Email: Linjohn@mail.dec.com <mailto:Linjohn@mail.dec.com>
TEL: 1-886-3-3900000 ext. 2152