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Modeling >> Semiconductor Devices >> Gummel symmetry in BSIM3/BSIM4 MOSFET model
https://designers-guide.org/forum/YaBB.pl?num=1148136235

Message started by 337see733 on May 20^th, 2006, 7:43am

Title: Gummel symmetry in BSIM3/BSIM4 MOSFET model
Post by 337see733 on May 20^th, 2006, 7:43am

Dear all,

I have come across some old( or new?) slides concerning this issue by BSIM4.
Is it right to say that BSIM3/BSIM4 still having this problem? Thanks.

Title: Re: Gummel symmetry in BSIM3/BSIM4 MOSFET model
Post by Geoffrey_Coram on May 24^th, 2006, 4:24am

Yes, BSIM3 and BSIM4 still have these problems.

The BSIM team found a way to fix (patch?) the current (id_chan) equation so that it has the right symmetries of derivatives at Vds=0.
However, the charge model is significantly harder to fix, so the capacitances are quite asymmetrical.

Title: Re: Gummel symmetry in BSIM3/BSIM4 MOSFET model
Post by 337see733 on May 24^th, 2006, 6:17pm

THanks.