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The Designer's Guide Community Forum › Modeling › Semiconductor Devices › Gummel symmetry in BSIM3/BSIM4 MOSFET model
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Gummel symmetry in BSIM3/BSIM4 MOSFET model (Read 3423 times)
337see733
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Gummel symmetry in BSIM3/BSIM4 MOSFET model
May 20th, 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.
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Geoffrey_Coram
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Re: Gummel symmetry in BSIM3/BSIM4 MOSFET model
Reply #1 - May 24th, 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.
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337see733
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Re: Gummel symmetry in BSIM3/BSIM4 MOSFET model
Reply #2 - May 24th, 2006, 6:17pm  
THanks.
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