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Intrinsic and extrinsic capacitances from simulation

wgtkan

Hello,

In DC simulation it is possible to save DC operating point parameters to determine extrinsic and intrinsic capacitances. For example, CGG = cgg + cgsol + cgdol + cgbol, CGB = cgb + cgbol, CDD = cdd + cgdol + cjd and for the junction or depletion capacitances such as CDB from hand calculation 

Cdb={(AD*CJ)/(1+Vdb/PB)^MJ)}+{(PD*CJsw)/(1+Vdb/PB)^MJsw)}
Cdb= Area contribution + SideWall contribution.

1. AD and PD are the Area/Perimeter of the drain junction
2. Vdb is the Drain-Bulk voltage
3. CJ, MJ, CJsw, MJsw, PB are process parameters you can get either
from your model card or from any document that is provided by your
foundry:
-> CJ=Zero-bias junction bottom capacitance density.
-> MJ=Bulk junction bottom grading coefficient.
-> CJsw=Zero-bias junction sidewall capacitance density.
-> MJsw=Bulk junction sidewall grading coefficient.
-> PB=Bulk junction built-in potential

How is it possible to obtain the value of CDB from the simulation? is it going to be CDB = cdb + cjd. And how about CDS?

Thank you so much in advance.

Parents
  • Andrew Beckett

    Which device model are you using? This will very much depend upon that...

    Andrew

  • wgtkan
    in reply to Andrew Beckett

    Hello Andrew,

    I am using PSP103.5 Model and the manual is given here:

    http://www.cea.fr/cea-tech/leti/pspsupport/Documents/psp103p5_summary.pdf

    My virtuoso version is:
    Version IC6.1.8-64b.500.9
    Spectre spectre191

    Thanks a lot.

  • Andrew Beckett
    in reply to wgtkan

    I suggest you contact customer support. I don't know the answer to your question - it's not really covered in the document you mentioned nor the device model equations that we provide. I think the operating point parameters that are output from spectre just correspond to the information in the CEA Leti document, but I'm not sure where you're getting the other calculations from (or why you really need this). 

    Andrew.

Reply
  • Andrew Beckett
    in reply to wgtkan

    I suggest you contact customer support. I don't know the answer to your question - it's not really covered in the document you mentioned nor the device model equations that we provide. I think the operating point parameters that are output from spectre just correspond to the information in the CEA Leti document, but I'm not sure where you're getting the other calculations from (or why you really need this). 

    Andrew.

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