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.