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Does anybody know why some ngspice sims of `nfet_01v8` return negative junction capacitances?
# analog-design
r
Does anybody know why some ngspice sims of 
nfet_01v8
return negative junction capacitances?
s
see section 31.6.9 of the ngspice manual: "_Negative capacitance values may occur, depending on the internal calculation. To compare_ with measured data, please just use the absolute values of the capacitance data. For an explanation of negative values and the basics on how capacitance values are evaluated in a BSIM model, please refer to the book BSIM4 and MOSFET Modeling for IC Simulation _by Liu and Hu, Chapt. 5.2_".
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