Type Name: c
The capacitor model contains process information that may be used to compute the capacitance from strictly geometric information.
Capacitor Model Parameters name parameter units default example cj junction bottom capacitance F/M^{2} - 5e-5 cjsw junction sidewall capacitance F/M - 2e-11 defw default device width M 1e-6 2e-6 narrow narrowing due to side etching M 0.0 1e-7 tnom parameter measurement temperature C 25 50 tc1 first order temperature coeff. /C 0.0 - tc2 second order temperature coeff. /C^{2} 0.0 -
The capacitor has a nominal capacitance computed as below, where l and w are parameters from the device line.
C = cj^{ . } (l- narrow)(w- narrow) + 2cjsw^{ . } (l+ w- 2^{ . } narrow)
After the nominal capacitance is calculated, it is adjusted for temperature by the formula:
C(temp) = C(tnom)^{ . } (1 + tc1^{ . } (temp- tnom) + tc2^{ . } (temp- tnom)^{2} )