Star-Hspice Quick Reference Guide

LEVEL 47 BSIM3 Version 2 MOS Model
• The default room temperature is 25°C in Star-Hspice, but
27°C in SPICE3; if BSIM3 model parameters are specified
at 27°C, use TREF=27.
• The default of DERIV is zero (analytical method); if set to 1
(finite difference method), it gives more accurate derivatives
but consumes more CPU time.
• Three ways for the BSIM3 model to calculate V th :
- User-specified K1 and K2 values.
- GAMMA1, GAMMA2, VBM, and VBX values entered in
the .MODEL statement.
- User-specified NPEAK, NSUB, XT, and VBM values.
• NPEAK and U0 can be in meters or centimeters. You must
enter the parameter NSUB in cm -3 units.
• VTH0 for P-channel in the .MODEL statement is negative.
• The default value of KT1 is -0.11.
• LITL may not go below a minimum value of 1.0e-9 m.
• VSAT, after temperature adjustment, is not allowed to go
below a minimum value of 1.0e4 m/sec, to assure that it is
positive after temperature compensation.
• The model parameters that accommodate temperature
dependencies are KT1 and KT2 for VTH, UTE for U0, AT for
VSAT, UA1 for UA, UB1 for UB, and UC1 for UC.
Star-Hspice Quick Reference Guide 10-7