VBIC Model History Notes Release 1.2, Sep 18, 1999 1.2 updates: Sep 24, 1999 3-terminal version defined base-emitter breakdown model added reach-through model added for B-C depletion capacitance homotopy version of code added limited exponential version added Completely new code generation added C, FORTRAN, Verilog-A, Perl, and MAST code provided Bug in psibi mapping with temperature fixed Bugs in electrothermal derivatives and solver stamp fixed DTEMP local temperature difference parameter added VERS and VREV (version revision) parameters added NKF high current beta rolloff parameter added Temperature dependence added to IKF Ability to select SGP qb formulation added (QBM) Ability to separate IS for fwd and rev added (ISRR) Fixed collector-substrate capacitance added (CCSO) Separate temperature coeffs added for RCX, RBX, RBP tl node eliminated POLARITY OF SOME BRANCHES REVERSED FOR VERILOG-A COMPATIBILITY > Ith flows from dt to ground and so is negative > Ixzf flows from xf1 to ground as so is negative of Itzf Igc component moved into Ibc Icc broken into forward and reverse components, Itxf or Itzf and Itzr 1.1.5 updates: Jul 28, 1996 Dependence of Irbp on Vbci added to "branch currents" Itf/Itr renamed Itfi/Itri to avoid name conflicts Resistor collapse and code bypass condition changed from par==0 to par<=0 Branch current and charge dependencies separated for self-heating and no self-heating Depletion charge and avalanche routines that provide derivatives for self-heating added Self-heating solver and examples added (HBT) Extra external node added for self-heating to allow coupling of thermal models between devices 1.1.4 updates: Qbe diffusion term made equivalent to SGP (divide by qb) Solver example including excess phase added (Icc separated into Itzf|Itxf and Itzr for this) Error in sgp_to_vbic in PTF to TD translation fixed 1.1.3 updates: Ith bug fixed and Igc term added BFN exponent added to 1/f noise RTH default changed to zero parameter aliases added 1.1.2 updates: EAI bug fixed in PE/PC/PStemperature mapping single->double precision in decomp/solve/vbict/QCDEPL scale changed to vscale in solver to avoid name conflict avalanche model added, element Igc initialization changed in solver AC solver and AC and temperature tests added missing term in derf_Vrci added potential numerical problem in Irci fixed 1.1.1 updates: VJ->V bug fixed in qj definition potential numerical problems with ITF fixed typo derf_Vcci fixed to derf_Vrci in FORTRAN code