025_modif_sim : Stability analysis
Requires: SmartSpice & Smartview
Minimum Versions: SMARTSPICE 3.16.12.R
- .Modif parameter variation
The .MODIF can be used to change a parameter value and hence run a number of simulation changes to see the circuit response. In this simple descrete device inverter circuit we use a couple of MODIF loops to show how this commnad can be cascaded (2 levels here) to perform 2 steps of 6 itterations each to give 12 transient simulation runs.
The key statement in the input deck is: .MODIF proff prtbl m2(w)=32.6u LOOP=6 vccDC+=(4.5)0.1v +MODIF proff prtbl TEMP=75 LOOP=6 vccDC+=(4.5)0.1v
This statement can be used in many ways. For more information see chapter 3 of SmartSpice Users manual.
Input Files
mod1.in
* Parametric analysis - Inverter ********************************** vcc vss 0 DC vccDC vin inp 0 PULSE(0 3 0 trtf trtf 10ns 40ns) m1 2 inp vss vss pm w=wp l=1.6u m2 2 inp 0 0 nm w=30u l=2.0u cout 2 0 50ff .MODEL pm PMOS ( level=3 tox=.02e-6 + phi=0.576 gamma=0 vto=0 alpha=0 kappa=0) .model nm NMOS ( level=3 tox=.02e-6 + phi=0.576 gamma=0 vto=0 alpha=0 kappa=0) ***** Analysis statement .TRAN 0.1ns 25ns ***** Measure statements .MEASURE TRAN delrise DELAY v(inp) RISE=1 VAL=1.5 + TARG=v(2) FALL=1 VAL='0.5*vccDC' .MEASURE TRAN maxv2 MAX v(2) .MEASURE TRAN delfall DELAY v(inp) FALL=1 VAL=1.5 + TARG=v(2) RISE=1 VAL='0.5*maxv2' ***** Parameter labels .PARAM vccDC= 5V wp=4.9u trtf=1ns ***** Parametric analysis specification .MODIF proff prtbl m2(w)=32.6u LOOP=6 vccDC+=(4.5)0.1v +MODIF proff prtbl TEMP=75 LOOP=6 vccDC+=(4.5)0.1v .options nomod .END
025_modif_sim
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