Version 4
SHEET 1 2084 1624
WIRE 128 240 128 336
WIRE -64 224 16 224
WIRE -64 304 -64 336
WIRE -64 176 -64 160
WIRE -64 80 -64 48
WIRE -64 48 128 48
WIRE 128 128 128 144
WIRE 288 144 128 144
WIRE 16 224 80 224
FLAG 128 336 0
FLAG -64 336 0
FLAG -64 176 0
FLAG 288 144 out
IOPIN 288 144 Out
FLAG 16 224 gate
SYMBOL voltage -64 208 R0
WINDOW 3 -68 169 Left 0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR Value PULSE(1 2 1m 5m 5m 1m 13 1)
SYMATTR InstName V1
SYMBOL Sources\\voltage -64 64 R0
WINDOW 123 0 0 Left 0
WINDOW 39 0 0 Left 0
SYMATTR InstName V2
SYMATTR Value 12
SYMBOL res 112 32 R0
SYMATTR InstName R1
SYMATTR Value 1k
SYMBOL Z:\\Jims\ circuits\\Monte\ carlo\ toolbox\\xnmos_mc 80 144 R0
SYMATTR InstName U1
SYMATTR SpiceModel ZVN2106A
SYMATTR SpiceLine tol=10 seed=1
TEXT -50 -22 Left 0 !.tran 13m
TEXT -56 -56 Left 0 !.step param run 0 2 1
TEXT 640 -48 Left 0 ;Helmuts binary min max model and a mean of 5 gaussian \nmodel are contained in the montecarlo symbol spice line 1 & 2\nSpice line 1: tol =1 seed=1\nSpice line 2- minmax model:\n EPS=1e-6 TOLC=TOL/50 w=2**(seed-1)\n+RN=if(((run-1)-(2*w)*int((run-1)/(2*w)+EPS))>(w-0.5),1,0)\n+minmax=if((run==0),1,1-TOLC/2+TOLC*RN)\n Spice line 2- gaussian model: \n +A1=(1+TOLC*(rand(seed*100000+run)-.5)) \n+A2=(1+TOLC*(rand(seed*100000+10000+run)-.5)) \n+A3=(1+TOLC*(rand(seed*100000+20000+run)-.5)) \n+A4=(1+TOLC*(rand(seed*100000+30000+run)-.5)) \n+A5=(1+TOLC*(rand(seed*100000+40000+run)-.5)) \n+gaussian=(a1+a2+a2+a4+a5)/5\n \nHints:\nSet tolerance for each subcircuit as required.\nSet unique seed value for each of N componants.\nSeed= 1....N in integer steps.\nCopy subcircuit definition to the schematic.\napply tolerance modifiers minmax or gaussian to\nsubcircuit model parameter as required.\nAlternatively the modified subcircuits could be in a seperate\ntext file, with an appropriate include directive on the schematic.
TEXT -128 432 Left 0 !*ZETEX  ZVN2106A Spice model    Last revision   6/4/01\n*\n*NOTE: If required increase ABSTOL to resolve convergence problems.\n*\n.SUBCKT ZVN2106A 3 4 5\n*------connections-------D-G-S\nM1 6 2 8 8 N2106AM\nM2 6 2 8 8 N2106AMS\nRG 4 2 15\nRD 3 6 0.25\nRS 8 5 0.94 \nRL 3 5 100E6\nC1 2 8 37E-12\nC2 2 3  20E-12\nC3 15 14 85E-12 \nC4 16 8 87E-12\nD1 5 3 N2106AD\nS1 2 15 13 14 SMOD1\nS2 13 15 14 13 SMOD1\nS3 16 13 13 8 SMOD2\nS4 16 2 8 13 SMOD2\nEgs2 13 8 2 8 1\nEds1 14 8 3 8 1\n*.MODEL N2106AM NMOS VTO={1.6*gaussian} IS=1E-15 KP=0.67\n.MODEL N2106AM NMOS VTO={1.6*minmax} IS=1E-15 KP=0.67\n+CBD=50E-12 PB=1\n*.MODEL N2106AMS NMOS VTO={.98*gaussian} IS=1E-15 KP=0.006 PB=1\n.MODEL N2106AMS NMOS VTO={.98*minmax} IS=1E-15 KP=0.006 PB=1\n.MODEL N2106AD D IS=5.516E-13 RS=.2084 N=1.0078\n.MODEL SMOD1 VSWITCH RON=.001 ROFF=100  VON=3.5 VOFF=2.5\n.MODEL SMOD2 VSWITCH RON=.001 ROFF=100  VON=-5 VOFF=-6\n.ENDS ZVN2106A\n*
TEXT 480 1040 Left 0 ;Model parameter Vto has a 10% tolerance applied by parameter minmax / gaussian
TEXT 552 1120 Left 0 ;Model parameter Vto has a 10% tolerance applied by parameter minmax / gaussian