ngspice/examples/xspice/see/set1.cir

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SET pulse test
.param alpha = 100p beta = 500p deltat = 1n
* Arbitrary currnt source with expression
Bset1 1 0 I = ternary_fcn(TIME < 'deltat', 0, 2.5m * (exp(-(TIME-'deltat')/'alpha')-exp(-(TIME-'deltat')/'beta')))
R1 1 11 1
Vmeas 11 0 0
* Eponential current source
Iset 2 0 EXP(0 -2.5m 'deltat' 'alpha' 'deltat' 'beta')
R2 2 22 1
Vmeas2 22 0 0
.control
tran 1p 10n
set xbrushwidth=2
plot I(Vmeas)-I(Vmeas2)
plot I(Vmeas) I(Vmeas2)
.endc
.end