Exponential
General Form:
EXP(V1 V2 TD1 TAU1 TD2 TAU2)
Examples:
VIN 3 0 EXP(-4 -1 2NS 30NS 60NS 40NS)
Name
|
Parameter
|
Default Value
|
Units
|
V1
|
Initial value
|
-
|
V, A
|
V2
|
pulsed value
|
-
|
V, A
|
TD1
|
rise delay time
|
0.0
|
sec
|
TAU1
|
rise time constant
|
TSTEP
|
sec
|
TD2
|
fall delay time
|
TD1+TSTEP
|
sec
|
TAU2
|
fall time constant
|
TSTEP
|
sec
|
The shape of the waveform is described by the following formula:
Let (V21 = V2 - V1, V12 = V1 - V2):
[\begin{array}{ll} {V\left( t \right) = \begin{cases} {V1} & {{if} 0 \leq t < TD1,} \ {V1 + V21\left( {1 - e^{- \frac{({t - TD1})}{TAU1}}} \right)} & {{if} TD1 \leq t < TD2,} \ {V1 + V21\left( {1 - e^{- \frac{({t - TD1})}{TAU1}}} \right) + V12\left( {1 - e^{- \frac{({t - TD2})}{TAU2}}} \right)} & {{if} TD2 \leq t < TSTOP.} \ \end{cases}} & \ \end{array}]