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Voltage Source, Exponential (Netlist Only)

Voltage Source, Exponential (Netlist Only)

Exponential Voltage Source Netlist Format

The format for specifying an exponential current source is:

Vxxxx n+ n- EXP (v1 v2 [td1 [td2 [t1 [t2]]]])

n+ is the positive node and n- is the negative node of the voltage source. Parameters in parentheses are positional. The first two (v1 and v2) are required. The remainder (td1, td2, t1, and t2) can be omitted, but the parameters must be entered in the order given. To guarantee that a given parameter is interpreted correctly, all parameters to the left of it must be present.

Note

The exponential voltage source is available for use in netlists, but is not supported in the Components window of the Designer Schematic Editor.

**Exponential Voltage Source Parameters**
Parameter	Description	Unit	Default
v1	Initial voltage value	Volt	0.0
v2	Maximum voltage value	Volt	0.0
td1	(Positive) delay time to start of exponential rise	Second	0.0
td2	Delay time to start of exponential fall	Second	td1+TSTEP (step argument from the TRAN statement
t1	Rise time constant	Second	TSTEP
t2	Fall time constant	Second	TSTEP

Exponential Voltage Source Netlist Example

.TITLE VEXP TEST

V1 1 0 EXP(-4 -1 5ns 30ns 80ns 40ns)

R1 1 0 1

.TRAN 0.5ns 200ns

.PRINT V(1)

.END

Notes

1. The td2, t1, and t2 parameters take their default values from the step argument on the transient analysis TRAN statement (see Transient Analysis Netlist Format). Therefore, when a circuit containing an exponential voltage source is to be analyzed with a tool other than transient analysis, the td2, t1, and t2 parameters must be given explicit values.

2. The exponential voltage source exhibits an 'overshoot' when the first time period is small relative to the first decay constant.

3. Exponential Voltage Source Equations:

From time = 0 to time = td1:

Output = v1

From time=td1 to time = td2:

Output = v1 + (v2 - v1) ´ (1.0 - EXP[-(time - td1) / t1]

From time = td2 to time = tstop:

Output = v1 + (v2-v1) ´ (1.0 - EXP[-(time-td1) / t1] ) - (v2 - v1)´ (1.0 - EXP[-(time-td2) / t2] )

4. Here is the resulting waveform:

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