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Nexxim Simulator >
Nexxim Component Models >
Independent Sources >
   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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