LNI - Natural Logarithm of Current

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Model Kind

General

Model Sub-Kind

Spice Subcircuit

SPICE Prefix

X

Model Name

LNI

SPICE Netlist Template Format

@DESIGNATOR %1 %2 %3 %4 @MODEL

Parameters (definable at component level)

None

Notes

The content of the sub-circuit file (LNI.ckt) associated with this model is shown below. The formula/equation used to provide this function is declared as part of the netlist-specific entry, under the .SUBCKT line of the file.

*Natural logarithm of Current
.SUBCKT LNI 1 2 3 4
VX 1 2 0
BX 4 3 I=LN(I(VX))
.ENDS LNI

Examples

Consider the circuit in the image above. With respect to the LOGI component, the entries in the SPICE netlist will be:

*Schematic Netlist:
XM1 IN 0 OUT 0 LNI 
.
.
*Models and Subcircuit:
.SUBCKT LNI 1 2 3 4
VX 1 2 0
BX 4 3 I=LN(I(VX))
.ENDS LNI

The effect of the function can be seen in the resultant waveforms obtained by running a transient analysis of the circuit.

In this example, the following analysis parameters on the Transient/Fourier Analysis page of the Analyses Setup dialog have been used:

  • Transient Start Time - set to 0.000
  • Transient Stop Time - set to 50.00m
  • Transient Step Time - set to 200.0u
  • Transient Max Step Time - set to 200.0u
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