LMETERR - Inductance Meter (Differential IO)

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Model Kind

General

Model Sub-Kind

Generic Editor

SPICE Prefix

A

Model Name

LMETER

SPICE Netlist Template Format

@DESIGNATOR %%vd(%1,%2) %%vd(%3,%4) @"DESIGNATOR"LMETER
.MODEL @"DESIGNATOR"LMETER lmeter (?gain|gain=@gain|)

Parameters (definable at component level)

The following component-level parameters are definable for this model type and are listed on the Parameters tab of the Sim Model dialog. To access this dialog, simply double-click on the entry for the simulation model link in the Models region of the Component Properties dialog.

Gain

gain (default = 1).

Notes

This is a sensing device which is attached to a node in the circuit and produces as an output, a scaled value equal to the total inductance seen on its input, multiplied by the value assigned to the Gain parameter. This model is useful as a building block for other models, which require to sense an inductance value and adjust their behavior with respect to it.

The input signal can be either a differential current or differential voltage signal.

Examples

Consider the inductance meter in the above image, with the following characteristics:

  • Pin1 (positive input) is connected to net In1
  • Pin2 (negative input) is connected to net In2
  • Pin3 (positive output) is connected to net Out
  • Pin4 (negative output) is connected to net GND
  • Designator is U1
  • Gain = 25

The entry in the SPICE netlist would be:

*Schematic Netlist:
AU1 %vd(IN1,IN2) %vd(OUT,0) AU1LMETER
.MODEL AU1LMETER lmeter (gain=25)

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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