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Modeling a frequency dependent Inductor in PSpice

DesignTech

You can now model a frequency-dependent inductor in PSpice in three simple steps: 

  1. Extract data from the manufacturer datasheet. 
  1. Convert the data into a csv file. 
  1. Simulate in PSpice by using AC analysis. 

To model the inductance, you will use the GFREQ_FILE component, which supports entries from a CSV file. This component has the following format as entries in a CSV file. 

Frequency, Magnitude, Phase 

You can extract the frequency vs. inductance data from the graph provided in the inductor’s datasheet and the magnitude can be calculated using the following formula:  

1/(2*pi*f*L) 

Phase for inductance is 90 degrees. Following are the CSV table entries with the magnitude derived using this equation. Save the CSV file on the disk. 

Frequency  

Magnitude  

Phase  

10k  

0.04681028  

90  

100k  

0.004822877  

90  

500k  

0.000979415  

90  

600k  

0.000808714  

90  

700k  

0.000688982  

90  

800k  

0.000598327  

90  

900k  

0.000527877  

90  

1meg  

0.000468103  

90  

1.5meg  

0.000294731  

90  

2meg  

0.000204045  

90  

2.5meg  

0.000148051  

90  

3meg  

0.000108269  

90  

3.5meg  

0.0000798  

90  

 

Select the GFREQ_FILE component and open its properties to enter the location of your csv file against the FREQ_FILE property as shown below: 

Create a circuit and using AC sweep analysis, you can plot the behavior.

Team DesignTech

Cadence Design Systems

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