Simulation: SPICE Update 1

I haven't had much to say these past few days...nothing really new.  I finally came up with a structure for my software.  I will have separate models (including companion models) for every device except for the basics: resistor, independent voltage, current sources, and dependent voltage, current sources.  After this everything else is modeled.  So I have a format for my "netlist"

I'm not using the classical netlist format.  I will have to be able to import classic netlists into the software but I haven't gotten that far yet.  Hopefully this will come sooner than later.  Anyways, sorry this isn't more detail oriented.

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Justin Coulston
justin.coulston@gmail.com

Simulation: Netlist Template

I have spent the last 2 days trying to figure out how to generalize the process of subcircuits for the SPICE software.  I've gone through a few design possibilities and finally came to the conclusion that simple netlist style templates will work perfectly.

So instead of reinventing the wheel, I'll use the classic technique of netlisting.  I will end up using a different netlist for different simulation types.

Example:
The capacitor companion model for a ...

Transient Analysis: Consists of a resistor in parallel with a current source.
DC Analysis: Consists of either a perfect open or very high value resistor (> 1 Gigaohm)
Small Signal or AC Analysis: Consists of a resistor with equation R = 1/(2*pi*f*C)

So I'll have different models for different simulation types as you can see.  The biggest question will be how to define the equations for the individual parameters.  How should I implement these into classes inside the program?  Creating text file models is the easy task.  It's a little more difficult to implement into Classes.

That's the extent of where I am currently.

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Justin Coulston
justin.coulston@gmail.com