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Generating a random signal in Virtuoso

Donatello

 Hello Everyone,

I am designing a circuit which needs to take a random signal and then work on it. For now, i need to know how to generate a signal, that looks like the picture on this link:

http://hyperphysics.phy-astr.gsu.edu/hbase/biology/actpot.html

I have tried using vpulse, but it only gives me options to manage voltage 1 and voltage 2. How can i change the rise and fall times of voltage 1 and 2, and perhaps the damping factor, to make it look like the above mentioned image of an action potential?

I have tried using vpwl, but to no avail.

 

Your help would be appreciated.

 

Thanks.

  • Andrew Beckett

    You might be able to roughly model the first peak with a pulse source using the edgetype set to halfsine, but it wouldn't be terribly accurate. Better would be to do some sort of curve fit, and then either use a polynomial controlled voltage source (pvcvs) with the appropriate coefficients, or write a Verilog-A model to describe the curve as a function of time. The link you gave just gave pictures, but hopefully you have some more concrete data from somewhere.

    You could also use vpwl if you had a source file with sufficient data in it.

    Regards,

    Andrew.

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