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 Generating a random signal in Virtuoso 

Last post Mon, Dec 17 2012 3:25 AM by Andrew Beckett. 1 replies.
Started by Donatello 06 Dec 2012 02:02 PM. Topic has 1 replies.
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  • Thu, Dec 6 2012 2:02 PM

    • Donatello
    • Top 500 Contributor
    • Joined on Thu, Dec 6 2012
    • Posts 14
    • Points 175
    Generating a random signal in Virtuoso Reply

     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.

    • Post Points: 20

  • Mon, Dec 17 2012 3:25 AM

    Re: Generating a random signal in Virtuoso Reply

    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.

    • Post Points: 5
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Started by Donatello at 06 Dec 2012 02:02 PM. Topic has 1 replies.