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How to find a point value using expression?? (Read 3450 times)

littlepig Guest	How to find a point value using expression?? Aug 19^th, 2005, 1:23am ??? Is there any possible ways to find out y-value at a particular x-value by using some expression??? (Waveform is volage vs time) Thanks...
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Jess Chen

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California Bay Area

Re: How to find a point value using expression??
Reply #1 - Aug 19^th, 2005, 8:01am

What tools are you using? Many user interfaces have waveform calculators that do the job. If you are using Spectre and do not have a GUI, you can do the job with VerilogA or SpectreHDL and probably the fairly new MDL(measurement description language?).

If all you have is raw UC Berkeley SPICE, your options will be more limited.

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Scott Flinchbaugh

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Re: How to find a point value using expression??
Reply #2 - Aug 24^th, 2005, 6:32pm

If you have access to spectremdl, construct the following
MDL file.

alias measurement foo
{
run tran( stop=<stoptime>)
export real yval = V(<signal>)@<xval>
}

run foo

------- end of file

In this measurement
<stoptime> = transient analysis stop time
<signal> = node name of interest
<xval> = time value of interest

Hope this helps.

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Andrew Beckett Senior Fellow Offline Life, don't talk to me about Life... Posts: 1742 Bracknell, UK	Re: How to find a point value using expression?? Reply #3 - Aug 27^th, 2005, 12:31am If you're using the ADE calculator (either the old one, or wavescan integrated in ADE), or OCEAN, you would use: value(v("/signal") 0.5u) for example. Regards, Andrew.
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