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Impulse Response

Question asked by ewadmin on Mar 3, 2003
Latest reply on Mar 15, 2003 by MZachmann

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It would be nice to have a software feature to allow you to plot the impulse response of linear system in Genesys. I realize that this can be done externally in a math software package. Having it as part of Genesys would be very nice. Are there any plans to incorporate this?

[Originally posted in old forum by Doug Fitzpatrick at dfitzpatrick@timedomain.com]

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ewadmin Mar 5, 2003 9:38 AM
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A time domain response can be given now. Simply put any time domain port (inp_vpulse, for example) for the input, then run HARBEC with a LOT of harmonics. (Harbec will run very quickly since it's a linear system.) You can then plot the time response at any node. If you put a very narrow pulse with a long delay between pulses, I suspect that will work adequately for an impulse response.

Rob Lefebvre

[Originally posted in old forum by Rob Lefebvre at rob@eagleware.com]
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dougfitz_eesof Mar 14, 2003 2:27 AM
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One problem with this approach is that it can not be done without the Harmonic Balance license. We do not have this license on our system. What I was suggesting was a feature that would allow you to do an IFFT of the S21 response. It seems like this would be fairly easy to implement.
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MZachmann Mar 15, 2003 4:49 AM
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Hi,
That's a very interesting idea. We'll talk about it in-house.

It may sound kludgy but you could generate a table output - send it to file - and then have excel do an ifft on it. Obviously it would be simpler to have this facility embedded.

Mark Zachmann
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