RE: [SI-LIST] : modeling languages (was: receiver jitter)

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From: Muranyi, Arpad (arpad.muranyi@intel.com)
Date: Fri Jan 21 2000 - 12:39:07 PST


Jim,

I agree, but you can already do that by repeating the original
voltage or current waveform with a VCVS or CCVS respectively,
across which you have a capacitor connected. The current of the
capacitor is your first derivative. However, for some unknown
reason I could not cascade this circuit to obtain 2nd derivatives
I got all kinds of numerical oscillations. Does anyone know why?

BTW: HSPICE can give you derivatives with the measure statement too.
What I wish is that they would not only give it at a requested time,
but also tell me at what time it was a certain value (like zero)...

Arpad Muranyi
Intel Corporation
==================================================================
-----Original Message-----
From: Jim Freeman [mailto:freeman@broadcom.com]
Sent: Friday, January 21, 2000 12:20 PM
To: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : modeling languages (was: receiver jitter)

Hi All,
    I think that a feature to continuously measure the derivative of a nodal
voltage or current would be very useful in I/O buffer simulations.

Jim Freeman

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