RE: [SI-LIST] : non-monotonic

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From: Ron Miller (rmiller@brocade.com)
Date: Fri Mar 30 2001 - 08:36:38 PST


Multiple reflections on a transmission line are the most likely source of
voltage reversals on a digital signal. The driving source impedance or the
load terminating impedance might be included in the reflective sources.

Ron Miller

-----Original Message-----
From: Ritchey Lee [mailto:leeritchey@earthlink.net]
Sent: Friday, March 30, 2001 7:45 AM
To: Ravinder Ajmani
Cc: si-list@silab.eng.sun.com
Subject: Re: [SI-LIST] : non-monotonic

By nonmonotonic, do you mean that the switching edges have voltage reversals on
them? If so, there are at least two possibilities. One is an unintentional
stub on the transmission line or the power rails are not solid. That latter
means that the decoupling is no well done.

Lee

Ravinder Ajmani wrote:

> Hi,
> Can someone explain the cause of non-monotonicity. Is it caused by the
> change of impedance in the transmission medium? At times, I have also seen
> non-monotonic signals at the output pins of driver ICs.
>
> Regards, Ravinder
> PCB Development and Design Department
> IBM Corporation
> Email: ajmani@us.ibm.com
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