[SI-LIST] Re: Adding uncertainty to signal sources
- From: "Beal, Weston" <weston_beal@xxxxxxxxxxx>
- To: <tstrout@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Fri, 29 Oct 2004 13:22:07 -0700
Tom,
We could probably help you more if you tell us what simulator you are
using and what kind of models you are using. It looks like you are using
SPICE, and I have a utility to generate PWL voltage sources with all
kinds of data patterns and the possibility of uniform or Gaussian jitter
on the edges. Email me directly if you want the latest version of my
pulse train generator utility. You can get a slightly older version at
http://www.si-list.org/id25.htm
Regards,
Weston
=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Tom Strout
Sent: Friday, October 29, 2004 11:56 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Adding uncertainty to signal sources
Hi all - I'm a new member of SI mailing list and would like to pose a
question. I'm wondering if there is a way to add jitter or a variable
amount of uncertainty to the rising/falling edges of a signal source
such as 'pulse' or in my case the built-in PBRS function (lfsr). I'm
attempting to characterize a valid data window for a DDR2 memory
interface, and would like to introduce more uncertainty into my source
than is currently being generated by the output buffer of my SDRAM
model.
Regards,
Tom R Strout
Staff Hardware Engineer
Hifn Inc.
111 Speen St., Suite 210
Framingham, Ma. 01701
508-620-1158 x119
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=20
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