[SI-LIST] Re: TDR Recommendations
- From: "Dima Smolyansky" <Dima.Smolyansky@xxxxxxxxxxxxxx>
- To: <ray.haynes@xxxxxxxxxxxxxxxx>, "SI List" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 12 Nov 2003 12:44:41 -0800
Ray,
If you are trying to TDR traces which jump between layers and change
impedance, you will run into the issue known as multiple reflections. If you
would like to learn more, check out the appnote "TDR Primer," or "PCB
Interconnect Characterization from TDR Measurements" on our web site,
www.tdasystems.com/support
You will also find a number of other appnotes there related to SI analysis
of gigabit links using TDR and VNA.
Thanks,
===================
Dima Smolyansky
TDA Systems, Inc.
4000 Kruse Way Place
Bldg. 2, Suite 300
Lake Oswego, OR 97035
(503) 246-2272
(503) 246-2282 (fax)
Download new IConnect 3.0 Quick Tour at www.tdasystems.com/products/ !
----- Original Message -----
From: "Ray Haynes" <ray.haynes@xxxxxxxxxxxxxxxx>
To: "SI List" <si-list@xxxxxxxxxxxxx>
Sent: Tuesday, November 11, 2003 11:21 PM
Subject: [SI-LIST] TDR Recommendations
> Good day list members,
> I need some guidance. We have just competed a design that uses 2Gb/s
> proprietary communication channels to interconnect boards. I will be
> getting the artwork on the first board back soon and I'm going to need
> to do some SI work on it. These frequencies are a magnitude higher than
> anything I have worked with before. We were very conservative on the
> layout but I'm going to want to verify the artwork with a TDR scope.
>
> I'm thinking 20GHz bandwidth for the scope and a pulse rise time should
> probably be better than 50ps. The signals are differential so I need
> that capability in the TDR Head. Does this sound about right?
>
> If my assumptions are correct then are these likely candidates?
> Tek 11800 series with SD24 TDR Sampling Head
> Tek TDS8000 with 80E04 TDR Sampling Module
> Agilent 54750 with 53754A TDR module
> Agilent 86100 DCA w/ 53754A Differential TDR Module
>
> Am I in the ball park?
>
> Ray "Gigahertz Green" Haynes
> Phoenix, AZ
>
>
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