[SI-LIST] Re: TDR Recommendations
- From: "Loyer, Jeff" <jeff.loyer@xxxxxxxxx>
- To: <ray.haynes@xxxxxxxxxxxxxxxx>, "SI List" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 12 Nov 2003 10:09:05 -0800
At the risk of being considered a renegade for addressing a technical =
issue in this forum... ;-)
I've used the 1st three that you list - they should be perfectly =
adequate for what you describe. As far as I know, the 4th is just a =
nicer front-end. =20
One major challenge will be how to probe your signals, especially since =
you want to probe differentially (2 signal and 2 ground contacts =
simultaneously). It's possible to position your probes manually for =
this, but is pretty demanding. And, if you want to perform differential =
TDT (4 signal, 4 ground, simultaneously), I would say it's virtually =
impossible. Using a probing station (and associated probes) is nicer, =
but expensive. And you'll have to spend energy carefully designing your =
launch structures to match your probes. =20
If you're going the manual route, I'd point out that TEK just introduced =
a cheap (<$100, and please don't call me names for saying that) =
footswitch for the TDS8000 - IMHO one of the first great innovations of =
the 21st century, for TDR'ers. And, semi-rigid coax works very well for =
a probe. I had Microstock make some for me: (Microstock, Inc. =
SKRHSO32400-2, 50ohm Probe (.085")).
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Ray Haynes
Sent: Tuesday, November 11, 2003 11:22 PM
To: SI List
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? =20
Ray "Gigahertz Green" Haynes
Phoenix, AZ
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