[SI-LIST] Re: TDR Recommendations
- From: "Rich Peyton" <p2rich@xxxxxxxxxxxxx>
- To: <jeff.loyer@xxxxxxxxx>, <ray.haynes@xxxxxxxxxxxxxxxx>,"'SI List'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 12 Nov 2003 13:24:48 -0500
Where can I get more info regarding that footswitch you referred too? I
have a Tek 11800 w/SD-24 head and was wondering if the footswitch could =
be
used for that? Take into consideration that the Tek 11800 & SD-24 head =
are
obsolete products and parts are starting to get harder/more expensive to
get! The TDS8000 is a nice window based unit.=20
Rich
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Loyer, Jeff
Sent: Wednesday, November 12, 2003 1:09 PM
To: ray.haynes@xxxxxxxxxxxxxxxx; SI List
Subject: [SI-LIST] Re: TDR Recommendations
At the risk of being considered a renegade for addressing a technical =
=3D
issue in this forum... ;-)
I've used the 1st three that you list - they should be perfectly =3D =
adequate
for what you describe. As far as I know, the 4th is just a =3D nicer
front-end. =3D20
One major challenge will be how to probe your signals, especially since =
=3D
you want to probe differentially (2 signal and 2 ground contacts =3D
simultaneously). It's possible to position your probes manually for =3D =
this,
but is pretty demanding. And, if you want to perform differential =3D =
TDT (4
signal, 4 ground, simultaneously), I would say it's virtually =3D =
impossible.
Using a probing station (and associated probes) is nicer, =3D but =
expensive.
And you'll have to spend energy carefully designing your =3D launch =
structures
to match your probes. =3D20
If you're going the manual route, I'd point out that TEK just introduced =
=3D a
cheap (<$100, and please don't call me names for saying that) =3D =
footswitch
for the TDS8000 - IMHO one of the first great innovations of =3D the =
21st
century, for TDR'ers. And, semi-rigid coax works very well for =3D a =
probe.
I had Microstock make some for me: (Microstock, Inc. =3D 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? =3D20
Ray "Gigahertz Green" Haynes
Phoenix, AZ
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