[SI-LIST] Re: A question for the instrument guys on TDR and TDT
From: <dmitry.a.smolyansky@xxxxxxxxxxxxxx>
To: <Chris.Cheng@xxxxxxxxxxxx>, <dgun@xxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
Date: Wed, 15 Nov 2006 08:14:29 -0800
On the question of cost - actually, TDR is never more expensive than a
VNA. Check it out yourself: A TDR scope with a 15ps reflected (12 ps
incident) rise time, capable of 50 GHz worth of S-parameters, will be
about 30% cheaper than a comparable 50 GHz 4-port network analyzer.
Don't take my word for it, check it out yourself.=20
And, with that TDR scope, you will also get 50 GHz sampling and jitter
measurement capability for free. You decide what makes sense for your
serial data application.
Thanks,
=20
Dima Smolyansky
Product Marketing Manager
Tektronix, Inc.
P.O. Box 500, MS 39-111
Beaverton, OR 97077-0001
503-627-7180
503-627-2260 (fax)
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Chris Cheng
Sent: Tuesday, November 14, 2006 4:51 PM
To: dgun@xxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT
I can only speak from a system design perspective. The high speed =3D
sampling scope is free because that's basic lab equipment every hardware
=3D
manager will budget for his lab. A VNA is an extra equipment solely =3D
used for channel modelling/testing or the remote possibility of PD =3D
analysis. I never believe in highspeed PD problem beyond the die and =3D
package so I never can justify a VNA other than channel measurements. I
=3D
do have both but I think an impulse response on a sampling scope can =3D
satisfies a lot of system designers need for S-parameter measurements. =
=3D
And I believe that scope company up North is listening :-D (just came =
=3D
back from their seminar, LOL)
Now if I can use that VNA budget for a Ferrari......
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of dgun@xxxxxxxxxx
Sent: Tuesday, November 14, 2006 4:04 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: A question for the instrument guys on TDR and TDT
Wouldn't a scope fast enough to capture the reflections or transmissions
of a 35ps pulse be as or more expensive than a low-cost VNA?
--
Daniel
> From: "Chris Cheng" <Chris.Cheng@xxxxxxxxxxxx>
>
> I can understand the merit of a step response and direct read out of =
=3D
=3D3D3D
> impedance profile.
> Will it be easy to also include a mode with a sharp pulse instead of =
=3D
=3D3D3D
> step for an impulse response ? If you have a circuit to generate a =3D
35ps =3D3D
=3D3D3D
> step, can you use it to generate a 35ps pulse also ? I think there are
=3D
=3D3D
=3D3D3D
> steps you can do to convert one to the other but a direct impulse =3D
=3D3D3D
> response is just too good to pass up.
> Network analyzer on the cheap.
> Thanks in advanced,
> Chris
--=3D3D20
Search for products and services at:=3D3D20
http://search.mail.com
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