[SI-LIST] Re: TDR vs. VNA? Which to purchase?
- From: dmitry.a.smolyansky@xxxxxxxxxxxxx
- To: <ctwardy@xxxxxxxxxx>, <vinu@xxxxxxxxx>
- Date: Thu, 21 Feb 2008 09:51:24 -0800
Craig,
Resolution and resolution are evidently different. If you are talking
about generic rule of thumb of time resolution being 1/2 the rise time
of the stimulus (which is supported by the IPC TM-650 document), then I
believe this is what Vinu and I were quoting. If you are quoting phase
accuracy, this is a different issue.
Thanks,
=3D20
Dima Smolyansky
Tektronix, Inc.
P.O. Box 500, MS 39-111
Beaverton, OR 97077-0001
503-627-7180
503-627-2260 (fax)
-----Original Message-----
From: Craig Twardy [mailto:ctwardy@xxxxxxxxxx]=3D20
Sent: Thursday, February 21, 2008 5:24 AM
To: Vinu Arumugham; Smolyansky, Dmitry A
Cc: kuifeng@xxxxxxxxx; tom_cip_11551@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: TDR vs. VNA? Which to purchase?
Hi Vinu;
I have seen better time resolution than this with a VNA.
The VNA can also resolve phase to less than 10 degrees at 20GHz.
Does that not put the time resolution at something less than 2 psec?
Craig=3D20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Vinu Arumugham
Sent: February 19, 2008 4:06 PM
To: dmitry.a.smolyansky@xxxxxxxxxxxxx
Cc: kuifeng@xxxxxxxxx; tom_cip_11551@xxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: TDR vs. VNA? Which to purchase?
With 20 GHz data from a VNA, the time domain resolution is 25ps. If the
TDR approach works to 20Gbps, it seems like the time resolution must be
much better?
Thanks,
Vinu
dmitry.a.smolyansky@xxxxxxxxxxxxx wrote:
> Hello,
>
> I would disagree on TDR cons. I would address them using Tektronix
as=3D20
> an example, since this is the company I work for. (it also =
appears=3D20
> that Kuifeng's comments are based on his experience with Agilent
TDR,=3D20
> not Tektronix one).
> 1. "3rd party software?" How is that? IConnect, for example, is a=3D20
> Tektronix tool; the same Tektronix that makes 50 GHz TDR. Perhaps=3D20
> Kuifeng meant - "separate software tool," but I am not sure that
this=3D20
> is much of a drawback.
> 2. "Complete characterization is time consuming." I presume here =
we=3D20
> are talking about 4-port data collection. There are scripts
available=3D20
> from Tektronix to do this using IConnect. Certainly no more time=3D20
> consuming than with a VNA - as a matter of fact, less time
consuming=3D20
> because of simpler calibration.
> 3. "Need sig gen for eye diagrams." Incorrect. IConnect has fully=3D20
> automated eye diagram generation using TDR/T or S-parameter data, with
> equalization, eye mask and jitter/noise pass/fail testing. This =
all=3D20
> has programmatic interfaces for automation. Far more advanced =
than=3D20
> that on a VNA 4. "RLGC model extraction" - can't claim this is as =
a=3D20
> disadvantage.
> IConnect has extensive TDR-based behavioral and topological
modeling,=3D20
> so this is just one of many capabilities that it has.
>
> I do agree on TDR "quick and easy," and VNA "most accurate" part.
We=3D20
> have demonstrated appropriate accuracy for TDR-based S-parameter=3D20
> measurements, however, for datarates all the way to 20 Gbps.
>
> Thanks,
> =3D3D20
> Dima Smolyansky
> Tektronix, Inc.
> P.O. Box 500, MS 39-111
> Beaverton, OR 97077-0001
> 503-627-7180
> 503-627-2260 (fax)
>
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