FreeLists / si-list / [SI-LIST] Re: TDR vs. VNA? Which to purchase?

[David Instone <dave.instone@xxxxxxxxxx>]

They do but if you just want S params and don't want to create models 
you just need the 80SSPAR package which is 4500  British pounds, 
probably cheaper elsewhere

Regards
Dave Instone
+44 (0)1235 824963




Peterson, James F (EHCOE) wrote:
> Last time I checked, Tek charged extra for the TDR's Iconnect
> SW...they're pretty proud of that software, if you know what I mean.=20
>
> -Jim
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> On Behalf Of Lars Juul
> Sent: Tuesday, February 19, 2008 10:22 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: TDR vs. VNA? Which to purchase?
>
> Hi Tom.
> For characterization and validation of new board designs, I'd personally
> go
> for the TDR, as the hunt for discontinuities and other impedance
> mismatches
> on a board is far more easy in the time domain. I believe some models
> also
> show the excess capacitance/inductance.
>
> But again, there are exceptions, depending on the interface you want to
> characterize. Take the XFP interface for instance. It has some of the
> electrical interconnect parameters defined in terms of DS11, DS21. If
> you
> want to demonstrate compliance you really do need a VNA to measure it.
>
> For video applications, I'm not sure what the requirements are, but I
> doubt
> a VNA is the answer to your questions, unless RF is involved.
>
> Hope this helps.
>
> Lars
>
> 2008/2/19, Tom Cipollone <tom_cip_11551@xxxxxxxxx>:
>   
>> Hi,
>>
>>   I realize that this thread has been done before, but as we all know,
>> technology changes pretty fast, and what might have been true a year
>>     
> or two
>   
>> ago, may not still be true today.
>>
>>   I am ready to make a large investment in signal integrity test
>>     
> equipment
>   
>> for my company. I'm probably no more than a week away from the
>>     
> decision. As
>   
>> some of you will no doubt suggest to get both, let me just say that I
>>     
> can
>   
>> not afford both. I will have one or the other.
>>
>>   I have had the demos and seen the equipment.
>>
>>   What I do for a living is design boards for digital video, that are
>> comprised of many differential pairs, routed closely together. Rising
>>     
> edges
>   
>> are in the neighborhood of 100 ps. I want to be able to find and
>>     
> modify
>   
>> discontinuities (either capacitive or inductive), determine crosstalk
>> between the pairs and measusre jitter (yes, I will need a signal
>>     
> source for
>   
>> that).
>>
>>   If this were as little as two years ago I would have believed that
>>     
> the
>   
>> VNA solution would have been the most versatile. However, Tektronix
>>     
> has made
>   
>> a lot of progress with their TDR equipment and with their "Iconnect"
>> software. Also, there is a big difference in price between the TDR
>>     
> solution
>   
>> and the VNA solution.
>>
>>   In appealing to the SI group for opinions I am trying to go beyond
>>     
> my
>   
>> own predjudice and the marketing hype.
>>
>>   Thank You
>>   Tom
>>
>>
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>
>
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