[SI-LIST] AW: Designing a high speed test fixture.

Hi Padma,

DesignCon is a good source for such papers. Since many of the authors are on 
the SI-List, I will not list all the papers (people may get mad at me if I miss 
one ;-)). 
Test fixtures for Connectors can be very tricky, and the "general approach" you 
will find in many papers very often doesn't get you where you want.

Depending on the desired accuracy you can chose to:
- measure including testfixture and deembed in a post processing using an 
approximated SPICE or transmission line model (easy, but not very accurate)
- characterise the testfixture and use this data for deembedding (accurate but 
complicated)
- use TRL structures on your testfixture (accurate, but very restrictive for 
higher speeds, i.e. each connection to the connector must be isolated because 
any coupling to neigboring pairs is ignored by the TRL routine)

In either way, your fixture must have good coax launches and low loss and low 
dispersion in order to get a good deembedding. There are also great Designcon 
papers about designing good launches.

Good Luck

BR
Gert


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Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im 
Auftrag von padma gundala
Gesendet: Donnerstag, 14. Mai 2009 00:10
An: si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Designing a high speed test fixture.

Hi,
 
I'm designing a test fixture which will be used to test a high speed mezzanine 
connector for signal integrity characteristics.
Just wondering if anyone has come across a good technical article/info  on 
designing test fixtures .
 
Thanks
Padma

      
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