FreeLists / si-list / [SI-LIST] Skew boards

[Hora Abu <arageeb@xxxxxxxxx>]

Dear SI- Subscriber list:

Dear SI- Subscriber list:

I am newly working for a company which build high speed board for data 
communication.  A new silicon is being released and we were asked to build 
skewed boards to validate silicon at different corners of the process.   Target 
board impedance is 100 diff +/- 20% and so we are to build board with high 
impedance and others with low impedance (120Ohms +/- 5% & 80Ohms +/-5%) where 
the high impedance will be combined with slow silicon and low impedance with 
fast silicon.    What sense does this make?  To my knowledge the board 
impedance has no effect on signal propagation (signal speed is C/sort(Er)  ).   
I can understand building and testing skewed silicon to test the process limits 
but I can understand why it has to be tested with skewed boards.  If the speed 
is not the issue may the requirement is test signal integrity with different 
silicon?  If this the case then what silicon goes with what board impedance and 
why?

 

Could someone help clarify this?

 

Thanks

Argov



---------------------------------
Do you Yahoo!?
Yahoo! Mail Plus - Powerful. Affordable. Sign up now

------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages 
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu