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Subject:	Re: How stable and repeatable are PCB transmission character
From:	[log in to unmask]
Date:	Thu, 24 Apr 97 17:19:45 EDT
Content-Type:	text/plain
Parts/Attachments:	text/plain (37 lines)

m designing a highspeed processor board and have come to the amazing 
requirement of having a VERY precise delay of 4.8 +/- .25 nanoseconds.
  
Is this achievable in volume production printed circuit boards? 
I am using FR4 medium and have 8 layers to work with. What geometries 
and layering are best?
  
My alternatives a custom/graded silicon delay lines or, perish the thought, 
an
adjustment pot. Please help!!
  
  
Ray Klein 
  
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