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Trace Length Variation

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scorpyann

scorpyann

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"Trace length variation across DUTs should be kept within ±100ps."

Anybody know how much "±100ps" is in any measurement (inch@mils)?

Or anybody have formula on how to calculate it for certain material such as Nelco 13 or FR-4.

Pls help me!!
 

speed of signal at FR4 PCB is 140-180ps/inch

In ur case for +-100ps

length should be 0.55-0.72 inches

with the above rule u can calculate.For more information refer to Chapter1 of High Speed Digital Design by Johnson&Graham


Regards
Abhishek
 

Hi Abishek,

Thanks for the info

Regards
Scorpyann
 

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