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How to Route Differential Pairs

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dmd4raj

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differential pair routing

I am new to Orcad Layout plus,and am designing board for Ethernet. Is there any Consideration to route Differential Pairs. and what are the steps has to be considered for routing.Maximum speed of my Ethernet board is 10MBPS


Regards
Rajan.K
 

routing differential pairs

hi rajan
Two common methods to route Differential pairs are Microstrip and strip lines.Differential pair in PCB is equivalent to twisted-pair wire. just refer orcad help files on how to layout these methods
 

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    dmd4raj

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100 ohm differential pair

For 10 MBit, it should be sufficient to route the traces adjacent with default signal trace width and default trace-to-trace clearance. That's also, what an autorouter does without additional parameters supplied for a differential pair. For higher signal frequencies, it's meaningful to adjust width and/or gap to achieve a 100 ohm differential impedance.
 

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    dmd4raj

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