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Richard Hammerl

Richard is an engineer with 16 years experience in EAGLE customer support and is waiting for your questions.

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heedaf over 15 years ago

Hi,
What is the best way to run a differential pair? Is there any tricks or files I can run to help the process out?
Thanks,
DR
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levafreidin over 15 years ago in reply to heedaf

Hello Heedaf,
     I am sure there are files... but I make one trace from the pair wide as the sum of final traces + gap of the differential pair. After I finish layout, I change its width back to normal - and now there is enough room to place both traces in parallel.
    If you want to place traces in different layers (to do it you need, most probably, multilayer PCB), place one (let say, "top") trace first, keep room under it free than layout, "cut" whole trace (as "group"), "paste" trace at the empty space, change its layer to "bottom" and move it as "group" to the designated place.
    Lev.
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Richard_H over 15 years ago in reply to levafreidin

Hi Lev and Don,

there are two ULPs that can help.
length.ulp gives a list of all signals with its total lengths or when used with for example two signal names

RUN length signal 1 signal2

it gives a list of these two signals only.
There is also length-freq-ri.ulp which gives a bit more information in the list of all signals. Try it.

Regards,
Richard
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Richard_H over 15 years ago in reply to heedaf

Hi,

no sorry, currently no help in placing traces. But Lev's ideas sounds very good.

Regards,
Richard
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heedaf over 15 years ago in reply to Richard_H

This only provides the lenghts of the signals? What about help in placing the traces?
Thanks,
DeWayne
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heedaf over 15 years ago in reply to Richard_H

This only provides the lenghts of the signals? What about help in placing the traces?
Thanks,
DeWayne
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Richard_H over 15 years ago in reply to heedaf

Hi,

no sorry, currently no help in placing traces. But Lev's ideas sounds very good.

Regards,
Richard
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