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Need an example of how to design a controlled impedance differential pair of pcb routes

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I need an example of how to design a controlled impedance differential pair of pcb routes

using Cadsoft Eagle vsn 5.12.0.

  • 0

    Bankole Paris wrote on Mon, 13 January 2014 14:36

    I need an example of how to design a controlled impedance differential

    pair of pcb routes

    using Cadsoft Eagle vsn 5.12.0.

     

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    In V5 and before, you have to do the routing manually.  First, you need to

    figure out what the trace width and separation should be (EAGLE will not

    help you be an engineer).  Then once you have that, what I do is figure out

    what grid setting I need to get the separation exactly right when routing

    that trace width.  I do this by drawing a quick diagram and figuring out

    center-to-center spacing of the traces.  Then I usually set my grid to 1/2

    of that and then route to make sure 2 grid spaces are between the diff pair

    traces.  Diagonals are different and if you really want exact then you need

    to do some calculations and move them closer to each other.

     

    The summary is EAGLE won't help you other than letting you put traces

    exactly where you need them.  So you have to do some low-level design work

    to get these to work.  I've done dozens of boards this way and they

    function just fine.

     

    Cheers,

     

    James.

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    James Morrison  ~~~  Stratford Digital

     

    Specializing in CadSoft EAGLE

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  • 0 in reply to autodeskguest

    James,

     

    Thanks for taking the time to explain. Since i posted my question

    I saw an Altium example showing that both traces are simultaneously both traces that Eagle vsn 6 

  • 0 in reply to autodeskguest

    James,

     

    Thanks for taking the time to answer. Since I posted the question

    I saw a Altium example that shows both traces being routed simultaneously

    after a minor amount of setup. I later found out that eagle offers the same thing in vsn 6. 

  • 0 in reply to autodeskguest

    James,

     

    Sorry for the multiple sends, I keep hitting the wrong keys as I am typing.

     

    Thanks for taking the time to answer. Since I posted the question

    I saw a Altium example that shows both traces being routed simultaneously

    after a minor amount of setup. I later found out that Eagle offers the same 

    thing in vsn 6.  I am considering buying DipTrace for $895.00 since upgrade

    to Eagle vsn 6 will cost me $549.00. I have been with Eagle for years but I 

    need to save $$$. 

     

    Regards,

     

    Bankole