Regards
At 08:18 AM 6/15/99 -0700, you wrote:
>When you have a PCB stackup that has a signal plane sandwiched between two
>ground planes, you have stripline. Zo at this point is fairly easy to
>characterize.
>
>Now, if you add a second signal layer in between the two ground planes, one
>in the X direction and the other in the Y, you still have stripline
>(asymetric), but now you have a bunch of traces crossing the path above (or
>below) your signal layer. I understand this introduces crosstalk, but what
>does it do to the characteristic impedance of your traces? Is the impedance
>still controlled? Does it vary widely, or not have much effect at all?
>
>I see a lot of stackups with this arrangement, and I wonder how Zo is
>maintained.
>
>Thanks,
>
>Chris
>
>
>
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