[SI-LIST] : Equivalent ckt of coupling/via parasitics

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From: Hassan Ali (hali@nortelnetworks.com)
Date: Thu Mar 22 2001 - 15:12:17 PST


Below is a poor sketch of a differential pair routed around a via in one
layer of a PCB, call it Layer2. The via routes a single-ended signal from
Layer1 (above Layer2) to Layer3 (below Layer2). I need to compute the
crosstalk between the diff-pair and the single-ended signal. To do that, I
have to obtain the equivalent circuit that takes into account self
parasitics of the via and the coupling between the via and the diff-pair.
Does anybody know how this equivalent circuit should be? I'd also appreciate
it if someone can show me how to accurately compute all the parameters of
the equivalent circuit.
 
                                                single-ended signal (from
node 5 to node 6 thru the via)
           3 4 5 ____________
           | | ||
           | | ---------- ||------------ gnd
plane
          /via \ diff-pair ||via
    5 ---|--0---|----- 6 normal to screen 1.||.2
          \ / ___________ ||____________ gnd
plane
           | | ||
           | | diff pair ||
           1 2 (line1 from node 1 to 3) ---------- 6
                (line2 from node 2 to 4)

Thanks.

Hassan.

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