stackup signal reference to pwr or ground

  1. jqin1108
    jqin1108
    Hello,

    If for multilayer PCB, high speed signal is sandwiched between pwr and gnd plane. Does it matter the HS signal better close to gnd plane, ie minimize the noise to pwr plane, or it should be in the middle, ie pwr and gnd has same important factor. Thanks!
  2. SHABU
    SHABU
    Hi,

    Unless the high speed signal crosses the splits, it doesn't matter running a high speed signal sandwiched between Pwr and ground plane.
    Make sure the power layer is solid without splits, Else make sure high speed don't cross splits.

    SHABU
  3. SIandEMC
    SIandEMC
    Hi,
    I work with HDS PCBs every days, for example a good stack up is the following:
    6 layer backplanes low cost
    -signal\pwr
    -gnd\prw
    -signal hs
    -signal hs
    -gnd\pwr
    -signal\pwr
    for 10 layer
    S
    G
    S
    S
    P
    P
    S
    S
    G
    S
    For me those are good PCB with limitate sandwich because more layer=more cost.
    ALEX
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