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Via to ground for microstrip design in ADS

Discussion in 'Electronic Design' started by steve, Jun 16, 2006.

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  1. steve

    steve Guest

    Hey folks,

    I've been working on a microstrip board layout in ADS for a relatively
    simple PA. As part of the design I have a stabilization resistor that
    shunts the gate of the active device to ground. My problem lies in
    performing a momentum simulation of the input matching network with
    this shunt branch. When I perform the simulation on the schematic
    level in ADS I get one response, upon trying to verify the same
    response in the EM simulation I find it behaves completely differently.

    After some investigation, I've found that the same behaviour that
    results in the EM simulator can be duplicated in the schematic
    simulator by deleting the ground symbol that is at the bottom of the
    shunt stabilizing resistor. What this boils down to is that the EM
    simulator will not recognize my shorts to ground and is leaving one end
    of the shunt resistor floating.

    I've tried a few things to get a working short to ground: Short-circuit
    stubs and vias to ground.

    My question to you all is: To use the VIAGND element in layout for a
    microstrip design in ADS what layers should I be using for conductor
    (I've tried cond) and hole (I've tried cond and hole)? If one of the
    things I mentioned above was actually right, is there something else
    that I'm missing?

    Thanks in advance,

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