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Problem with XFRM_LINEAR Subcircuit

G Balaji
I created a subcircuit using XFRM_LINEAR (subcircuit within subcircuit) and passed a parameter to this using SUBPARAM. But when I generate the netlist, It doesn't included the parameter on PARAM list and generated the following netlist.

This is resolved when I use 2 inductors with K instead of XFRM_Linear.

 Why?

.subckt X_TXl 1 2 3 4

K_TXl         L1_TXl L2_TXl 0.998

L1_TXl         1 2 {L1_X}

L2_TXl         3 4 250u

.ends X_TXl
Parents
  • Hard to tell exactly what you did, or didn't, do from the supplied information, but the PARAM statement is missing to pass the parameter into the sub-circuit. Your model should look "something like":

    .subckt X_TXl 1 2 3 4

    +PARAM: L1_X=10u

    K_TXl         L1_TXl L2_TXl 0.998

    L1_TXl         1 2 {L1_X}

    L2_TXl         3 4 250u

    .ends X_TXl

    This would have 10u as the default value. Using the Model Editor to create a Capture part would then have "L1_X" as an editable property on the graphical part for use in a schematic. See this PSPice User Guide on Setup parameter passing to a subcircuit using Subparam.
Reply
  • Hard to tell exactly what you did, or didn't, do from the supplied information, but the PARAM statement is missing to pass the parameter into the sub-circuit. Your model should look "something like":

    .subckt X_TXl 1 2 3 4

    +PARAM: L1_X=10u

    K_TXl         L1_TXl L2_TXl 0.998

    L1_TXl         1 2 {L1_X}

    L2_TXl         3 4 250u

    .ends X_TXl

    This would have 10u as the default value. Using the Model Editor to create a Capture part would then have "L1_X" as an editable property on the graphical part for use in a schematic. See this PSPice User Guide on Setup parameter passing to a subcircuit using Subparam.
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