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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

  • You have a subcircuit "calling" a subcircuit, in this case use the "@" construct, rather than the "{}" construct. If you specify the L1 value as "@LVAL" rather than "{LVAL}", the SUBPARAM parameter will be correctly substituted in the "called" subcircuit. Strictly speaking, the "{}" construct specifies a Global parameter, from a PARAM part, rather than a sub-parameter, from a SUBPARAMS part, although the "{}" construct often works!

Reply

  • You have a subcircuit "calling" a subcircuit, in this case use the "@" construct, rather than the "{}" construct. If you specify the L1 value as "@LVAL" rather than "{LVAL}", the SUBPARAM parameter will be correctly substituted in the "called" subcircuit. Strictly speaking, the "{}" construct specifies a Global parameter, from a PARAM part, rather than a sub-parameter, from a SUBPARAMS part, although the "{}" construct often works!

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