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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

  •  To explain clearly what I did, please find attached snap shot of two models, where model – 1 uses two inductors and K. whereas in model – 2 XFRM_Linear is used instead.
    Given below are the netlists generated by model-1 and model-2 respectively and these netlists are created using “Create Netlist” command in capture project manager.


    Model - 1
    * source LIBRARY_TR
    .SUBCKT TR P1 P2 S1 S2 PARAMS: LVAL=10U
    C_C1         P1 N2433146  1n  TC=0,0
    L_L1_40         S1 S2  {Lval}  
    Kn_K2         L_L1_40 L_L2_40     0.998
    L_L2_40         N2433146 P2  250u  
    .ENDS

    Model – 2
    * source LIBRARY_XTR
    .SUBCKT XTR P1 P2 S1 S2 PARAMS: LVAL=10U
    X_TX1    N00597 P2 S1 S2 XTR_TX1
    C_C1         N00597 P1  10u  TC=0,0
    .ENDS

    .subckt XTR_TX1 1 2 3 4  
    K_TX1         L1_TX1 L2_TX1 1
    L1_TX1         1 2 {LVal}
    L2_TX1         3 4 10uH
    .ends XTR_TX1

    Absolutely Model-1 doesn’t have any problem. But, in Model-2, as you said, It suppose to include +PARAM: L1_X=10u in XTR_TX1 subcircuit and when X_TX1 is called the value LVAL need to passed to this subcircuit.
    I’m expecting this to happen automatically as I’m generating netlist from capture project manager.

Reply

  •  To explain clearly what I did, please find attached snap shot of two models, where model – 1 uses two inductors and K. whereas in model – 2 XFRM_Linear is used instead.
    Given below are the netlists generated by model-1 and model-2 respectively and these netlists are created using “Create Netlist” command in capture project manager.


    Model - 1
    * source LIBRARY_TR
    .SUBCKT TR P1 P2 S1 S2 PARAMS: LVAL=10U
    C_C1         P1 N2433146  1n  TC=0,0
    L_L1_40         S1 S2  {Lval}  
    Kn_K2         L_L1_40 L_L2_40     0.998
    L_L2_40         N2433146 P2  250u  
    .ENDS

    Model – 2
    * source LIBRARY_XTR
    .SUBCKT XTR P1 P2 S1 S2 PARAMS: LVAL=10U
    X_TX1    N00597 P2 S1 S2 XTR_TX1
    C_C1         N00597 P1  10u  TC=0,0
    .ENDS

    .subckt XTR_TX1 1 2 3 4  
    K_TX1         L1_TX1 L2_TX1 1
    L1_TX1         1 2 {LVal}
    L2_TX1         3 4 10uH
    .ends XTR_TX1

    Absolutely Model-1 doesn’t have any problem. But, in Model-2, as you said, It suppose to include +PARAM: L1_X=10u in XTR_TX1 subcircuit and when X_TX1 is called the value LVAL need to passed to this subcircuit.
    I’m expecting this to happen automatically as I’m generating netlist from capture project manager.

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