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ced

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Posts posted by ced


  1. Hi,
    I am a ngspice newbie and I'd like to get a frequential transfer function of a Wien filter
    as an exercise .
    I'd like to plot V(3)/ISRC versus frequency .

    Here is the .sch file I simulate :

    Tranfer function
    ISRC 1 0 AC 1
    R1 1 2 1k
    C1 2 3 1u
    R2 3 0 1k
    C2 3 0 1u
    .AC DEC 10 1 10K
    .END

    Here is the result I get :

    ngspice 1 -> run
    Doing analysis at TEMP = 27.000000 and TNOM = 27.000000

    Warning: Source isrc has no value, DC 0 assumed

    Warning: singular matrix: check nodes 1 and 1

    Note: starting dynamic Gmin stepping
    Trying gmin = 1.0000E-03 Note: One successful Gmin step
    Trying gmin = 1.0000E-04 Note: One successful Gmin step
    Trying gmin = 1.0000E-05 Note: One successful Gmin step
    Trying gmin = 1.0000E-06 Note: One successful Gmin step
    Trying gmin = 1.0000E-07 Note: One successful Gmin step
    Trying gmin = 1.0000E-08 Note: One successful Gmin step
    Trying gmin = 1.0000E-09 Note: One successful Gmin step
    Trying gmin = 1.0000E-10 Note: One successful Gmin step
    Trying gmin = 1.0000E-11 Note: One successful Gmin step
    Trying gmin = 1.0000E-12 Note: One successful Gmin step
    Trying gmin = 1.0000E-12 Note: One successful Gmin step
    Warning: singular matrix: check nodes 1 and 1

    Warning: Dynamic Gmin stepping failed
    Note: starting source stepping
    Supplies reduced to 0.0000% Warning: singular matrix: check nodes 1 and 1


    Trying gmin = 1.0000E-02 Note: One successful Gmin step
    Trying gmin = 1.0000E-03 Note: One successful Gmin step
    Trying gmin = 1.0000E-04 Note: One successful Gmin step
    Trying gmin = 1.0000E-05 Note: One successful Gmin step
    Trying gmin = 1.0000E-06 Note: One successful Gmin step
    Trying gmin = 1.0000E-07 Note: One successful Gmin step
    Trying gmin = 1.0000E-08 Note: One successful Gmin step
    Trying gmin = 1.0000E-09 Note: One successful Gmin step
    Trying gmin = 1.0000E-10 Note: One successful Gmin step
    Trying gmin = 1.0000E-11 Note: One successful Gmin step
    Trying gmin = 1.0000E-12 Note: One successful Gmin step
    Note: One successful source step
    Supplies reduced to 0.1000% Warning: singular matrix: check nodes 1 and 1

    Supplies reduced to 0.0000% Warning: singular matrix: check nodes 1 and 1

    Warning: source stepping failed

    AC operating point failed -

    Last Node Voltages
    ------------------

    Node Last Voltage Previous Iter
    ---- ------------ -------------
    1 0 0
    2 0 0
    3 0 0

    doAnalyses: iteration limit reached

    run simulation(s) aborted

    Does someone has an idea about what's wrong in the scheme file ?
    Thanks for your help,
    ced

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