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ced

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  1. Hi, There was no dc path between node 1 and ground . Adding a very large resistor between both nodes solved the problem Good Bye, C
  2. 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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