Hallo,
will mir ein 4 Bit R-String DA-Wandler in NGSPICE simulieren und hab mir dazu eine Netzliste geschrieben. Ich will eine Transientenanalyse durchführen, also Spannungsverlauf an verschiedenen Knoten über der Zeit. Wenn ich die Netzliste lade bekome ich keinen Fehler, also sollte sie ja in Ordnung sein - zumindest für Spice. Wenn ich die Simulation per RUN Befehl starte gibt er mir ein paar Berechnungen aus und dann kommt die Fehlermeldung: [highlight=red:e7a9b836aa]doAnalyses: iteration limit reached[/highlight:e7a9b836aa]
Also ich geh mal davon aus dass der Fehler nichts mit der eigendlichen Schaltung zu tun hat sondern das er generell ein Problem mit der Simulation hat ? Wobei ich dazu sagen muss das eine andere Schaltung auch mit dieser Analyseart prima funktioniert...
Hier mal die Netzliste und die Ausgabe von Spice:
Netzliste:
Hier die Ausgabe:Code:4 Bit R-String DA-Wandler .incl mietec035_ngspice.txt Vref 9 0 DC 1 VAo 1 0 PULSE(0 3 0 0.01n 0.01n 2.5ns 5ns) VAon 5 0 PULSE(3 0 0 0.01n 0.01n 2.5ns 5ns) VA1 2 0 PULSE(0 3 0 0.01n 0.01n 5ns 10ns) VA1n 6 0 PULSE(3 0 0 0.01n 0.01n 5ns 10ns) VA2 3 0 PULSE(0 3 0 0.01n 0.01n 10ns 20ns) VA2n 7 0 PULSE(3 0 0 0.01n 0.01n 10ns 20ns) VA3 4 0 PULSE(0 3 0 0.01n 0.01n 20ns 40ns) VA3n 8 0 PULSE(3 0 0 0.01n 0.01n 20ns 40ns) .subckt X 50 51 52 R1 50 51 7 M1 50 1 52 0 EN3 W=7u L=1u M2 51 5 52 0 EN3 W=7u L=1u .ends X1 9 10 24 X R2 10 11 7 X2 11 12 25 X R3 12 13 7 X3 13 14 26 X R4 14 15 7 X4 15 16 27 X R5 16 17 7 X5 17 18 28 X R6 18 19 7 X6 19 20 29 X R7 20 21 7 X7 21 22 30 X R8 22 23 7 X8 23 0 31 X M3 24 2 32 0 EN3 W=7u L=1u M4 25 6 32 0 EN3 W=7u L=1u M5 26 2 33 0 EN3 W=7u L=1u M6 27 6 33 0 EN3 W=7u L=1u M7 28 2 34 0 EN3 W=7u L=1u M8 29 6 34 0 EN3 W=7u L=1u M9 30 2 35 0 EN3 W=7u L=1u M10 31 6 35 0 EN3 W=7u L=1u M11 32 3 36 0 EN3 W=7u L=1u M12 33 7 36 0 EN3 W=7u L=1u M13 34 3 37 0 EN3 W=7u L=1u M14 35 7 37 0 EN3 W=7u L=1u M15 36 4 38 0 EN3 W=7u L=1u M16 37 8 38 0 EN3 W=7u L=1u C1 38 0 100p E1 39 0 38 0 1 .tran 1n 2000n
Währe cool wenn mir da jemand helfen könnte.Code:ngspice 3 -> run Doing analysis at TEMP = 27.000000 and TNOM = 27.000000 Warning: Pd = 0 is less than W. Warning: Ps = 0 is less than W. Warning: va3n: no DC value, transient time 0 value used Warning: va3: no DC value, transient time 0 value used Warning: va2n: no DC value, transient time 0 value used Warning: va2: no DC value, transient time 0 value used Warning: va1n: no DC value, transient time 0 value used Warning: va1: no DC value, transient time 0 value used Warning: vaon: no DC value, transient time 0 value used Warning: vao: no DC value, transient time 0 value used Warning: singular matrix: check nodes x1.1 and x1.1 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 x1.1 and x1.1 Warning: Dynamic Gmin stepping failed Note: starting source stepping Supplies reduced to 0.0000% Warning: singular matrix: check nodes x1.1 and x1.1 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 x1.1 and x1.1 Supplies reduced to 0.0000% Warning: singular matrix: check nodes x1.1 and x1.1 Warning: source stepping failed Transient solution failed - Last Node Voltages ------------------ Node Last Voltage Previous Iter ---- ------------ ------------- 9 0 0 1 0 0 5 0 0 2 0 0 6 0 0 3 0 0 7 0 0 4 0 0 8 0 0 10 -1.93709e-81 0 x1.1 0 0 24 3.21909e-71 0 x1.5 0 0 11 -3.60424e-81 0 12 -5.00275e-81 0 x2.1 0 0 25 3.21084e-71 0 x2.5 0 0 13 -6.13262e-81 0 14 -6.98073e-81 0 x3.1 0 0 26 3.3326e-71 0 x3.5 0 0 15 -7.5471e-81 0 16 -7.83028e-81 0 x4.1 0 0 27 3.34174e-71 0 x4.5 0 0 17 -7.83028e-81 0 18 -7.5471e-81 0 x5.1 0 0 28 3.34174e-71 0 x5.5 0 0 19 -6.98073e-81 0 20 -6.13261e-81 0 x6.1 0 0 29 3.3326e-71 0 x6.5 0 0 21 -5.00274e-81 0 22 -3.60423e-81 0 x7.1 0 0 30 3.21084e-71 0 x7.5 0 0 23 -1.93708e-81 0 x8.1 0 0 31 3.21909e-71 0 x8.5 0 0 32 -8.52978e-71 0 33 -8.70274e-71 0 34 -8.70274e-71 0 35 -8.52978e-71 0 36 1.42939e-70 0 37 1.42939e-70 0 38 -1.54829e-70 0 39 -1.54829e-70 0 e1#branch 0 0 va3n#branch 0 0 va3#branch 0 0 va2n#branch 0 0 va2#branch 0 0 va1n#branch 0 0 va1#branch 0 0 vaon#branch 0 0 vao#branch 0 0 vref#branch -3.15289e-82 0 doAnalyses: iteration limit reached run simulation(s) aborted ngspice 4 ->
Gruß Markus
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