fonction de transfert avec ngspice

Bonsoir, J'aimerais effectuer la fonction de transfert d'un filtre. Voici le fichier a.sch :

Fonction de transfert d'un filtre de Wien 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

J'utilise ngspice-19 .

Je lance la simulation et voici les messages d'erreurs :

Doing analysis at TEMP =3D 27.000000 and TNOM =3D 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 =3D 1.0000E-03 Note: One successful Gmin step Trying gmin =3D 1.0000E-04 Note: One successful Gmin step Trying gmin =3D 1.0000E-05 Note: One successful Gmin step Trying gmin =3D 1.0000E-06 Note: One successful Gmin step Trying gmin =3D 1.0000E-07 Note: One successful Gmin step Trying gmin =3D 1.0000E-08 Note: One successful Gmin step Trying gmin =3D 1.0000E-09 Note: One successful Gmin step Trying gmin =3D 1.0000E-10 Note: One successful Gmin step Trying gmin =3D 1.0000E-11 Note: One successful Gmin step Trying gmin =3D 1.0000E-12 Note: One successful Gmin step Trying gmin =3D 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 =3D 1.0000E-02 Note: One successful Gmin step Trying gmin =3D 1.0000E-03 Note: One successful Gmin step Trying gmin =3D 1.0000E-04 Note: One successful Gmin step Trying gmin =3D 1.0000E-05 Note: One successful Gmin step Trying gmin =3D 1.0000E-06 Note: One successful Gmin step Trying gmin =3D 1.0000E-07 Note: One successful Gmin step Trying gmin =3D 1.0000E-08 Note: One successful Gmin step Trying gmin =3D 1.0000E-09 Note: One successful Gmin step Trying gmin =3D 1.0000E-10 Note: One successful Gmin step Trying gmin =3D 1.0000E-11 Note: One successful Gmin step Trying gmin =3D 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

Qu'est ce qui ne va pas ? Merci pour votre aide, C=E9dric

Reply to
cedric
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On Aug 23, 8:00 pm, cedric

[ supprime tout le copie/colle ]

T'aurais pas plutot un bon vieux schema ?

Sinon, pour Spice il doit y avoir un groupe de discussion specialise pour t'aider a debugger ton devoir de vacances.

Reply to
Jean-Christophe

Moi, j'aimerais bien savoir comment faire bouffer des netlists comme celles du message du départ à Orcad Pspice 9 !

--
cLx
Reply to
cLx

On 23 ao=FBt, 21:27, cLx

es

Tu connais pas un NG sp=E9cialis=E9 "Spice" pour aider notre OP ?

Reply to
Jean-Christophe

On 23 ao=FBt, 20:00, cedric :

Il manque un parametre pour ISRC

Un probleme au point #1 (peut-etre du au warning precedent ?)

Reply to
Jean-Christophe

J'ai trouv=E9 la mailing list sp=E9ciale pour ngspice . Il manquait un "dc path" entre le noeud 1 et la masse. J'ai rajout=E9 une r=E9sistance maousse et =E7a marche nickel . Merci pour vos suggestions diverses, Ciao

Reply to
cedric

On Aug 24, 5:28=A0pm, cedric

Tu peux nous donner son adresse ici ?

Reply to
Jean-Christophe

Oui c'est snipped-for-privacy@moria.seul.org

mais il faut d'abord s'inscrire =E0 cette adresse

formatting link

Je r=E9cup=E8re les messages de la liste, et y a pas avalanche ...

Pour info, j'ai essay=E9 sur XP LTspice qui est gratuit et bien mieux , c'est sans comparaison =E0 mon avis. A +

Reply to
cedric

On Aug 25, 7:37=A0pm, cedric

| Oui c'est snipped-for-privacy@moria.seul.org

Ah ben elle est un peu coup=E9e, tu pourrais la splitter please ?

Okay : merci pour l'info Cedric !

Reply to
Jean-Christophe

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