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Qucs / qucs-test

Qucs Project test suite and scripts repository
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testsuite/TR_sawtooth-3_prj/ cannot start #1

Open guitorri opened 10 years ago

guitorri commented 10 years ago

This circuit ends with a singular jacobian error. Note that if one of the capacitors is given a initial voltage, the circuit gets out of meta-stability and the simulation proceeds. Adding a DC simulation does not help either. Is there something we can do to improve qucsator in this case?

WARNING: Transient: inserted virtual resistance at node `Vf' connected to [V1,RfT2,RfL1,RfL2,RfT1]
WARNING: Transient: inserted virtual resistance at node `VfT2' connected to [_Rbb#T_BC817_16_2,Cp1,RfT1]
WARNING: Transient: inserted virtual resistance at node `_base#T_BC817_16_2' connected to [_Rbb#T_BC817_16_2,T_BC817_16_2]
WARNING: Transient: inserted virtual resistance at node `_net0' connected to [_Rc#T_BC817_16_2,Cp2,T_BC817_16_2,RfL2]
WARNING: Transient: inserted virtual resistance at node `_collector#T_BC817_16_2' connected to [_Rc#T_BC817_16_2,T_BC817_16_2]
WARNING: Transient: inserted virtual resistance at node `_emitter#T_BC817_16_2' connected to [_Re#T_BC817_16_2,T_BC817_16_2]
WARNING: Transient: inserted virtual resistance at node `VfT1' connected to [_Rbb#T_BC817_16_1,Cp2,RfT2]
WARNING: Transient: inserted virtual resistance at node `_base#T_BC817_16_1' connected to [_Rbb#T_BC817_16_1,T_BC817_16_1]
WARNING: Transient: inserted virtual resistance at node `_net1' connected to [_Rc#T_BC817_16_1,Cp1,T_BC817_16_1,RfL1]
WARNING: Transient: inserted virtual resistance at node `_collector#T_BC817_16_1' connected to [_Rc#T_BC817_16_1,T_BC817_16_1]
WARNING: Transient: inserted virtual resistance at node `_emitter#T_BC817_16_1' connected to [_Re#T_BC817_16_1,T_BC817_16_1]
ERROR: Transient: Jacobian singular at t = 2.879e-04, aborting transient analysis
guitorri commented 10 years ago

The above error is on Mac 10.9, 64bit (latest master). The same example works unmodified with qucs-0.0.18.140410.exe (32bit?), on Windows 7.