New simulator in KiCad failed plot transient analysis


#1

Hey Guys,
I am new to KiCad simulation, which they have introduced in their nightly build. When I tried to do a transient analysis on a low pass filter, simulator shows some error. I dont know whats the error actually mean ?? Any thoughts ??

lowpass

Circuit: KiCad schematic
Background thread stopped with timeout = 0
Doing analysis at TEMP = 27.000000 and TNOM = 27.000000
Warning: singular matrix:  check nodes vin and vin
Note: Starting dynamic gmin stepping
Trying gmin =  1.0000E-003 Note: One successful gmin step
Trying gmin =  1.0000E-004 Note: One successful gmin step
Trying gmin =  1.0000E-005 Note: One successful gmin step
Trying gmin =  1.0000E-006 Note: One successful gmin step
Trying gmin =  1.0000E-007 Note: One successful gmin step
Trying gmin =  1.0000E-008 Note: One successful gmin step
Trying gmin =  1.0000E-009 Note: One successful gmin step
Trying gmin =  1.0000E-010 Note: One successful gmin step
Trying gmin =  1.0000E-011 Note: One successful gmin step
Trying gmin =  1.0000E-012 Note: One successful gmin step
Trying gmin =  1.0000E-012 Note: One successful gmin step
Warning: singular matrix:  check nodes vin and vin
Warning: Dynamic gmin stepping failed
Note: Starting source stepping
Supplies reduced to   0.0000% Warning: singular matrix:  check nodes vin and vin
Trying gmin =  1.0000E-002 Note: One successful gmin step
Trying gmin =  1.0000E-003 Note: One successful gmin step
Trying gmin =  1.0000E-004 Note: One successful gmin step
Trying gmin =  1.0000E-005 Note: One successful gmin step
Trying gmin =  1.0000E-006 Note: One successful gmin step
Trying gmin =  1.0000E-007 Note: One successful gmin step
Trying gmin =  1.0000E-008 Note: One successful gmin step
Trying gmin =  1.0000E-009 Note: One successful gmin step
Trying gmin =  1.0000E-010 Note: One successful gmin step
Trying gmin =  1.0000E-011 Note: One successful gmin step
Trying gmin =  1.0000E-012 Note: One successful gmin step
Note: One successful source step
Supplies reduced to   0.1000% Warning: singular matrix:  check nodes vin and vin
Supplies reduced to   0.0000% Warning: singular matrix:  check nodes vin and vin
Warning: source stepping failed
Transient solution failed -
Last Node Voltages

#2

I have not familiar Kicad simulator. But the output looks similar to spice. I think their is some problem with the AC supply in your circuit. I think, It should have two terminals with one terminal connected to ground. Can you find any other AC supply with two terminals, in Kicad??


#3

Thanks for the replay. There isn’t any other AC Symbols in list.


#4

Have you tried to change the spice settings ( Voltage, frequency…etc ) for that particular ac symbol in you schematics ?? If not, try and report us back!!


#5

Yes, changed the voltage, frequency etc for the ac symbol, but no change yet…still same error!! :weary::tired_face:


#6

Hello, you have to find a new ac symbol as mentioned by @EEngineer. Just like this,

After that, make schematics like this,
Screenshot%20from%202018-06-11%2022-32-55

For your circuit, the cut off frequency will be 16 Hz, if you feed 100 hz to spice settings in new ac supply the final plot look like this,

Regards!


#7

Thank you so much @Mr.Tesla. You have solved heck of my problem.