I have a similar problem --- simply using the (BJT based) 741 model in the library, doing a buffer with it, and trying a dc polarization will fail.
It seems that complex nonlinearities make QUCS barf very easily.
Anyone here that can help?
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hum...
For the first issue raised in 2007 by noachr.
If you add a DC simulation and avoid the 0Hz in the frequency sweep... I think it works. I did not calculate the 3dB pole... but the low pass behavior is there. (attached schematic)
I am not familiar with the "Mu-Amp", what is the expected behavior? From the DC analysis are the JFET properbly biased? Maybe the 2N3684 parameters are wrong??
I am trying to test the frequency response of a simple opamp circuit with an ac simulation. However, when I run it I get:
checker error, a .DC action is required for this circuit definition (accounted 1 non-linearities)
Any help would be appreciated.
Here is the schematic:
<Qucs Schematic 0.0.12>
<Properties>
<View=0,0,944,1094,1,0,120>
<Grid=10,10,1>
<DataSet=opamp.dat>
<DataDisplay=opamp.dpl>
<OpenDisplay=1>
<showFrame=0>
<FrameText0=Title>
<FrameText1=Drawn By:>
<FrameText2=Date:>
<FrameText3=Revision:>
</Properties>
<Symbol>
</Symbol>
<Components>
<GND * 1 460 370 0 0 0 3>
<R R2 1 380 570 -26 15 0 0 "1 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
<GND * 1 290 570 0 0 0 3>
<Vac V3 1 320 570 -26 18 0 0 "3 V" 1 "1 kHz" 0 "0" 0 "0" 0>
<.AC AC1 1 140 770 0 46 0 0 "lin" 1 "0 Hz" 1 "50 kHz" 1 "1000" 1 "no" 0>
<OpAmp OP2 1 490 390 -26 42 0 0 "1e6" 1 "15 V" 0>
<R R1 1 520 570 -26 15 0 0 "5 kOhm" 1 "26.85" 0 "0.0" 0 "0.0" 0 "26.85" 0 "US" 0>
<C C1 1 520 660 -26 17 0 0 ".1 uF" 1 "" 0 "neutral" 0>
</Components>
<Wires>
<410 570 460 570 "" 0 0 0 "">
<590 390 590 570 "" 0 0 0 "">
<530 390 590 390 "" 0 0 0 "">
<460 410 460 570 "" 0 0 0 "">
<550 570 590 570 "" 0 0 0 "">
<460 570 490 570 "" 0 0 0 "">
<590 570 590 660 "" 0 0 0 "">
<550 660 590 660 "" 0 0 0 "">
<460 570 460 660 "" 0 0 0 "">
<460 660 490 660 "" 0 0 0 "">
<350 570 350 570 "Vin" 370 520 0 "">
<590 390 590 390 "Vout" 620 360 0 "">
</Wires>
<Diagrams>
</Diagrams>
<Paintings>
</Paintings>
Hi there!
Put an DC simulation into the schematic.
Hope this helps, Stefan.
I also have this error in my circuit. I am disappointed because Qucs looks like a great and intuitive program.
I was hoping to simulate an "Mu-Amp" FET tube-emulator, for which I want to test AC.
I tried adding a DC simulation; the output I have looks only like flatlined DC. Something seems broken.
Any help would be...helpful. Thanks : )
My Error: checker error, a .DC action is required for this circuit definition (accounted 2 non-linearities)
My System: Windows 7/64Bit
My Qucs 0.0.17
My Schematic version without adding DC simulation:
Last edit: BrendaEM 2014-02-28
I have a similar problem --- simply using the (BJT based) 741 model in the library, doing a buffer with it, and trying a dc polarization will fail.
It seems that complex nonlinearities make QUCS barf very easily.
Anyone here that can help?
Romano, thanks for chiming in.
I posted a bug report here: https://sourceforge.net/p/qucs/bugs/146/
If you want to add to that, it may help. Thank you.
Last edit: BrendaEM 2014-02-28
Hum...
For the first issue raised in 2007 by noachr.
If you add a DC simulation and avoid the 0Hz in the frequency sweep... I think it works. I did not calculate the 3dB pole... but the low pass behavior is there. (attached schematic)
I am not familiar with the "Mu-Amp", what is the expected behavior? From the DC analysis are the JFET properbly biased? Maybe the 2N3684 parameters are wrong??