Qucs Triangle Wave Example won't work Qucs-S

[tomhajjar]

I have been having issues making I/V Triangle sub-circuits that work in ngspice and qucsator-rf.

1. netlist created for "Triangle_i_tran.sch" has an extraneous "-1" that causes ngspice errors. I flipped polarity of I1 and "-1" is still there. Send netlist to DuSpice after deleting -1 and simulation runs but data is garbage. This may effect Waveform/Source Library #1046

2. I went back to Qucs 0.0.20 and "Triangle_Wave_Generator.sch" works. Try Triangle_Wave_Generator.sch in Qucs-S, qucsator-rf and it has multiple errors. Ideal Rectangular Current Sources doesn't work in qucsator-rf

Waveforms_prj.zip

[ra3xdh]

The irect simulation error fixed by #1059. The triangle wave simulation example works on my machine.

[tomhajjar]

Have you updated the "nightly"? The latest from 35min ago hasn't fixed issues...

[ra3xdh]

Everything should be updated automatically. The latest build from current branch works as expected.

[ra3xdh]

Use the continuous release from 18:18UTC

[tomhajjar]

There is still 2 issues.

I created two projects, Waveforms_prj for ngspice and Waveforms_qucs_prj for qucsator-rf.

The Qucs Ideal Rectangular Current Source and Ideal Rectangular Voltage are treated differently by Qucs-S when used in ngspice versus qucsator-rf. The "re-mapping" of the Qucs source parameters to work in ngspice is VERY different BUT the mapping is logical.

However the Qucs Ideal Rectangular V/I Source parameters are misleading. The Qucs Ideal Rectangular Sources are "unique" in that TH includes Tr and TL includes Tf. In Qucs to make a Triangle, TH=Tr and TL=Tf. That is not the case when these parameters are "re-mapped" by Qucs-S to work in ngspice.

Qucsator wants TH=Tr=1ms and TL=Tf =1ms for a 2ms Triangle

ngspice wants TH=TL =1ps Tr=Tr=1ms for a 2ms Triangle

So basically old Qucs schematics using Ideal Rectangular Sources MAY need their source parameters changed when ported over to ngspice.

The last issue is sub-circuits made using the Qucs Ideal Rectangular Current Source don't work in ngspice but sub-circuits made using the Qucs Ideal Rectangular Voltage Source DO work in ngspice. Maybe it's the parameters I used in the sub-circuit or there is a bug. See "Triangle_i_sub_tran.sch". The file "Triangle_i_tran.sch" which is the same analysis without using a sub-circuit works...

As stated above, there is an "-" in the source entry 2nd position in the netlist, (V2 pulse value). What is it's purpose?

Waveforms.zip