Some models from qucs-s library not getting "normalized" parameters, either generate unparsable netlist line, or lose scale value

[tvrusso]

I just attempted to use some of the LED models in the Qucs library in a Qucs-s schematic with Xyce. These models all have spaces in the diode parameters between value and units, and a 50 MOhm leakage resistor. The specific LED model I tried to use was the green one.

Qucs-s is generating a netlist that doesn't squeeze out the space between parameter and units of the diode parameters, resulting in a parse error from Xyce (which uses space as a field separator, like the original SPICE does). Further, the "50 MOhm" is not converted to "50 Meg" as it seems it should be by the use of "spicecompat::normalize_value" in the resistor.cpp code.

The attached schematic and the netlist it produces are in this tar file: led_prob.tar.gz

A quick glance at code makes it appear that when the parameter list for the diode is generated, nothing is calling "normalize_value". If I modify (by hand) the diode model in LEDs.lib to take out the spaces, that fixes the netlist so it runs. But the "50 MOhm" resistor becomes a 50 ohm resistor.

If I remove the space from the leakage resistor specifier in LEDs.lib, qucs-s emits "50MOhm" and not "50Meg".

But qucs/components/resistor.cpp does call spicecompat::normalize_value in its spice_netlist function, and still doesn't convert "50 MOhm" into "50Meg" as I would expect it to. I don't quite understand what's going wrong there.

[ra3xdh]

If the model contains subcircuit in original Qucs libraries, it is represented as Qucs netlist, but not as XML subcircuit. The spicecompat::normalize_value is invoked only for "normal" components. If Qucs-S finds Qucs netlist, it redirects it to qucs2spice processor (located at extsimkernels/qucs2spice.cpp) that will convert it to SPICE netlist. It is a simple Regexp-based netlist converter and some functions could be missing here. Probably qucs2spice would be benefit from redesign. So the Resistor::spice_netlist is not invoked for such library component.

[tvrusso]

Ah. Thanks for clarifying where I should look. I'll look at qucs2spice.cpp soon.

[ra3xdh]

LEDs library has been fixed by #134. I have also provided some other new libraries that have better compatibility with SPICE. Qucsator netlist syntax should be removed from libraries and SPICE entries provided instead. I am considering the update of ideal devices libraries #258 This issue could be closed.