Implementing custom symbol/component libraries

[georgtree]

Hello!
Question is simple - what is the right way to implement custom library with custom symbols, connected libraries and deep hierarchy in Qucs-S?
Where to find the format description (assume some XML ?), how properly create links to libraries, etc.
Thank you in advance.

[ra3xdh]

The procedure of the libraries creation is not documented. It is planned to include this in a new documentation. See #554 In a short words you should create a project containing subcircuits and the use Project->Create library menu entry. The take the library file from $HOME/.qucs/user_lib Wrap SPICE netlist in a subcircuit using spice netlist device. Don't use SpiceLibComp, because it will not embed the SPICE code in XML file. Normally you do not edit the XML yourself with the text editor. The full procedure of the library creation and XML syntax are beyond the scope of answer in github issue.

[ra3xdh]

@georgtree I am planning to publish an article about libraries creating at habr.com , but in Russian only. This upcoming article may explain this question. Please wait.

[georgtree]

Yeah it would be great, currently I am creating a large multi physical library (mechanical, magnetic, thermal, electrical etc) for XSCHEM, but would be cool to do it for Qucs-S. As a simulator ngspice is used together with xspice and verilog-a for models.

[ra3xdh]

Plese keep in mind that Qucs-S doesn't support embedding Verilog-A sources to the LIB file and automatic compilation. You should load OSDI files using SPICEINIT from toplevel schematic. The same for XSPICE CM modules.

[georgtree]

Yeah I wrote script to automatically compile all components sources

[tomhajjar]

@georgtree

Qucs-S will only allow lib names not already present in the main library folder and user_lib.

For clarity best to keep library and device names short. The internal labels are a combination of both.

Any missteps during the library creation process could cause issues. Best to delete the library and re-start. You can always add subcircuit descriptions later with a text editor so I deselect the choice.

Use the symbol files I created or "cut" symbols out of an existing library. All symbols in a lib use 0,0 as a central Datum.