@Stefan Schippers Is there a way to include an external file into the netlist by xschem? Not with a

.include

(this I know how to do), but a mechanism that xschem puts the file contents directly into the resulting netlist?

@Harald Pretl The following image shows an instance of an opamp in a schematic (above) and the symbol (in another xschem window) with its attributes. The following attribute in the symbol:

spice_sym_def="tcleval([read_data_nonewline [abs_sym_path comp_65nm_read.cir]])"

will read the file

comp_65nm_read.cir

looking in the xschem search paths. the

read_data_nonewline

will read the file into the netlist (with no additional newline added 🙂 ), the

abs_sym_path

builds the absolute path of the given file name looking for a match (the 1st found) in the search paths, This is more portable than specifying the absolute path of the file. You can also use environment vars, like

spice_sym_def="tcleval([read_data_nonewline $env(HOME)/comp_65nm_read.cir])"

The

comp_65nm_read.cir

file is the description of the subcircuit:

* comp_65nm_read.cir

.subckt comp_65nm_read PLUS OUT MINUS
v1 x 0 1.1
e1 out x plus minus 0.5
.ends

Super, exactly what I need… will try that.