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hello does anyone know how I can do a mixed signal simulation in xschem?

So you want to include digital blocks in an analog circuit? If you have an extracted spice netlist of the digital circuit, you can create a symbol from that in xschem, I think.

<@U03CSQTGFM2> Please keep in mind that xschem is a schematic entry tool. NGSPICE does support mixed signal simulations. We demonstrated that in our PLL design here; <https://github.com/mabrains/PLL_design|https://github.com/mabrains/PLL_design>

You could use xschem to create symbols and use the macro models in NGSPICE 

<https://xschem.sourceforge.io/stefan/xschem_man/xschem_man.html|https://xschem.sourceforge.io/stefan/xschem_man/xschem_man.html>

This is the Tutorial for xschem. In the links above you could find an example usage of macro models in NGSPICE 

What is Linen?