I am getting fatal error related to model while trying to simulate inverter netlist. Please suggest what could be the issue ?

@vks please send the

inverter_tb.spice

file. The error can be related to wrong sizing or something else. Difficult to investigate without the circuit netlist.

@Stefan Schippers Thanks for your response. Netlist is attached.

@vks after changing the .lib line to point to my installation your example works perfectly. I see you are including the .lib file from

/home/vipul/open_pdks

. Is this the directory you cloned with git? This is in general wrong. After building open_pdks with

make

you need to transfer all the files to the final install location with

sudo make install

. Usually the install location is

/usr/local/share/pdk

. What is the ngspice version you are using? Did you create a

.spiceinit

file in the same direcctory where tb_inverter.spice is generated, containing the following lines?

set ngbehavior=hsa
set ng_nomodcheck

Thanks Stefan, after changing model path to /*usr/local/share/pdk* simulation is running succesfully. I had done all the steps as mentioned in your last reply but was taking model path from directory cloned from git. After changing it to correct path issue with simulation is gone. Thanks once again.