@Matt Venn, @Stefan Schippers I have installed ngspice-42. I am trying to run digital simulation on ngpice I am getting below error on running: ngspice vlnggen top.v Error: sh: 1: verilator: not found Current directory: /home/deepak/workspace/SRAM_MPW7_testing/Testings/digital_openlane run/src/top_obj_dir com_fopen() cannot open Vlng.h: No such file or directory ngspice-42 done I tried reinstalling ngspice-42 to verify if this file is missed during installation , it is showing same error still.

I think ngspice uses the verilog simulator called "verilator" to handle simulation of verilog code. So you may try to install verilator. However I am not very expert in verilog mixed mode simulation with ngspice.

yes it uses verilator. Let me check once installing that as well.

@Deepak I am sorry I have not tried this, so I can not help here 😞 Try to post the question to #analog-design.