@Stefan Schippers @Tim Edwards @mehdi Hello! I have RC extracted spice file which I am trying to simulate. While doing transient analysis I am getting time step too small error from ngspice. I tried changing rise time and fall time of clock but the error still persists I also tried to lower the time step still the error is showing up. I have used .option RSHUNT=1e20 to deal with floating nodes. How can resolve the timestep error. Here's the spice file for same.

Please provide a tb and a log file @Pranav Lulu

Here's the testbench