08/24/2021, 5:10 PM
@User Short answer: you can't. Long answer: ngspice has experimental transient noise simulation you could try and then apply some post processing. Another free (as in beer) option is to use the PAN simulator from which has some powerful features including pnoise but some self assembly is required
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Vinodhini G Edward

08/26/2021, 3:19 PM
@yrrapt Thank you sir. I have installed PAN simulator. I could run the example files given using diode models. I tried copying the netlist generated by xschem and expanded by ngspice for a simple inverter. I have changed few parameters to satisfy PAN simulator syntax. But i am still not able to run the simulations. I have attached the netlist. can you please let me know where I am going wrong.
Also please let me know if there any other way to link the netlist generated by xschem with PAN simulator.

Rahul Bharadwaj

09/05/2021, 12:40 PM
@yrrapt Could you please let me know how to do transient noise simulations in ngspice? I have done my simulations using the open source PDK (Sky130nm) which has noise files included in it. From the Ngspice manual I could find example transient noise simulations with only external noise source being included. I have also gone through other Ngspice forum links related to this but couldn't understand the procedure clearly. Kindly help.