open-source-silicon.dev

Does anyone know where can I find the ngspice channel? I meet some problems when using ngspice.

there is none. you can ask in this channel or maybe <#C017P3RAD42|xschem>

Also <#C016HUV935L|analog-design> is a good place to ask about ngspice.

OK, thank you! When I run the post-simulation for my circuit in ngspice, it will need too long time, So do you have any ways to speed it up? I have been waiting 2 hours for the simulation.

<@U03839Z8D28> what kind of post layout extraction are you using? if RC extraction is used (every net replaced by a  RC equivalent network) simulatin can get very slow. Usually you have to set a threshold such that parasitic-capacitance-only extraction is done on smaller nets. What is the size of your circuit?

<@U03839Z8D28>  it's important to follow these instructions for decent performance <http://ngspice.sourceforge.net/applic.html#sky|http://ngspice.sourceforge.net/applic.html#sky>

The size is 1.7mm * 1.3mm, Actually, I have only just extracted the C as parasitic.

OK, let me see the instruction, thank you, Stefan and Eric!

<@U025WQVVA75> <@U0169AQ41L6>, Hi Eric, Is this meaning I need to create a .spiceinit in my HOME PATH, then install it again, or just create it in my home directory? Do I need to write them into my spice file? Because I have tried to write a .spiceinit file in my home path and run the ngspice, but it seems not to work. I set the num_threads =60, but according to the CPU monitor, there isn't an increased workload in the CPU running. So how can I set it rightly?

isnt it supposed to be in a directory from which you are running the ngspice?

<@U03839Z8D28>  You have a couple of options to load an init file.  see: <http://ngspice.sourceforge.net/docs/ngspice-html-manual/manual.xhtml#magicparlabel-22760>