Alitum SPICE noise analysis

[tonyh88]

Hello,

I'm checking out the Spice simulator in Altium latest version 23.6.0 and testing some functionalities. So far I've been pretty much able to do a lot of the usual simulation I would usually run in LT spice.

Not always user friendly but it works. However what I can't figure out is how to perform ac noise analysis. No matter how simple the circuit is, the simulation noise spectral density and integrated noise tabs that  pop up are always empty. See attached screenshots

I'm probably doing something wrong but Altium doesn't provide any example for noise analysis anywhere that I could find for newer versions. Maybe this feature is broken who knows.

If anyone has experience or can try it out please let me know

Thanks

[tonyh88]

For information I also tried both a DC and an AC voltage source for the noise source input doesn't make a difference.

I also tried running the same exact same thing as in an older version documentation without any luck : https://techdocs.altium.com/display/AMSE/Noise+Analysis

Edit: Just realized In the above screenshot the noise source selected is wrong as I was trying a bunch of stuff but even with the correct source (V2) there is no noise analysis output

[tonyh88]

Finally figured it out. Leaving this here if anyone ever struggles with this.

 The noise analysis completes successfully and both the integrated and spectral density tab open up automatically but after that you need to manually add the "onoise_spectrum" wave to the plot inside the Noise Spectral density. Same process for the integrated noise tab.

The "sim_data" panel is your friend a displays the available simulation waveform for each tab