Original Question: Noise analysis by Tarzan
I want to analyse output noise performance and I think Total Noise(RMS) vs frequency graphs is very useful.
Please show me the way to get the Total Noise graph over frequency like the attached file.
I think other spice simulator can generate this kind of graph.
Verified Answer: RE: Noise analysis by ezadminThis question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.
Question: RE: Noise analysis by JinoL
Do these steps.
Simulator >> Choose Analysis >> Noise >>Check 'Noise' for the Analysis Mode>>Ok
Run(F9) >> Probe AC/Noise >>Plot Input Noise (or Plot Output Noise).
With this given schematic:
You should be expecting this graph.
Question: RE: Noise analysis by Tarzan
Thanks for your reply.
I already got the graph you mentioned.
However it would be great if the ADISim PE simulate the total noise(Vrms) over frequency(Hz).
Question: RE: Noise analysis by ScottH
All SPICE engines that I have used allow integrals. It's normally an s() function, but it's called integ() in ADIsimPE.
Try this in ADIsimPE:
Plot the output noise, set the y-axis to linear (right click on graph > Axes > Edit Axis > Y-Axis > Lin), then on the schematic window, go to Probe > Add Curve > And enter the following equation for Y: sqrt(integ(onoise^2))
You should get a curve like the following, which is the integrated rms output noise vs frequency:
There's also some good info in MS-2066.
I hope this helps.