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Noise analysis of ADIsimPE

Original Question: Noise analysis by Tarzan

Hi there,

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.

Thanks

3426.attachments.zip

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.

Thank you,
EZ Admin
Question: RE: Noise analysis by JinoL

Hi,

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.

Regards.


Question: RE: Noise analysis by Tarzan

Hi Jino,

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).

Best regards,

Tarzan


Question: RE: Noise analysis by ScottH

Hi Tarzan,

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.

Best regards,

Scott

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