How to create a logarithmic chart plot to represent phase noise results

Eric J.
APPLETON, WI

Feb 19, 2025
4 Posts

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Re: How to create a logarithmic chart plot to represent phase noise results

I have data back from a spectrum analyzer that represents the phase noise from a signal source.  The data is the magnitude data and comes back as x number of points across decades of frequencies.  This particular example is 195 points from 10Hz to 100MHz.

In Excel I can recreate the plot using a scatter plot type chart where I pass in the X and Y components.  I can recreate the frequency logarithmically with a formula that disperses the 195 points across the 10Hz to 100MHz range.

So far with ATEasy, I have not been able to find a way to provide X,Y pairs and have them plotted.  

I understand that there is a log scale option for the x axis, but I don't know to provide it my 195 points.


File Attachment:
 PhaseNoisePlot_linear.png

Eric J.
APPLETON, WI

Feb 19, 2025
4 Posts

0 ✔  |  ✗ 0  

Re: How to create a logarithmic chart plot to represent phase noise results

Attaching result with log scale selected.


File Attachment:
 PhaseNoisePlot_log.png

DrATEasy (Ron Y.)
Mission Viejo, CA

Feb 20, 2025
374 Posts

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Re: How to create a logarithmic chart plot to represent phase noise results

Hi,

Not sure what chart you are expecting to see. Can you provide a sample of the chart you are expecting to see from excel?

According to your screenshot of ATEasy logarithmic plot, most of the noise signals were active at frequencies around 100Hz, instead of using fixed axis’s range of 1-100MHz, you could zoom into active frequencies only by setting X-Axis.AutoScale=True and Plot.AutoScale=True.

Ronnie



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