Plot Phase Noise Measurement

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Luis Vallejo Castro 2018-8-30

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https://ww2.mathworks.cn/matlabcentral/answers/416836-plot-phase-noise-measurement

评论： naheeda reshi 2023-5-10

Hi,

I want to plot the Phase Noise Measurement. The measurement is got by a Electrical Spectrum Analyzer, which gives a CSV file with power and frequency values. I want to use the Leeson phase noise formula(is there any method?): L(f)=Pn(dBm/Hz)-Ps(dBm)-10log(RBW)

I am not sure if my code is correct. By the way, I would like to get a graph like what I attach. x-axis is frequency offset, that is, the frequency between fo and fm. y-axis is phse noise.

The span frequency is usually 2MHz. My graph starts at 2*10^3 Hz and it should start at 10^0 Hz.....

I attach MatLab file and csv file.

Thank you

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Luis Vallejo Castro 2018-9-7

Hi,

I upload the formulas. Ps(dBm) is the carrier power while Pn(dBm/Hz) is noise power. I substract 10log(RBW) to normalized the measurement.

I get a measurement like the photo. It usually has 2MHz Span, so the offset could be between 0 and 1MHz. The measured file is csv with a colum and row (frequency and power). I find out the Ps and I figure out L(f) as the formula, that is, shifting to the right.