Understanding Phase Noise Fundamentals

This video provides a short introduction to phase noise, the effects of phase noise, and how phase noise is measured and analyzed.

Timeline:
00:00 Introduction
00:14 About oscillators
01:20 Ideal oscillator
01:54 Real oscillator
02:38 What is phase noise?
03:14 Common effects of phase noise
03:29 Review / refresher: mixing
04:15 Mixing and phase noise
04:33 Phase noise and spectral regrowth
05:10 Phase noise and reciprocal mixing
06:02 Phase noise and communications systems
06:46 Measuring and analyzing phase noise
08:02 Overview of the spectrum analyzer method
08:52 Single sideband (SSB) phase noise
09:33 Plotting SSB phase noise
10:15 Spot noise
10:55 Phase noise analyzer / cross-correlation
12:05 Additional phase noise-related measurements
12:57 Summary

[drewwollin]

The best video on phase noise. One thing not mentioned is that spectrum analysers can only be used to measure phase noise where the phase noise of the DUT is worse than the phase noise of the spectrum analyser. This is a problem for low-phase noise oscillators, hence the need for cross-correlation phase noise analysers.

[RADIOBUNKER]

Thank you for this amazing way to present in an easy way such technical information. Keep going !

[mab]

I can't thank you enough really!
Every time i search for something on the internet that i don't understand it that well, no matter how long I look, i always end in one of your videos!
Thank you alot!

[Albert-PhotonChem]

A big like to the video! And an even bigger thank you to their creators!!

[blackbriar]

A clear and concise presentation that I found it technically informative and easy to absorb as an introduction. Where do I find this short powerpoint presentation for future reference?

[yuniorgarcia]

Great video, very good resume of Phase Noise!!!

[letstalkscience]

A very technical topic explained beautifully and in an easy to understand manner!! Thankyou!!

[ArchanaSingh-pupo]

It was great to learn phase noise in a very simple and nice way. After lot of efforts finally i got this video, Its really great.

[mi_thiran]

Thanks for the excellent explanation. Loved it and was motivated to explore more..

[jtkim]

Great lecture! I am also waiting on Allan variance topic. Thanks!

[tydengr]

Perfect video, very easy to understand

[yasserothman]

@2:36 the 2nd plot may i know what the label of the y axis ? Is it Power ?

Also @2:36 2nd plot may I know mathematically how did the time changing phase cause spectral broadening in other words how did we get this skirt shape Vs Freq ?

@3:57 you mentioned that it is generally easier to work with less Freq signals, may I know why ?

[Ahmet_Yilmaz]

Thank you. Finally i understood clearly.

[quanvu]

thank you for this video, but I have a question. how much does the power of carrying wave? If i gain the power of carrying wave, phase noise will change or fix?

[Tom-dnde]

It's a great video. Thank you a lot! I also see the term "phase error" in the Specifications of R&S products, so what is the difference between "phase error" and "phase noise"?

[musraphaberkane]

Do you have a video about Alan variance?

[ernestb.]

Great, clear and to the point educational videos to get the basic understanding. One question if I may. Older spectrum analyzers do not go so low in RBW to 1Hz, nor have automated measurement of phase noise. When doing manual measurement with specific RBW (for example mine goes to 200Hz) do you divide the measured power (at some specific offset, like usual 10kHz) in dBm by 200 to get [dBm/Hz]? Thanks

[tienpham]

question, how to determine the phase noise signal level it good or bad. what the limit.

[PhillipFeldman]

What are the units of integrated phase noise?