thank you Sean. I work every day with Oscilltors and your info of phase noise is very clear. please continue more on RF, Oscillators, Phase Noise, Jitter, PLL, Feedback System etc...
Thanks Bunya! Great to hear you found this helpful. We also have a lot of great resources on RF, phase noise, oscillators, etc. on our blog! Consider checking it out www.blog.bliley.com
Sean Fedorko Thank you for your video. I just have question that if the phase noise is the area under the curve, why does it have negative value? And if it is more negative, what does it mean (ie, oscillator is worse or better)?
When you talked about Oscillator, what exactly is the signal? And what's the signal you talked about when you said "The signal would be vertical line" Thank you.
Hi there! Thanks for your questions. We were referring to oscillators in general, so not an oscillator at a specific frequency (doesn't matter in this case). As for vertical line, we mean that it's ideal for an oscillator to operate at 1 very specific frequency over time (one vertical line on the graph. However, this is never the case and oscillators will always have some sort of other noise (phase noise) present. A main part of the oscillator's job is to minimize this phase noise. Hope this helps!
To measure a specific frequency at the ideal phase noiseless signal, you will still have a skirt as the measurement device will also have a bandwidth that would need to be considered and would be seen as a "measurement noise floor". As the spectrum analyzer sweeps towards the carrier frequency, the bandwidth of the receiver will start to register a signal and the skirt will be seen rising and falling as the sweep crosses the signal. The analyzer noise will also have noise that needs to be understood. To improve the measurement over a regular spectrum analyzer sweep, there's what's known as a quadrature lock between a known good reference and the device under test. Very accurate measurements can be seen at that point and a determination as to whether the device under test is worthy of the specification.
thank you Sean. I work every day with Oscilltors and your info of phase noise is very clear. please continue more on RF, Oscillators, Phase Noise, Jitter, PLL, Feedback System etc...
Thanks Bunya! Great to hear you found this helpful. We also have a lot of great resources on RF, phase noise, oscillators, etc. on our blog! Consider checking it out www.blog.bliley.com
Straight forward and to the point. Awesome job, looking forward to additional videos in the series.
Thanks, David! Glad you enjoyed. See you back here for they next one! :)
Thanks for sharing this video. It was a very crisp and clear explanation of phase noise.
Thanks Ahmad! Great to hear you found it helpful.
Awesome video and an excellent support material available in the description
Beyond excited for this series...
WOO!!
Great video
Thank you!
"Do you wanna hear the first sound ever recorded?"'
Me: "No, not rea--..."
*literal sounds form hell*
Yeah... definitely no music to the ears, that's for sure.
Very informative!
Thanks! ...Just wait until you see the next episode!
Thank you! :)
If you ever have questions about the tech we explain on the show, hit up @BlileyTech on Twitter, or me at @SeanFedorko!
Sean Fedorko
Thank you for your video. I just have question that if the phase noise is the area under the curve, why does it have negative value? And if it is more negative, what does it mean (ie, oscillator is worse or better)?
what are the condition to obtain low phase noise for oscillator?
When you talked about Oscillator, what exactly is the signal?
And what's the signal you talked about when you said "The signal would be vertical line"
Thank you.
Hi there! Thanks for your questions. We were referring to oscillators in general, so not an oscillator at a specific frequency (doesn't matter in this case). As for vertical line, we mean that it's ideal for an oscillator to operate at 1 very specific frequency over time (one vertical line on the graph. However, this is never the case and oscillators will always have some sort of other noise (phase noise) present. A main part of the oscillator's job is to minimize this phase noise. Hope this helps!
To measure a specific frequency at the ideal phase noiseless signal, you will still have a skirt as the measurement device will also have a bandwidth that would need to be considered and would be seen as a "measurement noise floor". As the spectrum analyzer sweeps towards the carrier frequency, the bandwidth of the receiver will start to register a signal and the skirt will be seen rising and falling as the sweep crosses the signal. The analyzer noise will also have noise that needs to be understood.
To improve the measurement over a regular spectrum analyzer sweep, there's what's known as a quadrature lock between a known good reference and the device under test. Very accurate measurements can be seen at that point and a determination as to whether the device under test is worthy of the specification.
What's more of a pain for you? Phase Noise or Frequency Instability? Let us know!