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[Editorial]
The Quest For Low Phase Noise

Jack Browne  |  ED Online ID #22221 |  December 3, 2009

Phase noise can degrade the performance of the most sophisticated wireless communications system, especially when it is based on digital modulation. It is no surprise, then, that the best paper award for a nominal measurement conference, the November ARMMS Conference (www.armms.org), should go to a presentation on achieving lower phase noise with a frequency synthesizer using a voltage-controlled oscillator (VCO). The recognition went to Alexander Chenakin of Phase Matrix, Inc., who explained how to cut phase noise for a VCO even when multiplying its frequencies.

Chenakin, interviewed earlier this year in Microwaves & RF, reported on low phase noise of -122 dBc/Hz offset 10 kHz from a 10-GHz carrier. Normally, a YIG oscillator is needed for such low-noise performance. But this design was based on a VCO, with its inherently faster (than a YIG) tuning speed. The low-phase-noise results for the VCO-based synthesizer, of course, support a wide range of test equipment, including spectrum analyzers and signal generators, not to mention all those digitally modulated wireless communications systems.








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Reader Comments

Although Mr. Browne's article doesn't have the full link to the complete text, the information is useful. The full link is at http://www.phasematrix.com/pages/Articles.html . There are some nice plots showing the phase noise improvements that are well over 20dB compared to conventional, PLL technology. There is a lot of good information here.

Anthony Estrada -December 13, 2009   (Article Rating: )

For a copy of the full paper please visit:

http://www.phasematrix.com/Articles/ARMMS_Nov09_Chenakin_Phasematrix.pdf

apskhanna -December 11, 2009

mo useful info

HY -December 07, 2009   (Article Rating: )

Hmm, multiplying up any oscillator (xtal, YIG, VCO or whatever) will generally spread the close-in phase noise. Is this clever, magic or what, exactly?

Anonymous -December 07, 2009   (Article Rating: )

We might believe the results if there was any information that supported them.

Donald Delzer -December 07, 2009   (Article Rating: )

Written to occupy space?

Anonymous -December 07, 2009   (Article Rating: )

no article,since no information

Anonymous -December 04, 2009   (Article Rating: )

An empty emptiness

Anonymous -December 04, 2009   (Article Rating: )

Please post the article!

Jim Muehlberg - NRAO -December 04, 2009   (Article Rating: )

Please tell us why you bothered writing this. I used to think of MW&RF as being useful, but this isn't worth the electrons it's written with. One more article like this and MW&RF is going on my email "junk" status.

Anonymous -December 04, 2009   (Article Rating: )

Rating = 0

Where is the useful information?

Anonymous -December 04, 2009

You have got to do better than this

Anonymous -December 04, 2009   (Article Rating: )

Is this an article? Uesless info!

Anonymous -December 04, 2009   (Article Rating: )

What is all about? Where is the news?

arik_123 -December 04, 2009   (Article Rating: )

Where is the technical content?

Anonymous -December 04, 2009   (Article Rating: )

There's more information in the graffiti on the bathroom wall than in this abstract...

Anonymous -December 04, 2009

The abstract is okay but it looks like you forgot the article on the posting. I am familiar with Phase Matrix but the article doesn't even show how they applied the technology to this oscillator and also if it is tune or fixed frequency. Hope there is another posting with the rest

Anonymous -December 04, 2009   (Article Rating: )

Big Claims - Where's the Beef?

Anonymous -December 03, 2009

Great Abstract but useless

Anonymous -December 03, 2009

where can i get more details.

Anonymous -December 03, 2009

Absolutely no information given.

Anonymous -December 03, 2009   (Article Rating: )

No useful information given.

Anonymous -December 03, 2009   (Article Rating: )