New Ultra Low Phase Noise Oscillator from Crystek

wktk_smile · 19th August 2011, 01:40 PM

Ultra-low phase noise CMOS oscillator provides 168-dBc/Hz noise floor - Electronics Eetimes

Here's CCHD-575 datasheet
http://www.crystek.com/crystal/spec-...k/CCHD-575.pdf

They also have CCHD-957 ultra-low phase noise oscillator with
standby Mode as a new product.
http://www.crystek.com/crystal/spec-...k/CCHD-957.pdf

BrianL · 20th August 2011, 08:32 PM

Interesting, and very good for such tiny units. However, close-in phase noise is not as good as ovenized oscillators.

tomchr · 20th August 2011, 08:54 PM

Still -100 dBc/Hz at 10 Hz offset is DAMN IMPRESSIVE! That's hard to do, actually. Yes, I've designed XO's in silicon that had similar performance. I know what it takes.

~Tom

BrianL · 21st August 2011, 11:57 PM

Yes, it is impressive, especially for the physical and probably 'low' cost (vs. things that are better like ovenized oscillators, rubidium references, and GPS-disciplined versions of the previous two). However, close-in phase noise is no better than other Crystek units like the CCHD-950 series. Still every little bit helps, I'm sure. I don't yet see them at any of the distributors; it'll be interesting to see the price.

The old reliable HP10811 has -130dBc at 10Hz offset. Unfortunately, you'd loose some of that in a PLL multiplying it up to higher frequencies needed for digital audio.

davidsrsb · 22nd August 2011, 02:43 PM

Oven oscillators do not have low phase noise. They are designed for excellent high stability, a different problem. If anything they should have worse noise due to the higher temperature

QSerraTico_Tico · 22nd August 2011, 03:14 PM

Try to order 11.2896 MHz....

BrianL · 25th August 2011, 05:52 AM

David,

Read the spec sheet for the HP 10811 family or the Stanford Research rubidium frequency reference, or various other ovenized oscillators. The do have low phase noise and as far as I know, phase noise is not inherently a function of operating temperature within reason. As 'Tico' points out, ovenized don't come in convenient frequencies for audio. Some pro audio equipment or even high-end (DCS) equipment can take a 10MHz external reference, but you or I will need some sort of PLL setup to create audio-required frequencies and that may negate the benefits of the initial low phase noise.

davidsrsb · 25th August 2011, 08:16 AM

Interesting, the old HP is a bit special. Even spec on the effects of gravity and magnetic field!
http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf
and internal pictures Inside the HP 10811 Dual Oven

Much better than the oscillators I used in the past.

19th August 2011, 01:40 PM	#1
wktk_smile diyAudio Member Join Date: Dec 2009 Location: Kyoto	New Ultra Low Phase Noise Oscillator from Crystek Ultra-low phase noise CMOS oscillator provides 168-dBc/Hz noise floor - Electronics Eetimes Here's CCHD-575 datasheet http://www.crystek.com/crystal/spec-...k/CCHD-575.pdf They also have CCHD-957 ultra-low phase noise oscillator with standby Mode as a new product. http://www.crystek.com/crystal/spec-...k/CCHD-957.pdf

20th August 2011, 08:32 PM	#2
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	Interesting, and very good for such tiny units. However, close-in phase noise is not as good as ovenized oscillators. __________________ bel

21st August 2011, 11:57 PM	#4
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	Yes, it is impressive, especially for the physical and probably 'low' cost (vs. things that are better like ovenized oscillators, rubidium references, and GPS-disciplined versions of the previous two). However, close-in phase noise is no better than other Crystek units like the CCHD-950 series. Still every little bit helps, I'm sure. I don't yet see them at any of the distributors; it'll be interesting to see the price. The old reliable HP10811 has -130dBc at 10Hz offset. Unfortunately, you'd loose some of that in a PLL multiplying it up to higher frequencies needed for digital audio. __________________ bel

25th August 2011, 05:52 AM	#7
BrianL diyAudio Member Join Date: Mar 2002 Location: USA	David, Read the spec sheet for the HP 10811 family or the Stanford Research rubidium frequency reference, or various other ovenized oscillators. The do have low phase noise and as far as I know, phase noise is not inherently a function of operating temperature within reason. As 'Tico' points out, ovenized don't come in convenient frequencies for audio. Some pro audio equipment or even high-end (DCS) equipment can take a 10MHz external reference, but you or I will need some sort of PLL setup to create audio-required frequencies and that may negate the benefits of the initial low phase noise. __________________ bel

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20th August 2011, 08:54 PM	#3
tomchr diyAudio Member Join Date: Feb 2009 Location: Calgary	Still -100 dBc/Hz at 10 Hz offset is DAMN IMPRESSIVE! That's hard to do, actually. Yes, I've designed XO's in silicon that had similar performance. I know what it takes. ~Tom

22nd August 2011, 02:43 PM	#5
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	Oven oscillators do not have low phase noise. They are designed for excellent high stability, a different problem. If anything they should have worse noise due to the higher temperature

22nd August 2011, 03:14 PM	#6
QSerraTico_Tico diyAudio Member Join Date: Oct 2004	Try to order 11.2896 MHz....

25th August 2011, 08:16 AM	#8
davidsrsb diyAudio Member Join Date: Dec 2005 Location: Kuala Lumpur	Interesting, the old HP is a bit special. Even spec on the effects of gravity and magnetic field! http://www.hparchive.com/Manuals/HP-10811AB-Manual.pdf and internal pictures Inside the HP 10811 Dual Oven Much better than the oscillators I used in the past.

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