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Old 19th August 2011, 12:40 PM   #1
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Default 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
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Old 20th August 2011, 07:32 PM   #2
BrianL is offline BrianL  United States
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Interesting, and very good for such tiny units. However, close-in phase noise is not as good as ovenized oscillators.
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Old 20th August 2011, 07:54 PM   #3
tomchr is online now tomchr  Canada
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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
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Old 21st August 2011, 10:57 PM   #4
BrianL is offline BrianL  United States
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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.
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Old 22nd August 2011, 01:43 PM   #5
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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
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Old 22nd August 2011, 02:14 PM   #6
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Try to order 11.2896 MHz....
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Old 25th August 2011, 04:52 AM   #7
BrianL is offline BrianL  United States
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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.
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Old 25th August 2011, 07:16 AM   #8
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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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