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Low-distortion Audio-range Oscillator
Low-distortion Audio-range Oscillator
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Old 10th August 2019, 10:00 AM   #7481
suzyj is offline suzyj  Australia
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Originally Posted by triode_al View Post
research and disaster
They donít call it the bleeding edge for nothiní.
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Old 10th August 2019, 11:34 AM   #7482
triode_al is offline triode_al  Netherlands
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Originally Posted by suzyj View Post
They donít call it the bleeding edge for nothiní.
What is most disastrous in my work is the research and divert phenomenon, where I 'invent' something and being brought off track, to divert up to a point of no return and then drop the whole thing. Sorry, this is OT.
ņ la recherche d'un son perdu
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Old 10th August 2019, 01:33 PM   #7483
diyralf is offline diyralf
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I think it doesn't matter if the frequency or the amplitude changes.This audio oscillator is used for audio measurements. Distortions only matter.
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Old 10th August 2019, 06:36 PM   #7484
bozidarms is offline bozidarms  Switzerland
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How does it look 1kHz signal derived from 10MHz GPS.
Well, here is the answer:

first picture presented a change in frequency of 1kHz over time
GPS-derived 1kHz vs Time.png

and second is a histogram of same 1kHz signal
GPS-derived 1kHz Histogram.png

Signal vary less than 260u(micro)Hz, and whole frequency span is only 500uHz wide.
Signal shows exceptional spectral purity and stability.

Even more fascinating is histogram of 10Hz signal derived from same 10mHz GPS:
10hz derived from 10mHz gps.png

Note the frequency span of only 50n(nano)Hz and freq.variation is not more than 27nHz!

I apologize for those whose are not interested in this matter ,but i am just fascinated with measurements.

Last edited by bozidarms; 10th August 2019 at 06:42 PM.
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Old 11th August 2019, 12:15 AM   #7485
1audio is offline 1audio  United States
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Low-distortion Audio-range Oscillator
Actually in a sense frequency and amplitude changes are distortions. An RC network will not have enough Q to get the really narrow spectrum that a crystal oscillator can. However I'm not sure a tuning fork crystal would have the necessary Q either at 1 KHz.

I explored injection locking an oscillator but when I got it to lock the distortion shot up. The best approach might be what Boonton did with a PLL loop going into a tuning analog multiplier on the state variable. It works well but the analog multipliers are a limitation in overall performance. Still I get very good frequency stabilization and .01Hz resolution and accuracy with .0006% THD+N.
Demian Martin
Product Design Services
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Old 11th August 2019, 02:15 AM   #7486
anatech is offline anatech  Canada
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Low-distortion Audio-range Oscillator
Hi Demian,
I also tried injection locking an oscillator and ran into the same issues no matter what I did. I did not go as far as you did. It was clear that very low distortion and injection locking wasn't going to work well. Not for me anyway.

"Just because you can, doesn't mean you should" © my Wife
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