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Re: butler crystal oscillator 5th overtone
Hi,
look at https://by-rutgers.nl/PDFiles/Reproducible%20Low%20Noise%20Oscillators.pdf
At the end the Xtal oscillator has been treated.
73 de Herbert.
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On this thread I have read that FETs should only be used below about 100 MHz. At 10 MHz a FET should be better than a BJT. Is this correct? You all seem to have the information I'm looking for....
BTW, don't say that anyone can build a good oscillator at 11 MHz... This is less simple as it seems...
This is what I mean. My FET-oscillator (with 7 components) is only 10 dB worse than the rather complicated one of Ulrich.
BTW I know the theory already for about 50 years.....;-)
Regards,
Herb.
Oh, I'm sorry, but if I look at the curves in Ulrich's oscillator on 155 MHz and compare them with my simple Clapp-oscillator with a FET on 11 MHz, they are only a few dB better. Should I follow another approach at 11 MHz?
Re: bft66 spice
I think that the amplitude stabilisation in an oscillator is very important for low noise (Xtal-)oscillators. I jumpt through this thread but cannot find any suggestion in this field, or do I miss subjects?
To measure phase noise I have built me a DC-receiver with a DMB in the front end. This DBM is driven by two 'the same' oscillators with amplitude differences of > 10 dB.
With this tool I am able to measure down to -170 dB from 200 Hz upwards and down to -150 dB @ 50 Hz from the carrier. Moreover...
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