BTW, the venerable Motorola MC12061 oscillator is a bipolar version of
this circuit. It was good for audio clocks in the 12 MHz range,
including VCXOs using a series varactor.
David
On 8/10/13 2:34 PM, Bob Camp wrote:
Hi
Any bets on weather or not they have actually designed a 12.8 MHz multivibrator
that injection locks to the crystal? Pretty hard with discrete parts, but not
out of the question with silicon. You'd have to get their spice (or what ever)
files to figure it out ...
Bob
On Aug 10, 2013, at 12:03 PM, Magnus Danielson <[email protected]>
wrote:
On 08/10/2013 05:55 PM, Bob Camp wrote:
Hi
Looking at the picture of the die, I suspect their radio has a VCO on it that
they lock up through a (noisy) low frequency PLL. That would mean they really
don't care a lot about phase noise of the reference.
Agree. But I was arguing about looking at it outside of their system
limits and see if it could be practical approach otherwise. Then their
choice of transistor geometrics etc. is irrelevant. So, given that,
could it be potentially interesting?
Cheers,
Magnus
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