[time-nuts] Advantages of differential oscillator structures?

[David McGaw]

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 <magnus at rubidium.dyndns.org> 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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