[time-nuts] Advantages of differential oscillator structures?

[Bob Camp]

Hi

The stability with two active devices will be worse than with one. That's true of tc, ADEV, and phase noise. 

Buffering out of the circuit is problematic for a precision application, so that's likely to add to the noise as well. 

It's a reasonable way to do a cheap oscillator. It's probably not a lot worse than some inverter feedback clocks.  It's not a great approach for a TimeNuts stable part.

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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