[time-nuts] Advantages & Disadvantages of the TPLL Method

Magnus Danielson magnus at rubidium.dyndns.org
Wed Jun 16 17:59:57 UTC 2010


On 06/16/2010 06:16 PM, Bob Camp wrote:
> Hi
>
> If the oscillator you have happens to injection lock at 90 degrees, or quite
> near it, then that's not going to help. If the oscillator you have likes to
> lock at 21 degrees then it will help you out. The angle varies device to
> device.

If the injection lock gain is significantly less than the intended loop 
gain, then it may have any angle without significant influence. If these 
gains is close, it matters and if the injection lock gain is larger, it 
will dominate and care much be taken to ensure stable phase in order to 
have a stable gain.

A tight PLL has a fairly high gain, so if the injection lock gain is 
sufficiently low (should always be verified!) then the effect should be 
low enought.

The Wolaver analysis assumes a phase angle, so the model includes the 
angle-effect.

Cheers,
Magnus



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