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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