[time-nuts] PLL behavior

Raj vu2zap at gmail.com
Tue Sep 18 16:48:32 UTC 2012


If you break the DC control chain of the PLL with a A2D and a controller and back with a D2A .. you would program the control with any kind of behavior you want. Just a thought!

Raj, vu2zap

At 18-09-2012, you wrote:
>I'm looking for info on behavior of a PLL (with VCXO) when the reference comes and goes periodically. When the reference is gone, the PLL will "flywheel" according to whatever the loop filter does. (we can turn off the "input" to the filter, so we're not trying to track noise)..
>
>What I'm particularly interested in is the behavior in the PLL when the reference returns.
>
>The overall situation is where we are trying to make a frequency/phase measurement over 10-100 seconds, where the reference has a 50% duty cycle, and is on for a second, off for a second.





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