[time-nuts] PLL behavior

Bob Camp lists at rtty.us
Tue Sep 18 16:15:38 UTC 2012


Hi

Gardner in "Phaselock Techniques" has figure 4.8 that is a pretty good
starting point.

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Jim Lux
Sent: Tuesday, September 18, 2012 11:29 AM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] PLL behavior

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.


I can fairly simply model this, or just try it, but I'm looking for some 
references to an analytical approach.

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