more frequency tracking..

[Ethan Duni]

>If you are using a pll, the control circuit itself already provides the
>necessary frequency dependent voltage, by driving the loop vco.
-i should have remembered that.. i'm new to PLL's.. at what speed will the
phase comparator (generally?) add noticable distortion? does anyone know of
a model that is a good compromise between speed and accuracy? as long as the
speed is on the order of single milliseconds or so, it should be acceptible
(no?); does there exist a phase comparator/PLL that can do that without
distortion?  (or is the distortion introduced as a result of the changes in
the VCO CV?)

anyone care to explain to me how a phase comparator works, incidentally?

Ethan