> About PLL:
> I know that a PLL is used to lock on to a special freq
> but everyone here seems to agree on that it can be used
> to multipy by 8 ?!?

A PLL (phased locked loop) locks the output of its own oscillator to an
incoming signal.  It does this by adjusting the frequency of its own
oscillator from the phase error between the two signals.  Now suppose the
oscillator was run thru a counter to divide its frequency by N before being
phase compared to the input signal.  If oscillator/N is phase locked to the
input, then oscillator must be input * N.

I've left out lots of details, especially regarding implementation and
limitations, but I'm sure there is LOTS of stuff on PLLs out there on the
web.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, olin@embedinc.com, http://www.embedinc.com

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