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Re: Software PLL (SPLL)

Started by Noway2 February 6, 2006
Tim,

That was a very nice explanation.  I have always considered software
PLLs to be a bit of an enigma, though a future project goal of mine is
going to require one.  In my case, the reference and the incoming
signal will both be aprox 50 or 60hz sine waves.  For the PFD, I was
planning on multiplying them and filtering the result which would be
used to drive the NCO.

I was wondering if you would you please elaborate a little more on the
concept of using the inphase and quadriture outputs and their phase
rotation and what this does / how / why it works?