I am attempting to design an All-Digital Phase Lock Loop for a motor control application. I know it's been done before, and I might even find an off the shelf part that does close to what I want, but some particular requirements force me to use a CPLD/FPGA.
Anyway, I've seen several phase-detector/frequency-detector circuits and often see "Type I" or "Type IV". Is there any comprehensive list of phase/frequency detectors and/or advantages/disadvantages? I've Googled but I'm looking for some engineering insight from the people who've "been there, done that".
Essentially, what I think I need from the phase/frequency detector are UP/DOWN signals to tell my system to get the counter-based NCO to run slower or faster. Are these typically called "bang-bang" type?
Thanks for your help! Jay.