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More questions pls? When I go to online PLL filter component value calculators like this one for example: https://www.changpuak.ch/electronics/pll_loopfilter_calc.php, I noticed that for the 3rd order filter, if I reduce the filter attenuation value to 0bd then the 3rd order filter calculations provide the same component values as the 2nd order filter.  This implies that the values it is providing for the 2nd order filter provide 0db attenuation.  Why would anyone ever want 0db attenuation? What does 0db really mean in this context? Surely I need to filter out some of the reference frequency, yes?