A "'bang-bang "'charge pump phase detector must always have a "'dead band "'where the phases of inputs are close enough that the detector detects no phase error.
32.
In 1976 it was shown that by using a three-state phase detector configuration ( using only two flip-flops ) instead of the original RCA / Motorola twelve-state configurations, this problem could be elegantly overcome.
33.
A "'phase detector "'or "'phase comparator "'is a frequency mixer, analog multiplier or logic circuit that generates a voltage signal which represents the difference in phase between two signal inputs.
34.
A phase detector for a bang-bang charge pump must always have a "'dead band "'where the phases of inputs are close enough that the detector fires either both or neither of the charge pumps, for no total effect.
35.
A digital phase locked loop uses a digital phase detector; it may also have a divider in the feedback path or in the reference path, or both, in order to make the PLL's output signal frequency a rational multiple of the reference frequency.
36.
A mixer-based detector ( e . g ., a Schottky diode-based double-balanced mixer ) provides " the ultimate in phase noise floor performance " and " in system sensitivity . " since it does not create finite pulse widths at the phase detector output.
