Frequency and Phase Difference Control Using Fractional- $N$ PLL Synthesizers by Composition of Control Data

This paper proposes novel frequency and phase difference control of output signals in multiple fractional-
N
PLL (F-PLL) synthesizers sharing a reference signal. In the proposed F-PLL synthesizers, frequency control and phase difference control can be performed independently through cyclic shift and composition of control data of frequency dividers. The proposed synthesizers are demonstrated in the
L
-band, realizing highly accurate output frequency and phase difference control. The measured phase difference error from a designed value is plusmn2deg or less.