Abstract
, Colin Weltin-Wu, Daniele Baldi, Marco Cusmai, and Francesco Svelto , Member , IEEE
Abstract—Nonlinearities in the time-to-digital converter (TDC)
are a significant source of fractional spurs in a divider-less frac-
tional-N ADPLL. Using an abstract model for the TDC, this paper
presents a dithering method which is mathematically shown to
suppress fractional tones, in conjunction with a feedforward
dither cancellation technique which suppresses dither-induced
phase noise. A mostly-digital calibr