Digitally controlled oscillator and all-digital frequency-locked loop and phase-locked loop based on digitally controlled oscillator

摘要

A digitally controlled oscillator, including: a frequency divider chain, configured to perform frequency division on an input clock signal to produce K basic clock signals, wherein frequencies and periods of the K basic dock signals are the same and a time difference between two adjacent basic clock signals is a basic time unit; and a frequency synthesizer, configured to receive the K basic clock signals from the frequency divider chain, determine a first period and a second period according to the basic time unit and a frequency control word, and generate a synthetic clock signal based on the K basic clock signals, wherein the synthetic clock signal uses the first period and the second period in an alternate manner.