Method and apparatus for fast frequency acquisition in PLL system

摘要

A Method and Apparatus for Fast Frequency Acquisition in PLL System has been disclosed. In one implementation a time to digital converter is used with cycle slip detection for fast acquisition and lock. In one implementation cycle slip detection is applied to determine if a feedback clock from an oscillator is faster than a reference clock or not in one measurement cycle.

主权项

1. A method for fast acquisition and lock of a phase locked loop comprising:
using a time to digital converter to measure a phase difference between a feedback clock signal and a reference clock signal in said phase locked loop; and using a cycle slip detection logic to determine a relationship between said feedback clock signal and said reference clock signal in said PLL.