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Design Techniques for Non-Oversampled, Instantaneously Locked Clock and Data Recovery Circuits - An Overview

Traditional narrow-band clock recovery circuits such as those based on LC tanks, SAW filters or PLLs suffer from the fundamental limitation of locking (reaching steady-state operation) slowly compared to the input data rate. This is inconsequential in classical digital links where phase-coherent data flows continuously. However, if data arrives in asynchronous packets, as it does in modern communication systems such as PON’s (Passive Optical Networks), long locking [times cause significant penalties in the transmission efficiency. For burst-mode applications new clock recovery methods with greater acquisition agility are needed.