Clock + phase recovery

1. How does clock recovery work?
2. What is a clock recovery circuit?
3. How a clock is recovered from data?
4. What is clock recovery unit?
5. What is CDR in transceivers?

How does clock recovery work?

How does CDR work? It locks on a frequency that is retrieved from incoming data stream. To do so, it detects the data transitions and locks an VCO (Voltage Controlled Oscillator) to that frequency. This frequency is then used when generating the transmitted data bit stream.

What is a clock recovery circuit?

A clock recovery circuit supplies timing to a phase locked loop (PLL), which in turn controls a clock for the recovered upstream information, as we describe shortly. From: Modern Cable Television Technology (Second Edition), 2004.

How a clock is recovered from data?

The receiver generates a clock from an approximate frequency reference, and then phase-aligns the clock to the transitions in the data stream with a phase-locked loop (PLL). This is one method of performing a process commonly known as clock and data recovery (CDR).

What is clock recovery unit?

The CRU, used for Clock Data Recovery (CDR), generates a clock based on a reference clock and the incoming serial data to generate a high-speed clock synchronized to the transitions inside the data.

What is CDR in transceivers?

Higher data rate transceivers are equipped with Clock Data Recovery (CDR) to ensure the transmitted and received signals are synchronized for optimal transmission.