What is clock recovery

1. Why is clock recovery needed?
2. What is meant by timing recovery?
3. What is clock recovery unit?
4. How a clock is recovered from data?

Why is clock recovery needed?

The main goal when transmitting an optical/electrical signal from one point to the other is to conserve the signal integrity to avoid any loss of data. A key feature is the ability to transfer timing information from source point to destination point. This timing feature is called Clock Data Recovery.

What is meant by timing recovery?

The purpose of timing recovery is to recover a clock at the symbol rate or a multiple of the symbol rate from the modulated waveform. This clock is required to convert the continuous- time received signal into a discrete-time sequence of data symbols.

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.

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).