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Some digital data streams, especially high-speed serial data streams, (such as the raw stream of data from the magnetic head of a disk drive) are sent without an accompanying clock. The receiver generates a clock from an approximate frequency reference, and then phase-aligns to the transitions in the data stream with a phase-locked loop (PLL). This process is commonly known as clock and data recovery (CDR).
safwatonline said:u cannot , a special PD must be used as it alligins the phase and not like PFD which lock to the frequency
PD used for CDR are as alexander and hogg , refer to razavi's optical communication book for more details