PMA RX in coarse loop for high speed sampling

Details PMA RX in coarse loop for high speed sampling PMA RX in coarse loop for high speed sampling

2007-05-29

2007-05-29

Tran, Pablo N. (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Local control of receiver operation

C455S179100, C455S180300, C455S182300, C455S318000, C455S326000, C375S355000

Reexamination Certificate

active

10659966

ABSTRACT:
A device and a method for processing high data rate serial data includes circuitry for recovering a clock based on the high data rate input data stream. A transceiver includes a coarse loop of a phase-locked loop that selectively provides a clock having accuracy that is within a specified amount. In a sample mode of operation, only the coarse loop PLL is coupled to provide an error signal from which an oscillation signal and clock may be derived. In a second mode (lock) of operation, the transceiver may lock to the received serial data stream by coupling the fine loop PLL to provide an adjusted error signal. In a third mode of operation, (automatic) the transceiver initially performs coarse loop calibration by de-coupling the fine loop PLL and coupling the coarse loop PLL until a steady state has been reached.

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