Clock and Data Recovery

1
Clock and Data Recovery
Receiver
CDR
Clock and data recovery to retime input data and
extract clock, which needs frequency detection
loop to wide capture range.
2
Hogge Phase Detector (Linear CDR)

• UP is the proportional pulse.
• DN is the reference pulse.
• Duty-cycle mismatch results in static phase
  error.
• Triangular pulse problem.
• Additional DFF and XOR for compensating phase
  accumulation.

3
Wide-Linear-Range FD
4
Eyediagrams with a 231-1 PRBS

55.4 ps
BER is less than 10-12.