A 0.5-to-2.5Gb/s reference-less half-rate digital CDR with unlimited frequency acquisition range and improved input duty-cycle error tolerance

@article{Inti2011A0R,
  title={A 0.5-to-2.5Gb/s reference-less half-rate digital CDR with unlimited frequency acquisition range and improved input duty-cycle error tolerance},
  author={Rajesh Inti and Wenjing Yin and Amr Elshazly and Naga Sasidhar and Pavan Kumar Hanumolu},
  journal={2011 IEEE International Solid-State Circuits Conference},
  year={2011},
  pages={438-450}
}
Clock and data recovery (CDR) circuits with wide frequency acquisition range offer flexibility in optical communication networks, help reduce link power through activity-based rate adaptation, and minimize cost with a single-chip multi-standard solution. Extracting the bit rate from the incoming random data stream is the main challenge in implementing reference-less CDRs. A conventional rotational frequency detector has a limited acquisition range of about ±50% of the VCO frequency, consumes… CONTINUE READING

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