Phase frequency detector with minimal blind zone for fast frequency acquisition

  • Authors:

  • Wu-Hsin Chen;Maciej E. Inerowicz;Byunghoo Jung

  • Affiliations:

  • School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN;School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN;School of Electrical and Computer Engineering, Purdue University, West Lafayette, IN

  • Venue:
  • IEEE Transactions on Circuits and Systems II: Express Briefs
  • Year:
  • 2010

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Abstract

Blind zone in a phase-frequency detector (PFD) reduces the input detection range and aggravates cycle slips. This brief analyzes the blind zone in latch-based PFDs and proposes a technique that removes the blind zone caused by the precharge time of the internal nodes. With the proposed technique, the PFD achieves a small blind zone close to the limit imposed by process-voltage-temperature variations. The comparison between the proposed design and previous works is presented. Fabricated in a 130-nm CMOS technology, the measured blind zone is 61 ps, which is smaller than that of the existing topologies by almost 100 ps.