Design and analysis of a 77.3% locking-range divide-by-4 frequency divider

Yen Hung Kuo, Jeng Han Tsai, Hong Yeh Chang, Tian Wei Huang

Research output: Contribution to journalArticlepeer-review

32 Citations (Scopus)


A cascoded frequency divider (FD) with division number of 4 and ultra-wide locking range is presented in this paper. The proposed FD consists of a divide-by-2 (D2) injection-locked frequency divider (ILFD) core and a D2 source-injection current mode logic (SICML) divider. After the cascoded integration of ILFD and SICML, the removal of transconductance and buffer stages can lower the dc power consumption and widen the locking range. The proposed FD is implemented in 0.13-μm CMOS technology and has a 77.3% frequency locking range from 13.5 to 30.5 GHz at injection power of 0 dBm while consuming 7.3-mW dc power. Compared to the previously reported ILFDs, the proposed circuit achieves the widest locking range without employing extra tuning mechanism.

Original languageEnglish
Article number5970079
Pages (from-to)2477-2485
Number of pages9
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number10 PART 1
Publication statusPublished - 2011


  • CMOS
  • current mode logic (CML) latch
  • divide-by-4 (D4)
  • injection-locked frequency divider (ILFD)
  • monolithic microwave integrated circuit (MMIC)
  • phase-locked loop (PLL)
  • wide locking range

ASJC Scopus subject areas

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


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