A theoretical and experimental study of injection-locked fractional frequency dividers

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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  • Jia-Lin Li
  • Shi-Wei Qu
  • Quan Xue


Original languageEnglish
Article number4636742
Pages (from-to)2399-2408
Journal / PublicationIEEE Transactions on Microwave Theory and Techniques
Issue number11
Publication statusPublished - Nov 2008


Based on the derived general locking equations and harmonic enhancement mechanisms of a nonlinear oscillator, injection-locked fractional frequency dividers are studied in this paper to improve the performance. Both theoretical analyses and experimental validations are performed and compared in this paper. For demonstrative purposes, fractional frequency-division ratios R = ωinout = 1.5, 2.5, 3.5, and 4.5 for a fundamental oscillating frequency fo = 2 GHz are presented and analyzed. The locking ranges of these demonstrators achieve 407, 201, 147, and 85 MHz, respectively, while consuming relatively low dc powers. Meanwhile, the noise performance of the studied divider is also analyzed and validated in this paper. © 2008 IEEE.

Research Area(s)

  • Fractional frequency divider, Injection locking, Locking range, Oscillator