Low-voltage K -band divide-by-3 injection-locked frequency divider with floating-source differential injector

Yi Tsung Chen, Ming Wei Li, Hsin Chih Kuo, Tzuen-Hsi Huang, Huey-Ru Chuang

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This paper presents the design of a direct-injection divide-by-3 frequency divider operating at the K -band. The divider is implemented in a 0.18-μm CMOS process. The measured free-running frequency of the divider is 7.96 GHz. By utilizing a floating-source differential injector and without a varactor tuning in the divider core, the total locking range is 3.2 GHz with a power consumption of 8.28 mW from a supply voltage of 0.9 V. The total power consumption of the buffers is 9.54 mW from a supply voltage of 1.8 V. The measured phase noise of the divider is -141.3 dBc/Hz at 1-MHz offset when the input referred signal with a phase noise of -132.8 dBc/Hz at 1-MHz offset from 24 GHz. The phase-noise difference of 8.5 dB is close to the theoretical value of 9.5 dB for division-by-3. The output power of the divider is more than -11 dBm over the whole locking range.

Original languageEnglish
Article number6093943
Pages (from-to)60-67
Number of pages8
JournalIEEE Transactions on Microwave Theory and Techniques
Issue number1
Publication statusPublished - 2012 Jan 1


All Science Journal Classification (ASJC) codes

  • Radiation
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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