A 224–448 MHz low-power fully integrated phase-locked loop using 0.18-μm CMOS process

Jeng Han Tsai, Chia Lung Lin, Yin Ting Kuo

Research output: Contribution to journalArticle


A 224-448 MHz low-power fully integrated phase-locked loop (PLL) is designed and implemented in standard 0.18-μm CMOS process. For wide tuning rage and compact circuit size, a differential ring-type voltage-controlled oscillator (VCO) is adopted. The replica bias circuit is added to provide the required voltage for the delay cell of the VCO. For low dc consumption, a high-speed true single phase clock (TSPC) divider is used. The PLL achieves wide operating frequency from 224 to 448 MHz with low dc power consumption of 2.62 mW from 1.8 V voltage supply. The measured phase noises are −98 and −115 dBc/Hz at 100 kHz and 10 MHz frequency offsets, respectively.

Original languageEnglish
Pages (from-to)1750-1755
Number of pages6
JournalMicrowave and Optical Technology Letters
Issue number7
Publication statusPublished - 2017 Jul



  • CMOS
  • phase-locked loop (PLL)
  • radio frequency integration circuit (RFIC)
  • ring oscillator

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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