CMOS 120 GHz phase-locked loops based on two different VCO topologies

Junghwan Yoo, Jae Sung Rieh

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


This work describes the development and comparison of two phase-locked loops (PLLs) based on a 65-nm CMOS technology. The PLLs incorporate two different topologies for the output voltage-controlled oscillator (VCO): LC cross-coupled and differential Colpitts. The measured locking ranges of the LC cross-coupled VCO-based phase-locked loop (PLL1) and the Colpitts VCO-based phase-locked loop (PLL2) are 119.84-122.61 GHz and 126.53-129.29 GHz, respectively. Th e output powers of PLL1 and PLL2 are -8.6 dBm and -10.5 dBm with DC power consumptions of 127.3 mW and 142.8 mW, respectively. The measured phase noise of PLL1 is -59.2 at 10 kHz offset and -104.5 at 10 MHz offset, and the phase noise of PLL2 is -60.9 dBc/Hz at 10 kHz offset and -104.4 dBc/Hz at 10 MHz offset. The chip sizes are 1,080 μm × 760 μm (PLL1) and 1,100 μm × 800 μm (PLL2), including the probing pads.

Original languageEnglish
Pages (from-to)98-104
Number of pages7
JournalJournal of Electromagnetic Engineering and Science
Issue number2
Publication statusPublished - 2017 Apr 1

Bibliographical note

Funding Information:
This work was supported by the National Research Foundation under a grant funded by the Korea Government (MSIP) (NRF-2015R1A2A1A05001836).


  • CMOS
  • Frequency Doubler
  • Phase-Locked Loop (PLL)
  • Signal Source
  • Voltage-Controlled Oscillator (VCO)

ASJC Scopus subject areas

  • Radiation
  • Instrumentation
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


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