A low power low phase noise dual-band multiphase VCO

  • Authors:

  • Juan Xie;M. Krishna Vamshi;Manh Anh Do;Chirn Chye Boon;Kiat Seng Yeo

  • Affiliations:

  • School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore;School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore

  • Venue:
  • Microelectronics Journal
  • Year:
  • 2012

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Abstract

This paper presents a low-power low-phase noise multiphase VCO that operates in 2.5GHz and 5.0GHz frequency bands. The dual-band multiphase VCO uses the frequency doubling method to generate the higher band signals from the lower band signals, and it shows excellent phase noise performance compared to other dual-band multiphase VCOs presented in literature. The VCO has been implemented in 0.18@mm CMOS technology, and its frequency is tunable from 2.23GHz to 2.68GHz and from 4.46GHz to 5.36GHz. The measured phase difference between the I/Q signals is 90.0^o/88.9^o for the two frequency bands respectively. The phase noise figure-of-merits (FOMs) for the two frequency bands are -189.4dB and -185.1dB.