A compact and low power 5-10 GHz quadrature local oscillator for cognitive radio applications

Jianhua Lu*, Ning Yi Wang, Mau-Chung Chang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This paper presents the design and implementation of a compact and low power quadrature local oscillator (LO) for creating 13.3-20 GHz signal initially from a differentially tuned LC-VCO and then converting it to the desired 5-10 GHz with continuous frequency coverage. To accomplish such purpose, a 4-stage differential injection-locked ring oscillator (ILRO) is used subsequently to the latch-based divider to generate quadrature output phases without restricting 50% duty cycle from input signals as those of conventional divide-by-2 approaches. When implemented in a 65 nm general purpose CMOS IC technology, the integrated quadrature-phased LO consumes 22 mA of current at a 1 V supply and is able to exhibit the worst-case phase noise of ${-}104$ dBc/Hz at 1 MHz offset across the entire 5-10 GHz band for intended cognitive radio applications.

Original languageEnglish
Article number6153394
Pages (from-to)1131-1140
Number of pages10
JournalIEEE Journal of Solid-State Circuits
Volume47
Issue number5
DOIs
StatePublished - 1 May 2012

Keywords

  • CMOS
  • cognitive radio
  • frequency extension
  • injection-locked ring oscillator
  • LC-VCO
  • quadrature phase local oscillator

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