A 0.3-V power supply 2.4-GHz-band Class-C VCO IC with amplitude feedback loop in 65-nm CMOS

Xin Yang, Yorikatsu Uchida, Kangyang Xu, Wei Wang, Toshihiko Yoshimasu

Research output: Contribution to journalArticle

5 Citations (Scopus)


A Class-C voltage-control-oscillator (VCO) IC with an amplitude feedback loop for ultra-low-voltage application is proposed. The Class-C VCO consists of an LC-VCO circuit and an amplitude feedback loop to shift LC-VCO bias condition from initial Class-AB start-up to steady Class-C low current oscillation. The amplitude feedback loop is formed by a detector and a comparator with low voltage supply. The LC-VCO IC has been designed, fabricated and fully evaluated using 65-nm CMOS technology. The fabricated Class-C VCO IC exhibits a measured phase noise of -111 dBc/Hz at 1 MHz offset from the 2.43 GHz carrier frequency at a supply voltage of only 0.3 V.

Original languageEnglish
Pages (from-to)583-591
Number of pages9
JournalAnalog Integrated Circuits and Signal Processing
Issue number3
Publication statusPublished - 2014 Dec 2



  • 65-nm CMOS
  • Class-C
  • LC-VCO
  • Low voltage

ASJC Scopus subject areas

  • Signal Processing
  • Hardware and Architecture
  • Surfaces, Coatings and Films

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