2.4-GHz band low-voltage class-C PMOS VCO IC with amplitude feedback loop

Xiao Xu, Xin Yang, Toshihiko Yoshimasu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)


A novel 2.4 GHz-band 0.5-V Class-C PMOS VCO IC with an amplitude feedback loop is proposed. The amplitude feedback loop circuit consists of a detector, an invertor and a bias control circuit. The feedback loop automatically changes the bias of LC-VCO and shifts the oscillation mode from initial Class-AB to Class-C in steady-state. The Class-C VCO IC is designed, fabricated and fully evaluated in 180-nm CMOS technology. The fabricated VCO IC has exhibited a measured phase noise of-117.4 dBc/Hz at 1 MHz offset from the 2.25 GHz carrier frequency with a supply voltage of only 0.5-V.

Original languageEnglish
Title of host publication2015 Asia-Pacific Microwave Conference Proceedings, APMC 2015
EditorsFan Meng, Wei Hong, Guang-Qi Yang, Zhe Song, Xiao-Wei Zhu
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479987658
Publication statusPublished - 2015
Event2015 Asia-Pacific Microwave Conference, APMC 2015 - Nanjing, China
Duration: 2015 Dec 62015 Dec 9

Publication series

NameAsia-Pacific Microwave Conference Proceedings, APMC


Conference2015 Asia-Pacific Microwave Conference, APMC 2015


  • Class-C
  • Feedback Loop
  • LC-VCO
  • Low voltage
  • PMOS

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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