A 2.4 GHz Low Phase Noise In-Phase Coupled Class-C Quadrature VCO in 0.18 μm CMOS

Chuan Yi Wu, Yu-Te Liao

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

This letter presents a 2.4 GHz Class-C QVCO using an in-phase coupling topology. The phase noise of the proposed QVCO is effectively reduced by using a lower gate biasing voltage at the cross-coupled pairs and an in-phase coupling technique. A complementary Class-C oscillator is employed to enhance the startup robustness over a temperature range from -25°C to 100°C. A quadrature oscillator, implemented in a 0.18 μm CMOS process, achieves a phase noise lower than -130.7 dBc/Hz at 1 MHz offsets and a frequency tuning range from 2.23 to 2.57 GHz while only consuming 3 mW. The design attains a remarkable figure-of-merit of 193.7 dBc/Hz.

Original languageEnglish
Article number7217856
Pages (from-to)675-677
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume25
Issue number10
DOIs
StatePublished - 1 Oct 2015

Keywords

  • In-phase coupling
  • low phase noise
  • oscillator

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