Robustness enhancement of a class-c quadrature oscillator using capacitive source degeneration coupling

Chi Hao Hong, Chuan Yi Wu, Yu-Te Liao

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

This brief presents a low-phase-noise Class-C-type quadrature voltage-controlled oscillator (QVCO) with a robust start-up. The chip was implemented using the 0.18-μm CMOS technology. A source degeneration coupling technique is used to generate quadrature signals and enables the elimination of bimodal oscillation. Capacitive degeneration coupling also provides negative impedance to compensate for losses in the LC tank, resulting in less power consumption in the core circuit to sustain oscillation. The proposed 2.4-GHz QVCO design achieves a 13.46% tuning range and a phase noise of-128.65 dBc/Hz at a 1-MHz offset while only consuming 2.67 mW from a 1.8-V supply. The oscillator demonstrated robust operation from-25 ° C to 85 °C with phase noise lower than-122 dBc/Hz at a 1-MHz offset. The proposed QVCO achieves a remarkable figure of merit of-192 dBc/Hz.

Original languageEnglish
Article number6922507
Pages (from-to)16-20
Number of pages5
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
Volume62
Issue number1
DOIs
StatePublished - Jan 2015

Keywords

  • capacitive degeneration coupling
  • Class-C
  • low phase noise
  • Quadrature signal
  • robust startup

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