Low-Phase-Noise Gigahertz Voltage-Controlled Oscillators in CMOS

  • Jan Craninckx
  • Michiel Steyaert


A design strategy for the realization of low-phase-noise VCOs is presented. The possible realizations of integrated inductors are discussed, with emphasis on bondwire inductors. A general formula for the phase noise in LC-tuned oscillators is derived, based on the concepts of effective resistance and capacitance. A trade-off between noise and power is possible with the newly developed enhanced LC-tanks. An oscillator based on these principles was implemented in a 0.7-μm CMOS technology. Measured phase noise is-85 dBc/Hz at 10 kHz from the 1.8-GHz carrier.


Phase Noise Series Resistance Noise Source Active Inductor Parasitic Resistance 
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Copyright information

© Springer Science+Business Media Dordrecht 1996

Authors and Affiliations

  • Jan Craninckx
    • 1
  • Michiel Steyaert
    • 1
  1. 1.K. U.LeuvenESAT-MICASHeverleeBelgium

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