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Tail current noise suppression in RF CMOS VCOs

Publiceringsår: 2002
Språk: Engelska
Sidor: 342-348
Publikation/Tidskrift/Serie: IEEE Journal of Solid-State Circuits
Volym: 37
Nummer: 3
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


This paper presents the experimental results of two different techniques, inductive degeneration and capacitive filtering, for reducing the phase noise in tail-biased RF CMOS voltage-controlled oscillators (VCOs). Both techniques prevent the low-frequency tail current noise from being converted into phase noise. The techniques are applied to two distinct VCO designs, showing that the largest phase noise reduction (up to 6-7 dB at 3-MHz offset frequency from the carrier) is achieved via inductive degeneration. Capacitive filtering, however, also substantially reduces the phase noise at high offset frequencies and may therefore become a valid alternative to inductive degeneration, as discrete capacitors are of more common use than discrete inductors.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • phase noise
  • CMOS
  • VCO
  • RF


  • ISSN: 0018-9200

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