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Improved switched tuning of differential CMOS VCOs

Publiceringsår: 2002
Språk: Engelska
Sidor: 352-355
Publikation/Tidskrift/Serie: IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing1992-01-01+01:002004-01-01+01:00
Volym: 49
Nummer: 5
Dokumenttyp: Artikel i tidskrift
Förlag: IEEE--Institute of Electrical and Electronics Engineers Inc.


Varactors for continuous frequency tuning are typically used in LC-oscillators. However, they have some drawbacks for large tuning-ranges, such as high tuning sensitivity causing high sensitivity to noise and disturbances on the control voltage. Furthermore, large metal-oxide-semiconductor (MOS) varactors have high conversion of harmless amplitude noise into harmful phase noise. To reduce these problems a small varactor can be used in combination with MOS-transistors that switch fixed capacitors in and out of the oscillator. The limitations due to the imperfect complementary metal-oxide-semiconductor (CMOS) switches are investigated, and an improved structure for use with the popular differential CMOS LC-oscillator is presented.


  • Electrical Engineering, Electronic Engineering, Information Engineering
  • complementary metal-oxide-semiconductor
  • differential
  • frequency tuning
  • oscillator
  • switched tuning
  • (CMOS)
  • varactor
  • voltage-controlled oscillator (VCO)


  • Analog RF-lup-obsolete
  • ISSN: 1057-7130

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