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Improved switched tuning of differential CMOS VCOs

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Author

Summary, in English

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.

Publishing year

2002

Language

English

Pages

352-355

Publication/Series

IEEE Transactions on Circuits and Systems - 2, Analog and Digital Signal Processing

Volume

49

Issue

5

Document type

Journal article

Publisher

IEEE - Institute of Electrical and Electronics Engineers Inc.

Topic

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • complementary metal-oxide-semiconductor
  • differential
  • frequency tuning
  • oscillator
  • switched tuning
  • RF CMOS
  • (CMOS)
  • varactor
  • voltage-controlled oscillator (VCO)

Status

Published

Research group

  • Analog RF

ISBN/ISSN/Other

  • ISSN: 1057-7130