A TX VCO for WCDMA/EDGE in 90 nm RF CMOS

Pietro Andreani, Kirill Kozmin, Per Sandrup, Magnus Nilsson, Thomas Mattsson

Research output: Contribution to journalArticlepeer-review

62 Citations (SciVal)

Abstract

A VCO is implemented in an RF 90 nm CMOS process and covers the frequency range 2.55-4.08 GHz. Drawing 19 mA from 1.2 V, the phase noise at 20 MHz frequency offset from a 3.7 GHz carrier is -156 dBc/Hz, meeting the phase noise requirement for GSM/EDGE and SAW-less WCDMA transmitter after frequency division by 2 or by 4. A second version of the VCO covers an additional 4.90-5.75 GHz range, at the expense of a higher phase noise in the added band. In this way, all currently operational WCDMA/EDGE bands can be synthesized by a single VCO working at the double or quadruple of the desired band. A technique for shortening the transient response of the VCO during frequency tuning is also presented.
Original languageEnglish
Pages (from-to)1618-1626
JournalIEEE Journal of Solid-State Circuits
Volume46
Issue number7
DOIs
Publication statusPublished - 2011

Subject classification (UKÄ)

  • Electrical Engineering, Electronic Engineering, Information Engineering

Keywords

  • Duplex frequency
  • EDGE
  • phase noise
  • radio frequency integrated
  • circuits
  • tuning range
  • voltage controlled oscillators
  • WCDMA

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