A 5 GHz differential colpitts CMOS VCO using the bottom PMOS cross-coupled current source

Jian An Hou, Yeong Her Wang

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

A low phase noise differential Colpitts voltage- controlled oscillator (VCO) with the bottom series PMOS cross-coupled current source is presented. The core Colpitts VCO adopts a pair of PMOS as the biased current source at the bottom, instead of a conventional NMOS topology, to achieve a better phase noise performance as the PMOS has lower flicker and white noise than those of NMOS and the output power spectral density of PMOS operated in bottom-biased type is further less than that in top-biased one in the same power consumption. The fabricated VCO operates from 4.9 to 5.46 GHz with 10.6% tuning range when the power consumption is below 6.4 mW with a supply voltage of 1.8 V. The measured phase noise at 100 kHz offset is -100.3 dBc/Hz at 5.46 GHz and achieves a good FOM performance of -187 dBc/Hz.

Original languageEnglish
Article number4967844
Pages (from-to)401-403
Number of pages3
JournalIEEE Microwave and Wireless Components Letters
Volume19
Issue number6
DOIs
Publication statusPublished - 2009 Jun 1

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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