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 journalArticle

39 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

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voltage controlled oscillators
Variable frequency oscillators
Phase noise
CMOS
Electric power utilization
Power spectral density
White noise
flicker
Tuning
white noise
Topology
topology
tuning
Electric potential
output
electric potential

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

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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.",
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A 5 GHz differential colpitts CMOS VCO using the bottom PMOS cross-coupled current source. / Hou, Jian An; Wang, Yeong-Her.

In: IEEE Microwave and Wireless Components Letters, Vol. 19, No. 6, 4967844, 01.06.2009, p. 401-403.

Research output: Contribution to journalArticle

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