Method to design low noise differential CMOS VCOs without tail current source

A low phase noise LC voltage-controlled oscillator (VCO) design method with differential varactors is proposed. This technique uses the VCO CMOS structure properties instead of a tail current source to limit the current. A VCO providing a 286 MHz signal is designed with 0.35- μ m standard CMOS techn...

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Bibliographic Details
Published in:International journal of electronics and communications 2006-01, Vol.60 (2), p.172-178
Main Authors: Lagutere, Thierry, Paillot, Jean-Marie, Guegnaud, Hervé
Format: Article
Language:English
Subjects:
Computer Science
Design method
Differential VCO
Phase noise
Tail current source
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Summary:A low phase noise LC voltage-controlled oscillator (VCO) design method with differential varactors is proposed. This technique uses the VCO CMOS structure properties instead of a tail current source to limit the current. A VCO providing a 286 MHz signal is designed with 0.35- μ m standard CMOS technology. This VCO without current limiting MOS transistors has to fulfill APCO, TETRA and TETRAPOL phase noise requirements. The 286 MHz VCO phase noise measurement result is equal to - 130 dBc / Hz at 100 kHz.
ISSN:1434-8411
1618-0399
DOI:10.1016/j.aeue.2005.05.003