Low-power low-phase-noise differentially tuned quadrature VCO design in standard CMOS

This paper describes the design and optimization of VCOs with quadrature outputs. Systematic design of fully integrated LC-VCOs with a high inductance tank leads to a cross-coupled double core LC-VCO as the optimal solution in terms of power consumption. Furthermore, a novel fully differential frequ...

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Bibliographic Details
Published in:IEEE journal of solid-state circuits 2001-07, Vol.36 (7), p.1018-1024
Main Author: Tiebout, M.
Format: Article
Language:English
Subjects:
CMOS
Design engineering
Design optimization
Electric potential
Energy consumption
Frequency
GSM
Inductance
Optimization
Power dissipation
Power supplies
Quadratures
Tanks
Tuning
Voltage
Voltage-controlled oscillators
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Summary:This paper describes the design and optimization of VCOs with quadrature outputs. Systematic design of fully integrated LC-VCOs with a high inductance tank leads to a cross-coupled double core LC-VCO as the optimal solution in terms of power consumption. Furthermore, a novel fully differential frequency tuning concept is introduced to ease high integration. The concepts are verified with a 0.25-/spl mu/m standard CMOS fully integrated quadrature VCO for zero- or low-IF DCS1800, DECT, or GSM receivers. At 2.5-V power supply voltage and a total power dissipation of 20 mW, the quadrature VCO features a worst-case phase noise of -143 dBc/Hz at 3-MHz frequency offset over the tuning range. The oscillator is tuned from 1.71 to 1.99 GHz through a differential nMOS/pMOS varactor input.
ISSN:0018-9200
1558-173X
DOI:10.1109/4.933456