Switched resonators and their applications in a dual-band monolithic CMOS LC-tuned VCO

A switched resonator concept, which can be used to reduce the size of multiple-band RF systems and which allows better tradeoff between phase noise and power consumption, is demonstrated using a dual-band voltage-controlled oscillator (VCO) in a 0.18-/spl mu/m CMOS process. To maximize Q of the swit...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-01, Vol.54 (1), p.74-81
Main Authors: Seong-Mo Yim, O, K.K.
Format: Article
Language:English
Subjects:
CMOS process
Dual band
Energy consumption
Inductance
Inductors
multiband
Phase noise
power consumption
Q factor
Radio frequency
RF receivers
switched inductors
switched resonators
Switches
variable inductors
voltage-controlled oscillator (VCO)
Voltage-controlled oscillators
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Summary:A switched resonator concept, which can be used to reduce the size of multiple-band RF systems and which allows better tradeoff between phase noise and power consumption, is demonstrated using a dual-band voltage-controlled oscillator (VCO) in a 0.18-/spl mu/m CMOS process. To maximize Q of the switched resonator when the switch is on, the mutual inductance between the inductors should be kept low and the switch transistor size should be optimized. The Q factor of switched resonators is /spl sim/30% lower than that of a standalone inductor. The dual-band VCO operates near 900 MHz and 1.8 GHz with phase noise of -125 and -123dBc/Hz at a 600-kHz offset and 16-mW power consumption. Compared to a single-band 1.8-GHz VCO, the dual-band VCO has almost the same phase noise and power consumption, while occupying /spl sim/37% smaller area.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2005.856102