NDLI: An Ultra-low-supply Dual-band VCO for Wireless Sensor Networks

Content Provider	IEEE Xplore Digital Library
Author	Bo Zhao Yongpan Liu Pengpeng Chen Tao Chen Huazhong Yang Hui Wang
Copyright Year	2009
Description	Author affiliation: Faculty of Electronic Engineering, TNList, Tsinghua University, Beijing, 100084, China (Yongpan Liu; Huazhong Yang; Hui Wang) \|\| Electronic Engineering Dept, TNList, Tsinghua University, Beijing, 100084, China (Bo Zhao; Pengpeng Chen; Tao Chen)
Abstract	Aggressive scaling down reduces the supply voltage of digital integrated circuits continuously. In order to realize Systems-On-a-Chip (SOC), analog and RF circuits should also work under the reduced voltage. For Wireless Sensor Networks (WSN), low supply is important for communication nodes as the supply voltage must be low enough under a single solar cell as power source. Besides, the future transceiver system for WSN must be able to adapt itself to various applications and environments, so multi-mode is the trend. In multi-mode systems, it would be ideal to use a signal oscillator which can generate multiple frequencies. Therefore, a Ultra-low-supply Dual-band Voltage-Controlled Oscillator (UDVCO) is proposed here. The presented UDVCO can be dynamically switched between two bands near 2.4-GHz and the 5-GHz. Its minimal operating voltage is 0.5 V by connecting the substrate of the cross-coupled NMOSFETs to the supply. A mathematical model is built for the low-supply VCOs, whose accuracy is validated by SpectreRF simulation. A series of LC tank is used as a noise filter for both the two bands. The chip is fabricated in the 0.18-µm CMOS HJTC technology. Our measurement results show that the low-frequency band can be tuned from 2.01 GHz to 2.08 GHz and the phase noise is about −82.17 dBc/Hz@1MHz; while the high-frequency band ranging from 3.24 GHz to 3.44 GHz and the phase noise is about −74.33 dBc/Hz@1MHz.
Starting Page	797
Ending Page	801
File Size	4786996
Page Count	5
File Format	PDF
ISBN	9781424448869
DOI	10.1109/ICCCAS.2009.5250407
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2009-07-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Phase noise Radio frequency Wireless sensor networks Low voltage Voltage-controlled oscillators Photovoltaic cells Dual band Digital integrated circuits CMOS technology System-on-a-chip
Content Type	Text
Resource Type	Article

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