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Transactions: WSEAS TRANSACTIONS ON ELECTRONICS
Transactions ID Number: 32-670
Full Name: Tianwang Li
Position: Doctor (Researcher)
Age: ON
Sex: Male
Address: Room 301, building 66, lane 811, east Boshan road, Shanghai, 200136, china
Country: CHINA
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E-mail address: twli_paper@163.com
Other E-mails: Li_tianwang@ieee.org
Title of the Paper: Ultra Low voltage, Wide Tuning Range Voltage Controlled Ring Oscillator
Authors as they appear in the Paper: Tianwang Li, Bo Ye, Jinguang Jiang
Email addresses of all the authors: Li_tianwang@ieee.org, YEBO925@ieee.org, Jinguang@whu.edu.cn
Number of paper pages: 10
Abstract: The operation voltage of modern IC product is already less than 1V with the process scaling. Ultra low voltage such as 0.5V supply analog circuit design is very challenge. Nevertheless, with current available voltage controlled ring oscillator, it is unable to work properly for 0.5V power supply. This paper presents a ultra low voltage, wide tuning range voltage controlled oscillator (VCO) with bulk driven technique. The threshold voltage of PMOS and NMOS transistors is reduced by forward biasing the bulk junction of the transistors. The linearity of four different PMOS loading architectures is compared in this paper. The PMOS load with best linearity is used in the proposed delay cell, and the frequency of the VCO is tuned by changing the resistance of the loading transistors. The proposed VCO is designed in 0.18 ƒÝm RF CMOS process. The frequency of the VCO is changed from 82 MHz to 370 MHz when the control voltage is from 0.5 V to 0 V. The power consumption of t!
he proposed VCO is only 60 ƒÝW when the VCO works at 370MHz.
Keywords: Ultra low voltage, Voltage controlled ring oscillator, Phase noise, Tuning range, Bulk driven
EXTENSION of the file: .doc
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