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Journal of Emerging Trends in Engineering and Applied Sciences (JETEAS)


Article Title: An Ultra-Low-Power 15-bit Digitally Controlled Oscillator with High Resolution
by Nasser Erfani Majd and Mojtaba Lotfizad

In this paper, an ultra low power 15-bit digitally controlled oscillator is proposed. The proposed DCO is designed based on a segmental coarse-tuning stage and employs hysteresis delay cell (HDC) and digitally controlled varactor (DCV) in the fine-tuning stage. The proposed circuit has a simple structure, and the power consumption of this design is very low. Simulation of proposed DCO using TSMC 180nm model achieves controllable frequency range of 205MHz ~ 925MHz with a wide linearity. Monte Carlo simulation demonstrates that the time-period jitter due to random power supply fluctuation is under 90 ps and the power consumption is 255uW at 205MHz with 1.8V power supply.
Keywords: digitally controlled oscillator, low power, high resolution, linearity, hysteresis delay cell
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ISSN: 2141-7016

Editor in Chief.

Prof. Gui Yun Tian
Professor of Sensor Technologies
School of Electrical, Electronic and Computer Engineering
University of Newcastle
United Kingdom



Copyright © Journal of Emerging Trends in Engineering and Applied Sciences 2010