A low-voltage low-power injection-locked oscillator for wearable health monitoring systems

Authors:
M. R. Haider;S. K. Islam;M. R. Mahfouz
Affiliations:
Department of Engineering Science, Sonoma State University, Rohnert Park, USA 94928;Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, USA 37996;Department of Mechanical, Aerospace and Biomedical Engineering, The University of Tennessee, Knoxville, USA 37996
Venue:
Analog Integrated Circuits and Signal Processing
Year:
2011

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Abstract

This paper reports a low-voltage low-power injection-locked oscillator suitable for short range wireless transmitter applications in a wireless body area network (WBAN). Low-power transmitter with high efficiency is a major design challenge for short range wireless communication. Unlike conventional transmitters used for cellular communication, injection-locked transmitter shows reduced power consumption and high transmitter efficiency. The core block of an injection-locked transmitter is an injection-locked oscillator. In this work a low-voltage low-power injection-locked LC oscillator has been designed and fabricated employing self-cascode structure and body-terminal coupling. The proposed oscillator has been realized using 0.18-μm RF CMOS process. Experimental results indicate that the prototype oscillator can operate with a supply voltage as low as 0.9聽V and consumes only 1.4聽mW of power. The relatively low-voltage and low-power operation of the design makes it highly suitable for low-power transmitter applications.