Low power MICS band Transmitter for Bio-Medical Sensor Nodes with Driving Capability by Energy Harvesting Systems

Borjkhani, Hadi; Sheikhaei, Samad; Borjkhani, Mehdi

doi:10.22041/ijbme.2014.13554

Low power MICS band Transmitter for Bio-Medical Sensor Nodes with Driving Capability by Energy Harvesting Systems

Document Type : Full Research Paper

Authors

Hadi Borjkhani ¹

Samad Sheikhaei ²

Mehdi Borjkhani ³

¹ MSc. Graduated, School of Electrical and Computer Engineering, College of Engineering, University of Tehran

² Assistant Professor, School of Electrical and Computer Engineering, College of Engineering, University of Tehran

³ PhD Candidate, School of Electrical and Computer Engineering, College of Engineering, University of Tehran - Instructor, Collage of Electrical Engineering, Urmia University of Technology

https://doi.org/10.22041/ijbme.2014.13554

Abstract

Currently need for ultra low power wireless transmitters in medical applications are inevitable. In this paper a new transmitter for body-worn and implantable sensor nodes is presented. Most of the sensor nodes supply their power using energy harvesting instead of a battery, since the power earned by harvesting is limited, so the average and the peak power consumption of the sensor node must be minimized. Transmitter blocks which implemented in sensor nodes are too power consuming. So a new low power Binary Frequency Shift Keying (BFSK) transmitter based on sub-harmonic current mode injection locking, and edge combining technique has been proposed. The proposed transmitter was designed to make a mutual communication between sensor node and base station, so there is no need for complexity at receiver side. In order to reduce the consuming power at transmitter side, BFSK modulation is done at reference frequency to prevent usage of power consuming low phase noise oscillator at carrier frequency. A 34MHz reference clock is used and the frequency of reference clock multiplied by 12 for desired carrier frequency. The phase noise of the carrier at 1MHz frequency offset is -117 dBc/Hz. Total power consumption of the transmitter is about 144μW. The output carrier frequency is 408MHz. BFSK modulation scheme is used at the frequency much lower than the carrier frequency in order to reduce the power consumption.

Keywords

Sensor Node

Low power Transmitter

Sub-Harmonic Injection Locking

Frequency Multiplication

Ring Oscillator

Edge Combine

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