Ultra low power transceivers for wireless sensors and body area networks

Research output: Chapter in Book/Report/Conference proceedingPaper in conference proceeding

Abstract

A transceiver suitable for devices in wireless body area networks is presented. Stringent requirements are imposed by the high link loss between opposite sides of the body, about 85 dB in the 2.45 GHz ISM band. Despite this, minimum physical size and power consumption are required, and we target a transceiver with 1 mm2 chip area, 1 mW active power consumption, and data rate 250 kbit/s. The receiver is fully integrated., fabricated and measured in 65-nm CMOS, and size and power consumption are carefully considered at all levels of circuit and system design. The modulation is frequency shift keying, chosen because transmitters can be realized with high efficiency and low spurious emissions; a modulation index 2 creates a midchannel spectral notch. A direct-conversion receiver achieves minimum power consumption. A tailored demodulation structure makes the digital baseband compact and low power. The channel decoder has been implemented in both analog and digital domains to find the most power efficient solution. Antenna design and wave propagation are studied via simulations with phantoms. The 2.45 GHz ISM band was chosen as a good compromise between antenna size and link loss. An ultra-low power medium access scheme based on a duty-cycled wake-up receiver is designed.

Details

Authors
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Electrical Engineering, Electronic Engineering, Information Engineering
Original languageEnglish
Title of host publication2014 8th International Symposium on Medical Information and Communication Technology (ISMICT)
PublisherIEEE - Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)978-1-4799-4856-7
Publication statusPublished - 2014
Publication categoryResearch
Peer-reviewedYes
Event8th International Symposium on Medical Information and Communication Technology (ISMICT) - Firenze, Italy
Duration: 2014 Apr 2 → …

Publication series

Name
ISSN (Print)2326-828X

Conference

Conference8th International Symposium on Medical Information and Communication Technology (ISMICT)
CountryItaly
CityFirenze
Period2014/04/02 → …