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2.45 GHz power and data transmission for a low-power autonomous sensors platform

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5 Author(s)
Gregori, S. ; Dept. of Electr. Eng., Univ. of Texas at Dallas, Richardson, TX, USA ; Yunlei Li ; Huijuan Li ; Jin Liu
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This paper describes a power conversion and data recovery system for a microwave powered sensor platform. A patch microwave antenna, a matching filter and a rectifier make the system front-end and implement the RF-to-DC conversion of power carrier. The efficiency of the power conversion is as high as 47% with an input power level 250 ΩW at 2.45 GHz. Then, a 0.18 Ωm CMOS integrated circuit extracts the clock and the digital data. A modified pulse amplitude modulation scheme is used to modulate the data on the 2.45 GHz carrier frequency for combined data and power transmission; this scheme allows very low power consumption of the entire IC to be less than 10 ΩW and making the system suitable for an autonomous wireless connected sensor module.

Published in:

Low Power Electronics and Design, 2004. ISLPED '04. Proceedings of the 2004 International Symposium on

Date of Conference:

9-11 Aug. 2004