DocumentCode :
418401
Title :
An RF powered, wireless temperature sensor in quarter micron CMOS
Author :
Kocer, Fatih ; Walsh, Paul M. ; Flynn, Michael P.
Author_Institution :
Wireless Integrated Microsyst. Eng. Res. Center, Michigan Univ., Ann Arbor, MI, USA
Volume :
4
fYear :
2004
fDate :
23-26 May 2004
Abstract :
We present a wireless CMOS temperature sensor that gathers power through RF power telemetry, and transmits data wirelessly at 2.3 GHz to a base station. Power is gathered by a low threshold voltage rectifier-multiplier circuit decreasing the minimum incident peak signal amplitude required at the receiving port compared to the state of the art power telemetry systems. A low power integrated LC voltage controlled oscillator (VCO) lies at the heart of the system. The oscillation frequency of the VCO is modulated by change in the ambient temperature, and is transmitted via an integrated power amplifier. The measured phase noise of the oscillator is -101 dBc/Hz (@1 MHz offset) while consuming 400 μA, achieving a figure of merit of 171 dBc/Hz. A linear temperature sensitivity of 126 ppm/°C is achieved with a total sensor current consumption of 1.1 mA.
Keywords :
CMOS integrated circuits; convertors; electric sensing devices; multiplying circuits; phase noise; power amplifiers; radiotelemetry; rectifying circuits; temperature sensors; transceivers; voltage multipliers; voltage-controlled oscillators; 1 MHz; 1.1 mA; 2.3 GHz; 400 muA; RF power telemetry; VCO; art power telemetry systems; figure of merit; incident peak signal amplitude; integrated power amplifier; oscillation frequency; phase noise; quarter micron CMOS; radio frequency powered wireless temperature sensor; receiving port; sensor current consumption; temperature sensitivity; threshold voltage rectifier-multiplier circuit; voltage controlled oscillator; Base stations; Circuits; Heart; Power amplifiers; Radio frequency; Telemetry; Temperature sensors; Threshold voltage; Voltage-controlled oscillators; Wireless sensor networks;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on
Print_ISBN :
0-7803-8251-X
Type :
conf
DOI :
10.1109/ISCAS.2004.1329144
Filename :
1329144
Link To Document :
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