Title :
A passive wireless sensor with reflective nonlinear transmission lines for capacitive signal transduction
Author :
Yu, Fan ; Ma, Yunfei ; Kan, Edwin C.
Author_Institution :
Sch. of Electr. & Comput. Eng., Cornell Univ., Ithaca, NY, USA
Abstract :
A passive RFID transponder with reflective nonlinear transmission lines (NLTLs) has been developed for capacitive sensor detection. By detecting the phase change in the harmonic signal generated by NLTLs, the capacitive sensor information can be monitored wirelessly. To show the feasibility and design procedure, two open-ended NLTLs with terminating capacitive sensors are implemented in IBM 0.13μm CMOS process. The NLTLs with Bragg cutoff frequency fB = 10 GHz and 15 GHz achieve an average of 0.25°/fF and 0.61°/fF in the phase of the reflected harmonic signal, when the modeled sensor capacitance changes from 290 fF to 900 fF and from 117 fF to 362 fF, respectively.
Keywords :
CMOS integrated circuits; radiofrequency identification; telecommunication transmission lines; transponders; wireless sensor networks; Bragg cutoff frequency; CMOS process; NLTL; capacitive sensor information; capacitive signal transduction; passive RFID transponder; passive wireless sensor; reflected harmonic signal; reflective nonlinear transmission lines; Capacitance; Frequency modulation; Harmonic analysis; Power system harmonics; Power transmission lines; Radiofrequency identification; Varactors; RFID tag; capacitive sensors; nonlinear transmission line; phase variance;
Conference_Titel :
Radio and Wireless Symposium (RWS), 2012 IEEE
Conference_Location :
Santa Clara, CA
Print_ISBN :
978-1-4577-1153-4
DOI :
10.1109/RWS.2012.6175331
