Title :
Human body channel energy harvesting scheme with −22.5 dBm sensitivity 25.87% efficiency threshold-compensated rectifier
Author :
Jiayi Wang ; Yongan Zheng ; Shi Wang ; Maoqiang Liu ; Huailin Liao
Author_Institution :
Key Lab. of Microelectron. Devices & Circuits (MOE), Peking Univ., Beijing, China
Abstract :
A novel human body channel (HBC) energy harvesting scheme for body sensor networks (BSNs) is proposed in this paper. Human body channel is utilized innovatively as energy transmission medium to reduce the transmission loss dramatically and eliminate influence of shadow effect. Further, a high sensitivity and efficiency rectifier is presented by introducing an effective threshold compensation circuit. Experimental results of the energy harvesting scheme show that it can supply 2-μW power typically at -5 dBm transmitted power and up to 19.5-μW at +7 dBm transmitted power by 30 cm distance of human body channel. The sensitivity of the proposed rectifier is -22.5 dBm with 1-V output voltage. When offering 5-μA output current, the rectifier can achieve 25.87% efficiency. The rectifier is implemented in a standard 0.18-μm CMOS process and operating frequency is 145 MHz.
Keywords :
CMOS integrated circuits; body sensor networks; energy harvesting; losses; CMOS process; body sensor network; current 5 muA; distance 30 cm; energy transmission medium; frequency 145 MHz; human body channel energy harvesting scheme; power 2 muW; shadow effect; size 0.18 mum; threshold compensated rectifier; transmission loss reduction; voltage 1 V; Batteries; CMOS integrated circuits; Energy harvesting; Propagation losses; Rectifiers; Sensitivity; Threshold voltage;
Conference_Titel :
Circuits and Systems (ISCAS), 2015 IEEE International Symposium on
Conference_Location :
Lisbon
DOI :
10.1109/ISCAS.2015.7168577
