DocumentCode :
2941545
Title :
An efficient and stable power management circuit with high output energy for wireless powering capsule endoscopy
Author :
Feng, Liang ; Mao, Yu ; Cheng, Yuhua
Author_Institution :
ShangHai Res. Inst. of MircoElectronics (SHRIME), Peking Univ., Shanghai, China
fYear :
2011
fDate :
14-16 Nov. 2011
Firstpage :
229
Lastpage :
232
Abstract :
In this paper, a power management circuit (PMC) for wireless powering capsule endoscopy is presented. The PMC includes a RF Limiter, a CMOS rectifier and a low dropout (LDO) regulator. A bandgap circuit used as reference for LDO is optimized carefully and has a more than -50 dB PSRR at 2 MHz, which can effectively suppress the ripple of rectifier output used as input voltage of LDO. A voltage controlled current source (VCCS) is designed in LDO for frequency compensation in such a way that the stability of LDO is not dependent on the output capacitor´s Equivalent Series Resistance (ESR). The PMC is fabricated in a 0.35-μm CMOS process. The measurement results show that it can provide as high as 63.8 mA output current at a 3 V output voltage. The PMC has been used in a wireless powering system designed for capsule endoscope application. Experiment results show that the PMC can deliver as high as 191 mW DC energy to the load mimicking the physical condition in an biomedical environment in a human body.
Keywords :
CMOS integrated circuits; biomedical electronics; endoscopes; rectifiers; CMOS process; CMOS rectifier; DC energy; ESR; LDO regulator; LDO stability; PMC; RF Limiter; VCCS; bandgap circuit; biomedical environment; capacitor equivalent series resistance; current 63.8 mA; frequency 2 MHz; frequency compensation; human body; low-dropout regulator; power 191 mW; power management circuit; rectifier ripple suppression; size 0.35 mum; voltage 3 V; voltage-controlled current source; wireless powering capsule endoscopy; CMOS integrated circuits; Coils; Photonic band gap; Rectifiers; Regulators; Voltage control; Wireless communication;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Solid State Circuits Conference (A-SSCC), 2011 IEEE Asian
Conference_Location :
Jeju
Print_ISBN :
978-1-4577-1784-0
Type :
conf
DOI :
10.1109/ASSCC.2011.6123644
Filename :
6123644
Link To Document :
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