Title :
An active rectifier/regulator combo circuit for powering biomedical implants
Author :
Lee, Edward K. F.
Author_Institution :
Alfred Mann Found., Santa Clarita, CA, USA
Abstract :
A circuit that combines an active rectifier and a linear regulator, which will be referred to as a rectulator, is proposed in this paper. The main transistor in the rectulator is used for both the rectification of the AC input (VAC) and the regulation of the DC output (VO) to reduce the overall voltage drop between VAC and VO. The rectulator has a high power efficiency (ηP) and very good amplitude modulation (AM) rejection on VAC against AC field strength variations. A full-wave rectulator implemented in a 0.18μm CMOS process showed an AM rejection > 45dB for an AM frequency <; 2kHz. A ηP of 90.7% was measured for an input frequency of 5MHz, VO = 2.5V and an output power of 10.5mW.
Keywords :
CMOS integrated circuits; controllers; prosthetic power supplies; rectifiers; AC input; DC output; active rectifier circuit; active regulator circuit; amplitude modulation rejection; biomedical implants; field strength variations; frequency 5 MHz; high power efficiency; linear regulator; power 10.5 mW; rectulator; size 0.18 mum; voltage 2.5 V; Biomedical measurement; Implants; Rectifiers; Regulators; Switches; Transistors; Voltage control;
Conference_Titel :
Custom Integrated Circuits Conference (CICC), 2013 IEEE
Conference_Location :
San Jose, CA
DOI :
10.1109/CICC.2013.6658446
