Title :
A 13.56MHz CMOS rectifier with switched-offset for reversion current control
Author :
Lu, Yan ; Ki, Wing-Hung ; Yi, Jun
Author_Institution :
ECE Dept., HKUST, Hong Kong, China
Abstract :
A 13.56 MHz full-wave active rectifier for wirelessly powered high-current biomedical implants is presented. It employs switched-offset in reducing the comparator delay for reversion current control. The rectifier was fabricated in a standard 0.35 μm CMOS process with an active area of 0.041 mm2. The measured power conversion efficiency is better than 83% over a wide ac input range (1.5 to 4 V) and load range (5k to 500 Ω), and reaches up to 90% at 3.5 V and 1.8 kΩ.
Keywords :
CMOS integrated circuits; biomedical electronics; comparators (circuits); prosthetics; rectifiers; CMOS process; CMOS rectifier; comparator delay; frequency 13.56 MHz; full-wave active rectifier; power conversion efficiency; reversion current control; size 0.35 mum; switched-offset; wirelessly powered high-current biomedical implant; Coils; Current measurement; MOS devices; Rectifiers; Semiconductor device measurement; Switches; Voltage measurement;
Conference_Titel :
VLSI Circuits (VLSIC), 2011 Symposium on
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-61284-175-5
