Title :
An Efficiency-Enhanced Integrated CMOS Rectifier with Comparator-Controlled Switches for Transcutaneous Powered Implants
Author :
Guo, Song ; Lee, Hoi
Author_Institution :
Univ. of Texas at Dallas, Richardson
Abstract :
This paper presents a high-efficient rectifier for high-current transcutaneous power transmission in biomedical implants. By using comparators to control power nMOS transistors functioning as switches with unidirectional current flow, the rectifier dropout voltage is decreased to improve the power efficiency. The unbalanced biasing scheme in the comparator also minimizes the reverse leakage current. Implemented in a standard 0.35 mum CMOS, the rectifier operates at 1.5 MHz, achieves the peak conversion ratio of 95% and can deliver up to 20 mA output current.
Keywords :
AC-DC power convertors; CMOS integrated circuits; field effect transistor switches; prosthetics; rectifying circuits; biomedical implants; comparator controlled switches; dropout voltage; efficiency enhanced; frequency 1.5 MHz; integrated CMOS rectifier; nMOS transistors; peak conversion ratio; reverse leakage current; size 0.35 mum; transcutaneous powered implants; unidirectional current flow; Circuits; Diodes; Implants; Leakage current; MOSFETs; Power transmission; Rectifiers; Regulators; Switches; Threshold voltage;
Conference_Titel :
Custom Integrated Circuits Conference, 2007. CICC '07. IEEE
Conference_Location :
San Jose, CA
Print_ISBN :
978-1-4244-1623-3
Electronic_ISBN :
978-1-4244-1623-3
DOI :
10.1109/CICC.2007.4405758
