Design and Implement of Wireless Power Telemetry Circuits for Implantable Biomedical Micro-System
Date Issued
2007
Date
2007
Author(s)
Chen, Chein-Lung
DOI
en-US
Abstract
Microelectronic systems are currently hot topics in biomedical field to miniaturize implantable devices, reduce the pain of the patients and increase accuracy of the diagnosis. These systems are usually composed of implanted transponder and external components, which connected wirelessly across the skin. Power is transferred form external unit to implant, while data is transmitted between each other. These contribute lots of biomedical communication system. Up to now, power of these devices has been critical issues due to their limitations of performance. In order to confirm the performance of these devices, several methods to enhance power efficiency are discussed in this thesis.
This thesis contains four designs and implementations of the blocks of wireless power telemetry system. First, we proposed a wireless power transmission system with frequency calibration together with a high-current full-wave rectifier circuit since the efficiency of an inductive power link is mainly determined by these two factors - rectification efficiency and resonant frequency. Then, an integrated rectified regulator using active diodes is introduced to further enhance the regulation efficiency. By combining active diodes with a resistive feedback loop, sinusoid RF signals are directly converted to a regulated dc output to supply the following circuits. Finally, a CMOS low dropout linear regulator using dynamic zero compensation is proposed. By introducing a dynamic zero to track the output load current, the tolerant range of the output capacitor and equivalent series resistance (ESR) is widened, which is proper for a wireless power transmission system.
Subjects
生醫
植入
功率
遙測器
整流器
穩壓器
線圈
biomedical
wireless power
telemetry
implant
rectifier
LDO
regulator
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-96-R94943019-1.pdf
Size
23.31 KB
Format
Adobe PDF
Checksum
(MD5):cca0f23fbe1ccbce8f9cde3216650688