Piezoelectric Energy Harvesting Interface Circuit and Molecular Readout Circuit for Biomedical Micro Systems
Date Issued
2014
Date
2014
Author(s)
Liu, Chi-Yun
Abstract
This thesis consists of two parts. The first part implements a low input voltage piezoelectric (PZT) energy harvesting interface circuit. To lower the input voltage range, the negative voltage converter (NVC) with Schottky diode is implemented. The startup boost converter is also implemented to supply the power of the digital controller. The adaptive pulse width detector (PWD) is proposed to find the optimal turn-on time of the switches when input ac current of PZT harvester is approaching to zero. In addition, the adaptive zero-crossing detector is proposed for a DC-DC converter to reduce the power loss while the inductor is switching. The whole circuit can convert an input voltage from 0.6V~2V to realize a stable output voltage 1V. The circuit is implemented in TSMC 0.18um CMOS process.
The second part is talking an interface circuit with digital output for acute myocardial infraction diagnosis. The low frequency transimpedance amplifier is implemented to convert the current signal from sensor to voltage signal under different bio-molecular concentration. Then, the voltage signal is converted to digital code which is proportional to different concentration. The sensor with its interface circuit can distinguish different bio-molecular concentration successfully; the expensive equipments are not needed in hospitals. When cTnI is used for bio-molecular target, the interface circuit can cover its concentration from 320fM~3.2nM. NT-proBNP is used for bio-molecular target, the interface circuit can cover its concentration from 320fM~32nM. The circuit is implemented in TSMC 0.18um CMOS process.
Subjects
壓電材料
介面電路
分子濃度
感測電路
Type
thesis
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