Browsing by Author "Shiu, Ming-Feng"

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A 3.3V 15.6b 6.1pJ/0.02% RH with 10ms Response Humidity Sensor for Respiratory Monitoring
(2014)
Lai, Kelvin Yi-Tse
;
Yang, Yu-Tao
;
Chen, Bang-Jing
;
Shen, Chun-Jen
;
Shiu, Ming-Feng
An event-driven and energy-efficient humidity sensor for environment detection and healthcare monitoring is presented. A differential CMOS-MEMS humidity device and proportion-based capacitance-to-digit readout circuit are proposed to overcome PVT variations, and in the meantime to improve sensitivity, response time, and conversion energy. This chip achieves 15.6b 20-90 % RH at 1KS/s, 6.1pJ per 0.02% RH of sensitivity, and 10ms fast response time in TSMC 0.35-mu m CMOS MEMS process. With variations in temperature and voltage, our proposal can minimize the errors from 40% RH to 0.2% RH and 50% RH to 0.1% RH, making it very suitable for wearable respiratory monitoring.
A Field-Programmable Lab-on-a-Chip with Built-in Self-Test Circuit and Low-Power Sensor-Fusion Solution in 0.35 mu m Standard CMOS Process
(2015)
Lai, Kelvin Yi-Tse
;
Shiu, Ming-Feng
;
Lu, Yi-Wen
;
Ho, Yingchieh
;
Kao, Yu-Chi
This paper presents a field programmable lab-on-a-chip (FPLOC) with microfluidics actuation, droplet location/category readback, built-in-self-test (BIST), and bioassays detection. This FPLOC is composed of 1,800 MEDA microelectrodes and integrates a set of microfluidic operations to perform droplet moving/cutting/mixing. Besides, capacitive sensing circuits are considered for system automation, droplets classification, malfunctioning microelectrodes and surface flatness testing, and biomedical detection. Implemented in 0.35 mu m standard CMOS process in 7.4mm(2), the FPLOC demonstrates microfluidic operations under 25V at 1KHz, 1.3fF resolution for droplet location/category/chip BIST maps readback at 1MHz, and 0.34fF sensitivity of capacitive measurement window for biomedical detection at 1KHz.