Browsing by Author "Huang, Hong-Yi"

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A Low-Power Bio-Potential Acquisition System with Flexible PDMS Dry Electrodes for Portable Ubiquitous Healthcare Applications
(2013-03-01)
Chen, Chih-Yuan
;
Chang, Chia-Lin
;
Chang, Chih-Wei
;
Lai, Shin-Chi
;
Chien, Tsung-Fu
This work describes a bio-potential acquisition system for portable ubiquitous healthcare applications using flexible polydimethylsiloxane dry electrodes (FPDEs) and a low-power recording circuit. This novel FPDE used Au as the skin contact layer, which was made using a CO2 laser and replica method technology. The FPDE was revised from a commercial bio-potential electrode with a conductive snap using dry electrodes rather than wet electrodes that proposed reliable and robust attachment for the purpose of measurement, and attaching velcro made it wearable on the forearm for bio-potential applications. Furthermore, this study proposes a recording device to store bio-potential signal data and provides portability and low-power consumption for the proposed acquisition system. To acquire differential bio-potentials, such as electrocardiogram (ECG) signals, the proposed recording device includes a low-power front-end acquisition chip fabricated using a complementary metal-oxide-semiconductor (CMOS) process, a commercial microcontroller (MSP430F149), and a secure digital (SD) card for portable healthcare applications. The proposed system can obtain ECG signals efficiently and are comfortable to the skin. The power consumption of the system is about 85 mW for continuous working over a 3 day period with two AA batteries. It can also be used as a compact Holter ECG system.
A Power-Efficient Bio-Potential Acquisition Device with DS-MDE Sensors for Long-Term Healthcare Monitoring Applications
(2010-05-01)
Chang, Chia-Lin
;
Chang, Chih-Wei
;
Huang, Hong-Yi
;
Hsu, Chen-Ming
;
Huang, Chia-Hsuan
This work describes a power-efficient bio-potential acquisition device for long-term healthcare applications that is implemented using novel microelectromechanical dry electrodes (MDE) and a low power bio-potential processing chip. Using micromachining technology, an attempt is also made to enhance the sensing reliability and stability by fabricating a diamond-shaped MDE (DS-MDE) that has a satisfactory self-stability capability and superior electric conductivity when attached onto skin without any extra skin tissue injury technology. To acquire differential bio-potentials such as ECG signals, the proposed processing chip fabricated in a standard CMOS process has a high common mode rejection ratio (C. M. R. R.) differential amplifier and a 12-bit analog-to-digital converter (ADC). Use of the proposed system and integrate simple peripheral commercial devices can obtain the ECG signal efficiently without additional skin tissue injury and ensure continuous monitoring more than 70 hours with a 400 mAh battery.
All Digital Phase-Locked Loop Using Active Inductor Oscillator and Novel Locking Algorithm
(2011)
Huang, Tzu-Chi
;
Huang, Hong-Yi
;
Liu, Jen-Chieh
;
Cheng, Kuo-Hsing
;
Luo, Ching-Hsing
A fast locking all-digital phase-locked loop (ADPLL) with the active inductor oscillator is proposed. An LC-tank DCO with a tunable active inductor can obtain a wider operational frequency range, smaller area and higher signal quality. The proposed frequency and phase locking algorithm can achieve good jitter performance, high frequency accuracy, and low circuit complexity. The ADPLL is designed using a 0.18 um CMOS process. The operational frequency range of the ADPLL is from 318 MHz to 458 MHz. The RMS and the peak-to-peak jitters at 402 MHz are 4.2 ps and 94 ps, respectively. The core size is 390x390 um(2). The power consumption is 5.4 mW at 416 MHz.
Design of Miniaturized Antenna and Power Harvester Circuit on the Enucleated Porcine Eyes
(2014-01-01)
Cheng, Hui-Wen
;
Yu, Tsung-Chi
;
Huang, Hong-Yi
;
Ting, Ssu-Han
;
Huang, Tzuen-Hsi
This letter describes a prototype of a miniaturized rectifying antenna (rectenna) design for the wireless powering of an ocular device. In contrast to the conventional on-lens loop antenna, this letter presents a loop antenna with stepped structures for optimal impedance to the rectifier. The return loss of the antenna less than -15 dB at 3 GHz is accomplished in a contact lens with a diameter ranging from 10 to 15 mm. Additionally, the radio frequency (RF) rectifier and voltage-boosting network (VBN) are optimized to enhance the power conversion efficiency (PCE) by using the voltage boosting technique. Experimental results indicate that the optimal rectifier, which is fabricated with the TSMC 0.18-mu m process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 k Omega load with an input power of +9 dBm. Moreover, the rectenna under the experiment with an enucleated porcine eye can be powered wirelessly with a transmitting device at a distance of 4 cm. The output power is 2.01 mW with a transmitting power of +32 dBm for the wireless ocular physiological monitoring (WOPM) system. Importantly, this letter demonstrates the feasibility of an optimal miniaturized on-lens rectenna design, capable of overcoming the RF power attenuation on the ocular tissue to increase the delivering distance and reduce the transmitting power.
Design of Miniaturized Antenna and Power Harvester Circuit on the Enucleated Porcine Eyes
(2014-01-01)
Cheng, Hui-Wen
;
Yu, Tsung-Chi
;
Huang, Hong-Yi
;
Ting, Ssu-Han
;
Huang, Tzuen-Hsi
This letter describes a prototype of a miniaturized rectifying antenna (rectenna) design for the wireless powering of an ocular device. In contrast to the conventional on-lens loop antenna, this letter presents a loop antenna with stepped structures for optimal impedance to the rectifier. The return loss of the antenna less than -15 dB at 3 GHz is accomplished in a contact lens with a diameter ranging from 10 to 15 mm. Additionally, the radio frequency (RF) rectifier and voltage-boosting network (VBN) are optimized to enhance the power conversion efficiency (PCE) by using the voltage boosting technique. Experimental results indicate that the optimal rectifier, which is fabricated with the TSMC 0.18-mu m process, produces a dc output voltage of 2.94 V and a conversion efficiency of 31% across a resistive 3.5 k Omega load with an input power of +9 dBm. Moreover, the rectenna under the experiment with an enucleated porcine eye can be powered wirelessly with a transmitting device at a distance of 4 cm. The output power is 2.01 mW with a transmitting power of +32 dBm for the wireless ocular physiological monitoring (WOPM) system. Importantly, this letter demonstrates the feasibility of an optimal miniaturized on-lens rectenna design, capable of overcoming the RF power attenuation on the ocular tissue to increase the delivering distance and reduce the transmitting power.
Gm-C Filter with Automatic Calibration Scheme
(2016)
Huang, Hong-Yi
;
Chen, Kun-Yuan
;
Xie, Jia-Hao
;
Lee, Ming-Ta
;
Hong, Hao-Chiao
This work presents a fifth-order OTA-C band-pass filter applying Elliptic low-pass filter and complex filter techniques. The frequency error of the filter due to the effect of process variations is induced by integrating the passive components with the operational transconductance amplifier on chip. A filter circuit with automatic calibration scheme can make the frequency less dependent on process, voltage, and temperature variations. The layout of a test chip is realized using a 0.18 um 1P6M CMOS process. Post-layout simulation demonstrates that the center frequency of the band pass filter is 450 kHz and the dynamic range is 35 dB, It has a total power consumption of 0.14mW.
Low-Voltage Indoor Energy Harvesting Using Photovoltaic Cell
(2016)
Huang, Hong-Yi
;
Yen, Shao-Zu
;
Chen, Jhen-Hong
;
Hong, Hao-Chiao
;
Cheng, Kuo-Hsing
This work presents a low-voltage indoor energy harvesting using photovoltaic cell. The system doesn\'t use a dc-dc converter to boost the output voltage so that large external inductors and large capacitors are eliminated. A rechargeable battery is connected to the output for storing the energy. No other external components are needed in the system. A test chip is implemented using a 0.18um CMOS process with a chip area of 0.85x0.85mm(2) and a power consumption of 272uW. This solar cell provides a voltage of 0.4V similar to 0.55V to the test chip at a minimum illumination of 61 similar to 625 Lux. A maximum efficiency of 54% can be obtained when the supply voltage is 0.5V.
The Novel research of Intraocular Pressure Tonometer by Using Inductance sensor
(2012)
Tang, Yu-Shun
;
Jeng, Wei-De
;
Huang, Ting-Wei
;
Ou-Yang, Mang
;
Chiou, Jin-Chern
This article mainly discusses the theoretical derivation and the estimate of the intraocular pressure (IOP) sensor by using inductance. The inductance changes associate with the variation of anterior corneal curvature radius due to the differences of IOP. The value of inductance is transformed by the LC oscillator, and the signal is transmitted by antenna, and finally read by the exterior readout circuit to achieve IOP measuring. The result show that the estimative values of inductance is close to the measured values, and the percentage of inductance variation is about 0.08% per 1 mmHg. Because of the low percentage, it makes much harder to realize readout circuit. In the future, the alteration of structure and material are considered to increase the percentage of varying inductance.