Browsing by Author "Huang, Chung-Ping"

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A 0.325 V, 600-kHz, 40-nm 72-kb 9T Subthreshold SRAM with Aligned Boosted Write Wordline and Negative Write Bitline Write-Assist
(2015-05-01)
Lu, Chien-Yu
;
Chuang, Ching-Te
;
Jou, Shyh-Jye
;
Tu, Ming-Hsien
;
Wu, Ya-Ping
This brief presents a two-port disturb-free 9T subthreshold static random access memory (SRAM) cell with independent single-ended read bitline and write bitline (WBL) and cross-point data-aware write structure to facilitate robust subthreshold operation and bit-interleaving architecture for enhanced soft error immunity. The design employs a variation-tolerant line-up write-assist scheme where the timing of area-efficient boosted write wordline and negative WBL are aligned and triggered/initiated by the same low-going global WBL to maximize the write-ability enhancement. A 72-kb test chip is implemented in United Microelectronics Corp. 40-nm low-power (40LP) CMOS. Full functionality is achieved for V-DD ranging from 1.5 to 0.32 V without redundancy. The measured maximum operation frequency is 260 MHz (450 kHz) at 1.1 V (0.32 V) and 25 degrees C. At 0.325 V and 25 degrees C, the chip operates at 600 kHz with 5.78 mu W total power and 4.69 mu W leakage power, offering 2x frequency improvement compared with 300 kHz of our previous 72-kb 9T subthreshold SRAM design in the same 40LP technology. The energy efficiency (power/frequency/IO) at 0.325 V and 25 degrees C is 0.267 pJ/bit, a 23.7% improvement over the 0.350 pJ/bit of our previous design.
All Inorganic Perovskite Quantum Dots Hybrid Green Light-Emitting Diode with Stable Performance
(2018-01-01)
Yu, Chung-Ping
;
Chung, Meng-Ting
;
Chen, Tzu-Yu
;
Huang, Yu-Ming
;
Huang, Chung-Ping
A silica-coated inorganic perovskite quantum dot hybrid light-emitting diodes is aged continuously in high and low light intensity conditions. Both blue and ultra-violet-pumped samples showed stable performances up to 104 hours.
An Investigation on Stable and Continuous Operation of Hybrid Perovskite Quantum Dot Light Emitting Diodes
(2019-01-01)
Cho, Yu-Yun
;
Hsu, Shun-Chieh
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Huang, Yu-Ming
;
Shih, Hsiang-Yun
;
Lee, Ting-Yu
Two different package structures of hybrid perovskite quantum dots light emitting diodes were demonstrated with stable and continuous light emission. With boron nitride nanoparticles, the lifetime of device is expected to be thousands of hours.
Evaluation of Luminescent Downshifting Effect of Perovskite Quantum Dots on Semiconductor Solar Cells
(2018-01-01)
Chen, Chun-Hong
;
Yu, Chung-Ping
;
Huang, Yu-Ming
;
Chan, Yueh-Lin
;
Huang, Chung-Ping
The luminescent down-shifting effect of the perovskite quantum dots on single junction GaAs solar cells are examined and discussed. The perovskite quantum dots can provide an effective way to convert ultra-violet photons in solar spectrum to visible ones which can be transformed into electron-hole pairs more efficiently. Three different designs are tried: direct-dispense, ITO nano-whisker up and ITO nano-whisker down. In this experiment, we use perovskite quantum dots(QDs) with the concentration of 1mg/ml and emit photons of the wavelength 530nm (CsPbBr3), and the various volume of perovskite QDs were deposited on the solar cell to observe the possible luminescent down-shifting phenomenon.
High performance ultraviolet micro-LED arrays for fine-pitch micro displays
(2019-01-01)
Tsai, Yi-Lin
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Huang, Yu-Ming
;
Yang, Shu-Mei
;
Kuo, Wei-Hung
;
Fang, Yen-Hsiang
Highly efficient ultraviolet micro LED arrays are demonstrated. Small devices (5 microns in size) suitable for high resolution (725 ppi) can be produced with low leakage current and good emission spectra stability. A 10 by 10 array is achieved with passive-matrix driving connection.
Microwave behavior of a monolithic dual-wavelength DFB laser based on current model
(2020-09-15)
Huang, Chung-Ping
;
Huang, Yu-Ming
;
Hwang, Yi-Chia
;
Dong, Yao-Zhong
;
Hsu, Shun-Chieh
A driving current based model describing the optical heterodyne output of a monolithic dual-wavelength DFB laser is established. The linear relationship between the driving current and the laser output wavelength was applied to obtain the simple equation for this purpose. Actual measured data from the real devices were used for the initial parameter extraction and the practical model can then be built. By using this model, the influence of different laser parameters towards the radio frequency signal generation and different current configuration on the output characteristic can be demonstrated. This can facilitate the future design of such integrated photonic devices.
Microwave Spectral Characteristics of the Three-Section Distributed Feedback Lasers
(2018-01-01)
Chen, Chun-Hong
;
Hsiao, Fu-Chun
;
Dong, Yao-Zhong
;
Chan, Yueh-Lin
;
Chen, Yi-Hsun
The three-section DFB lasers are used for RF signal generation. With an extra section, it can lime the RF peak frequency farther than the two-section one, and can also simultaneously generate two single-mode RF signals.
The Aging Study for Fine Pitch Quantum-Dot Array on LEDs
(2019-01-01)
Huang, Yu-Ming
;
Liang, Kai-Ling
;
Cho, Yu-Yun
;
Hsu, Shun-Chieh
;
Kuo, Wei-Hung
In this paper, we fabricated the photoresist mold whose pitch is smaller than 15. m on light-emitting diode and printed two different cadmium-based quantum dots. Also, we burn-in the LED to compare their lifetime which are pasted barrier film by two different methods. (C) 2019 The Author(s)
The Photothermal Stability Study of Quantum Dots Embedded in Sodium Chlorides
(2020-01-01)
Huang, Yu-Ming
;
Hsu, Shun-Chieh
;
Li, Ning
;
Yu, Chung-Ping
;
Ke, Li-Ann
An efficient and useful method for the incorporation of colloidal quantum dots (QDs) into ionic matrices is demonstrated. We prepared three different synthesis methods, which are traditional saturated-salt water, methanol-assisted, and ethanol-assisted methods. The continuous thermal and photonic stress tests indicate that the high temperature, instead of photonic excitation stress, is more detrimental to the illumination capability of the quantum dots. While the traditional saturated-salt water synthesis and methanol-assisted method are quite effective in low temperature and low photon excitation intensity, the quantum dots sealed by the ethanol-assisted method cannot hold under all conditions. An over-1000-h aging test can provide crucial information for the longevity of these quantum dots, and more than 10,000 h of lifetime can be expected.
Thermal Characteristics of the Three-Section Distributed Feedback Lasers
(2019-01-01)
Huang, Chung-Ping
;
Shih, Hsiang-Yun
;
Chang, Shu-Hsiu
;
Hsu, Shun-Chieh
;
Cheng, Yuh-Jen
Three-section DFB laser was used to compare thermal effect to red shift. Measurement results showed 0.075nm/degrees C. Simulation results were compared between the measured and calculation of this three-section device.
Widely Tunable Single/Dual RF Signal Generation by a Monolithic Three-Section DFB Laser
(2020-04-17)
Huang, Chung-Ping
;
Huang, Yu-Ming
;
Shih, Hsiang-Yun
;
Hsiao, Fu-Chun
;
Chen, Chun-Hong
A three-section distributed feedback laser with a 2.5 InP/air pair of distributed Bragg reflectors (DBRs) was fabricated and analyzed in terms of its microwave generation capability. A widely tunable single radio frequency (RF) signal can be detected using optical heterodyning, and the tuning range is from 2 to 45 GHz. The incorporation of the third section provides an opportunity to present the dual RF operation when three emission peaks are near to each other in the wavelength domain. The proposed design provides a 21.3% enhancement in the RF tuning range compared with the range of a two-section laser (35.29 GHz versus 42.81 GHz). The compactness of the proposed device can be useful for future radio-over-fiber applications.