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Sinha, Abhishek (author), Mehta, P.P. (author), Fan, Chuannan (author), Zhang, Jing (author), Marvin, Dieuwke L. (author), van Dinther, Maarten (author), Ritsma, Laila (author), Boukany, P. (author), ten Dijke, Peter (author)
Epithelial to mesenchymal transition (EMT) is crucial during embryonic development, tissue fibrosis, and cancer progression. Epithelial cells that display a cobblestone-like morphology can undergo a switch to mesenchymal-like phenotype, displaying an elongated spindle shape or a fibroblast-like morphology. EMT is characterized by timely and...
book chapter 2022
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Lu, G. (author), Fan, Xuejun (author), Fan, Jiajie (author), Zhang, Kouchi (author)
Color stability is of major concern for LED-based products. Currently, much effort is done on lumen maintenance, and for color shift, no agreed method currently exists, be it from testing or from prediction side. To investigate the physics of color shift, we present experiments of each individual part failure of each individual part that are...
book chapter 2018
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Sun, B (author), Fan, Xuejun (author), Zhang, Kouchi (author)
This chapter investigates the reliability of the integrated LED lamps with electrolytic capacitor-less LED drivers. Firstly, the impact of the interaction between the degradations of the LED light source and the driver on the lumen depreciation is studied. The electronic-thermal simulation was carried out to obtain the history of temperatures of...
book chapter 2018
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van Driel, W.D. (author), Yazdan Mehr, M. (author), Fan, X. J. (author), Zhang, Kouchi (author)
In the foregoing chapters, the reliability of organic compounds in microelectronics and optoelectronics was discussed. It provided a state of the art in reliability concepts for materials used in electronic products. It also enlightened the direction in reliability concepts for these products. In this chapter, we discuss the outlook where we...
book chapter 2022
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Zhang, H. (author), Berkhout, Marco (author), Makinwa, K.A.A. (author), Fan, Q. (author)
Class-D amplifiers (CDAs) are widely used in audio applications where a high power efficiency is required. As most audio sources are digital nowadays, implementing digital-input CDAs results in higher levels of integration and lower cost. However, prior open-loop digital-input CDAs suffer from high jitter sensitivity and output-stage...
conference paper 2023
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Chen, Minggang (author), Zhang, H. (author), Fan, Q. (author)
Silicon MOSFETs-based medium-power (< 50W) Class-D amplifiers (CDAs) switching in the MHz range have gained popularity in recent years, which achieves better linearity thanks to a higher loop gain in the audio band while enabling the use of LC filters with higher cut-off frequencies. However, for high-power (>100 W) CDAs, such switching...
conference paper 2023
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Karmakar, S. (author), Zhang, H. (author), Berkhout, Marco (author), Fan, Q. (author)
This paper presents a Class-D piezoelectric speaker driver that employs a quadrature feedback chopping scheme (QCS). Compared to a conventional single feedback chopping scheme (SCS), the use of QCS can eliminate the timing skew between low-voltage (LV) and high-voltage (HV) choppers, greatly improving large-signal linearity. A prototype...
conference paper 2023
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Cui, Z. (author), Fan, X. (author), Zhang, Kouchi (author)
In this paper, we apply the Eshelby's solution to study the effect of passivation layer on electromigration (EM) failure in a conductor. The passivation layer is considered as an elastic material, not a rigid layer anymore. Thus, the deformation and stress evolution in the conductor during EM are related to the mechanical property of the...
conference paper 2023
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Chen, Wei (author), Yan, Xuyang (author), Ibrahim, Mesfin S. (author), Meda, Abdulmelik H. (author), Fan, X. (author), Zhang, Kouchi (author), Fan, J. (author)
As the next generation of semiconductor devices, SiC MOSFETs have demonstrated significant performance improvements in switching loss, switching frequency, and high-temperature operation compared to Si-based MOSFETs. However, the long-term reliability of such devices and their packaging continues to be a major concern. Towards addressing this...
conference paper 2023
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Liu, Minne (author), Ibrahim, Mesfin S. (author), Wen, Minzhen (author), Li, Sheng (author), Wang, An (author), Zhang, Kouchi (author), Fan, J. (author)
Spectral power distribution (SPD) is the radiation power intensity at different wavelengths, containing the most basic photometric and colorimetric performance of the illuminant, which is able to predict the lifetime of LEDs. This paper proposes an SPD model assisted by machine learning algorithms to detect the early failure of white LEDs. The...
conference paper 2023
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Zhang, H. (author), Berkhout, M. (author), Makinwa, K.A.A. (author), Fan, Q. (author)
This paper reports a Class-D audio amplifier that uses multiloop feedback to suppress output LC filter nonlinearity by 49 dB, enabling the use of small, low-cost LC filters with ±30% spread while maintaining low distortion. Fabricated in a 180 nm BCD process, the prototype achieves a THD of-121.5 dB and a THD+N of-107.1 dB. It delivers 12W...
conference paper 2021
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Fan, Jiajie (author), Qian, Yichen (author), Chen, Wei (author), Jiang, Jing (author), Tang, Zhuorui (author), Fan, Xuejun (author), Zhang, Kouchi (author)
A fan-out panel-level packaging (FOPLP) with an embedded redistribution layer (RDL) via interconnection reduces the size, thermal resistance, and parasitic inductance of power module packaging. In this study, the effect of the RDL via size on the reliability of a FOPLP SiC MOSFET power module was investigated. To improve the thermal management...
conference paper 2022
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Cui, Z. (author), Fan, X. (author), Zhang, Kouchi (author)
In this paper, a 3D and fully coupled electromigration modeling is implemented using COMSOL. The fully coupled multi-physics theory has a unique set of partial differential equations, which cannot be directly simulated with the standard finite element software such as ABAQUS and ANSYS. With the weak form PDE modulus in COMSOL, the weak form of...
conference paper 2022
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Zhang, H. (author), Rozsa, N.N.M. (author), Berkhout, Marco (author), Fan, Q. (author)
This paper reports a chopper Class-D audio amplifier that obtains high PSRR over the entire audio band. A chopping scheme is proposed to minimize intermodulation distortion between pulse-width modulation (PWM) and chopping in the audio band. A high-voltage chopper is developed to handle a 14.4 V PWM signal. Timing matching techniques are...
conference paper 2021
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Cui, Z. (author), Fan, Xuejun (author), Zhang, Kouchi (author)
This paper investigates thermomigration (TM) and electromigration (EM) in SWEAT structure. Firstly, the distribution of temperature along SWEAT structure during EM is obtained by using finite element (FE) simulation. The FE simulation results show that the temperature is almost uniformly distributed in the most region of narrow line in SWEAT...
conference paper 2023
document
Wen, Minzhen (author), Guo, Baotong (author), Chen, Shanghuan (author), Hu, X. (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, J. (author)
The (Ca, Sr) AlSiN₃:Eu²⁺(CSASN:Eu) red phosphor is widely used to improve color rendering of high-power phosphor-converted lighting diode (pc-WLED), but it is always unstable under high temperature and high humidity environments. Therefore, the studies on the temperature and humidity resistance of red phosphors and their aging mechanism have...
conference paper 2023
document
Hu, D. (author), Li, Z. (author), Fan, J. (author), Zhang, Kouchi (author)
As a critical part of speeding up industrial electrification, power electronics, and its packaging technology are undergoing rapid development. Cu nanoparticle sintering technology has therefore received extensive attention for its excellent performance in the die-attachment layer, where the mechanical properties are essential to be known for...
conference paper 2023
document
Qian, Cheng (author), Hu, D. (author), Liu, Xu (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, J. (author)
Nano-metal materials sintering has received increasing attention in recent years for its promising performance in the wide bandgap semiconductor packaging. In this paper, molecular dynamics (MD) simulation method were applied to simulate the nano-Cu sintering mechanism and the subsequent mechanical behavior. Hybrid sintering, comprising...
conference paper 2023
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Tang, Zhuorui (author), Tian, Jing (author), Mao, Chaobin (author), Zhang, Nan (author), Huang, Jiyu (author), Fan, J. (author), Zhang, Kouchi (author)
Silicon carbide (SiC) epitaxial process is a key step in the fabrication of power devices, and the temperature field inside the reactor chamber plays an essential role in this process. In this paper, the temperature field in the horizontal chemical-vapor-deposition reactor chamber used for growing homo-epitaxial 4H-SiC material is studied using...
conference paper 2023
document
Karmakar, S. (author), Zhang, H. (author), Van Veldhoven, Robert (author), Breems, Lucien (author), Berkhout, M. (author), Fan, Q. (author), Makinwa, K.A.A. (author)
Class-D amplifiers are often used in high-power audio applications due to their high power efficiency. They typically employ pulse-width modulation (PWM) at a fixed carrier frequency, which may cause electromagnetic interference (EMI). Setting this frequency f<sub>PWM</sub>) below the AM band (535 to 1605kHz) helps mitigate this, but its...
conference paper 2020
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