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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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A -109.1 dB/-98 dB THD/THD+N Chopper Class-D Amplifier with >83.7 dB PSRR Over the Entire Audio BandZhang, 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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Jiang, Peng (author), Fu, Xiuju (author), Fan, Yee Van (author), Klemeš, Jiří Jaromír (author), Chen, P. (author), Ma, Stefan (author), Zhang, Wanbing (author)Coronavirus disease-2019 (COVID-19) poses a significant threat to the population and urban sustainability worldwide. The surge mitigation is complicated and associates many factors, including the pandemic status, policy, socioeconomics and resident behaviours. Modelling and analytics with spatial-temporal big urban data are required to assist...journal article 2021
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Hu, D. (author), Gu, Tijian (author), Cui, Z. (author), Vollebregt, S. (author), Fan, Xuejun (author), Zhang, Kouchi (author), Fan, J. (author)In high power electronics packaging, sintered silver nanoparticle joints suffer from thermal-humidity- electrical-chemical joint driven corrosion in extreme environments. In this paper, we conducted aging tests on sintered silver nanoparticles under high-temperature, high-humidity, and high-sulphur conditions. The results show that: (1) the...journal article 2021
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Cui, Z. (author), Fan, J. (author), van Ginkel, H.J. (author), Fan, Xuejun (author), Zhang, Kouchi (author)The CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> red phosphor and its silicone/phosphor composite are very promising materials used in the high color rendering white light-emitting diode (LED) packaging. However, the reliabilities of CaAlSiN<sub>3</sub>:Eu<sup>2+</sup> and its composite are still being challenged by phosphor hydrolysis at high...journal article 2020
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Fan, J. (author), Chen, Wei (author), Yuan, Weiyi (author), Fan, X. (author), Zhang, Kouchi (author)Light-emitting diode (LED) arrays have attracted increased attention in the area of high power intelligent automotive headlamps because of their superiority in disposing of the power limit of an individual LED package and controllably luminous intensity and illumination pattern. The optical and chromatic performances of an LED array do not...journal article 2020
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Fan, J. (author), Li, Yutong (author), Fryc, Irena (author), Qian, C. (author), Fan, X. (author), Zhang, Kouchi (author)The full-spectrum white light-emitting diode (LED) emits light with a broad wavelength range by mixing all lights from multiple LED chips and phosphors. Thus, it has great potentials to be used in healthy lighting, high resolution displays, plant lighting with higher color rendering index close to sunlight and higher color fidelity index. The...journal article 2020
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Zhang, H. (author), Karmakar, S. (author), Breems, Lucien J. (author), Sandifort, Quino (author), Berkhout, Marco (author), Makinwa, K.A.A. (author), Fan, Q. (author)This article presents a Class-D audio amplifier for automotive applications. Low electromagnetic interference (EMI) and, hence, smaller LC filter size are obtained by employing a fully differential multilevel output stage switching at 4.2 MHz. A modulation scheme with minimal switching activity at zero input reduces idle power, which is...journal article 2020
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Karmakar, S. (author), Zhang, H. (author), van Veldhoven, Robert (author), Breems, Lucien J. (author), Berkhout, M. (author), Fan, Q. (author), Makinwa, K.A.A. (author)This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ Σ M-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed...journal article 2020
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Yang, Shangyu (author), Zhang, Renren (author), Wang, Jianjun (author), Li, Xinhong (author), Fan, Heng (author), Yang, M. (author)Ultra-deep oil and gas wells have become a new development trend in onshore oil and gas exploitation. However, Ultra-deep oil and gas wellbore casing is with high failure risk due to the harsh environment. It is essential to evaluate the reliability of wellbore casing. This paper assesses the operational reliability of wellbore casing using...journal article 2020
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Fan, J. (author), Wu, Jie (author), Jiang, Changzhen (author), Zhang, H. (author), Ibrahim, M.S. (author), Deng, Liang (author)To make the light-emitting diode (LED) more compact and effective, the flip chip solder joint is recommended in LED chip-scale packaging (CSP) with critical functions in mechanical support, heat dissipation, and electrical conductivity. However, the generation of voids always challenges the mechanical strength, thermal stability, and...journal article 2020
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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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Hou, F. (author), Zhang, Hengyun (author), Huang, Dezhu (author), Fan, J. (author), Liu, Fengman (author), Lin, Tingyu (author), Cao, Liqiang (author), Fan, Xuejun (author), Ferreira, Braham (author), Zhang, Kouchi (author)In this article, a microchannel thermal management system (MTMS) with the two-phase flow using the refrigerant R1234yf with low global warming potential is presented. The thermal test vehicles (TTVs) were made of either single or multiple thermal test chips embedded in the substrates, which were then attached to the MTMS. The system included...journal article 2020
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Fan, B. (author), Zhang, K. (author), Liu, Q. (author), Eelkema, R. (author)Introduction of dynamic thiol-alkynone double addition cross-links in a polymer network enable the formation of a self-healing injectable polymer hydrogel. A four-arm polyethylene glycol (PEG) tetra-thiol star polymer is cross-linked by a small molecule alkynone via the thiol-alkynone double adduct to generate a hydrogel network under ambient...journal article 2020
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Zhang, Y. (author), Wang, Xuancang (author), Ji, Guanyu (author), Fan, Zhenyang (author), Guo, Yuchen (author), Gao, Wenze (author), Xin, Lei (author)Lignin, as a bio-based waste, has been utilized in the asphalt industry due to various advantages. This study aimed to investigate the effects of two lignin products (lignin powder and lignin fiber) on the mechanical properties of asphalt mixtures. The raveling, rutting, thermal and fatigue cracking resistance, and moisture susceptibility of...journal article 2020
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Yazdan Mehr, M. (author), Bahrami, A. (author), van Driel, W.D. (author), Fan, X.J. (author), Davis, J.L. (author), Zhang, Kouchi (author)In this paper, degradation mechanisms of optical materials, used in the light emitting diode (LED)-based products, are reviewed. The LED lighting is one of the fastest technology shifts in human history. Lighting accounts for almost 20% of the global electrical energy use, inferring that replacement of traditional lighting sources with LEDs...journal article 2020
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Cui, Z. (author), Fan, Xuejun (author), Zhang, Kouchi (author)In this paper, a recently developed theory - general coupling model of electromigration, is implemented in ANSYS. We first identify several errors provided in ANSYS manual for electromigration modeling. Then the general coupling model is implemented in ANSYS and the detailed description is presented. Finally, a 1-D confined metal line with a...conference paper 2020
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Zhang, H. (author), Karmakar, S. (author), Breems, Lucien (author), Sandifort, Quino (author), Berkhout, M. (author), Makinwa, K.A.A. (author), Fan, Q. (author)This paper describes a class-D audio amplifier with a multilevel output stage that reduces both EMI and idle power. High loop gain, and thus high linearity, are enabled by a relatively high (4.2 MHz) switching frequency, which relaxes the requirements on its output LC filter. Fabricated in a 180nm BCD technology, it can drive 14 W into an 8-Ω...conference paper 2020
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Hu, D. (author), Cui, Z. (author), Fan, J. (author), Fan, X. (author), Zhang, Kouchi (author)A molecular dynamics (MD) simulation was performed on the coalescence kinetics and mechanical behavior of the pressure-assisted Cu nanoparticles (NPs) sintering at low temperature. To investigate the effects of sintering pressure and temperature on the coalescence of the nanoparticles, sintering simulations of two halve Cu NPs were conducted at...journal article 2020
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Tang, H. (author), Sacco, L.N. (author), Vollebregt, S. (author), Ye, H. (author), Fan, Xuejun (author), Zhang, Kouchi (author)2D and nanostructured metal sulfide materials are promising in the advancement of several gas sensing applications due to the abundant choice of materials with easily tunable electronic, optical, physical, and chemical properties. These applications are particularly attractive for gas sensing in environmental monitoring and breath analysis....review 2020