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Recent advancements in continuously scalable conversion-ratio switched-capacitor converter

Journal of Semiconductors 2024年第4期45卷 8-11页

作者： Mo Huang Yuanfei Wang Rui P.Martins Yan Lu State Key Laboratory of Analog and Mixed-Signal VLSI Institute of MicroelectronicsUniversity of MacaoMacaoChina

Switched-capacitor(SC)DC-DC converter[1]is an impor-tant alternative to inductive DC-DC converter,in terms of removing the bulky power ***,it is widely used in low-profile,low-power applications,such as the internet of things(IoT)sensor nodes and energy harvesting[2].Mean-while,considering that capacitor has a much higher energy density than inductor,high-power applications.

关键词： converter switched removing

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Rapid Discovery of Gas Response in Materials Via Density Functional Theory and Machine Learning

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Energy & Environmental Materials 2025年第1期8卷 164-172页

作者： Shasha Gao Yongchao Cheng Lu Chen Sheng Huang School of Materials Science and Physics China University of Mining and TechnologyXuzhou 221116China State-Key Laboratory of Analog and Mixed-Signal VLSI IMEUniversity of MacaoMacao 999078China

In this study,a framework for predicting the gas-sensitive properties of gas-sensitive materials by combining machine learning and density functional theory(DFT)has been *** framework rapidly predicts the gas response of materials by establishing relationships between multisource physical parameters and gas-sensitive *** order to prove its effectiveness,the perovskite Cs_(3)Cu_(2)I_(5) has been selected as the representative *** physical parameters before and after the adsorption of various gases have been calculated using DFT,and then a machine learning model has been trained based on these *** studies have shown that a single physical parameter alone is not enough to accurately predict the gas sensitivity of ***,a variety of physical parameters have been selected for machine learning,and the final machine learning model achieved 92%accuracy in predicting gas *** is important to note that although there have been no previous reports on the response of Cs_(3)Cu_(2)I_(5) to hydrogen sulfide,the resulting model predicts the gas response of H2S;it is subsequently confirmed *** method not only enhances the understanding of the gas sensing mechanism,but also has a universal nature,making it suitable for the development of various new gas-sensitive materials.

关键词： density functional theory gas-sensitive materials machine learning

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Favorable basic cells for hybrid DC–DC converters

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Journal of Semiconductors 2023年第4期44卷 10-12页

作者： Yan Lu Guigang Cai Junwei Huang State Key Laboratory of Analog and Mixed-Signal VLSI Institute of MicroelectronicsUniversity of MacaoMacaoChina

With the surging demands for extremely high current at sub-1 V supply voltage level in high performance computing and autonomous driving,high density power delivery becomes one of the critical limiting factors for system integration.48 V power bus system is emerging for these high current applications to reduce the IR losses on the power delivery ***,there is a wide voltage gap between the power bus and the digital supply rails at the point-of-load(PoL),calling for novel power conversion topologies and system *** the performances of the integrated power circuits heavily depend on both the quality factor of passive components and the figure-of-merit(FoM)of active devices,a smart circuit designer should also find an optimum way to guide the currents and to deliver the power.

关键词： system limiting autonomous

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A 79.5dB-SNDR Pipelined-SAR ADC with a Linearity-Shifting 32× Dynamic Amplifier and Mounted-Over-Die Bypass Capacitors

A 79.5dB-SNDR Pipelined-SAR ADC with a Linearity-Shifting 32...

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2023 IEEE Symposium on vlsi Technology and Circuits, vlsi Technology and Circuits 2023

作者： Zhang, Minglei Cao, Yuefeng Zhu, Yan Chan, Chi-Hang Martins, R.P. University of Macau State-Key Laboratory of Analog and Mixed-Signal Vlsi Ime Macao China

ISBN: (纸本)9784863488069

This paper presents a 32× low-noise dynamic amplifier (DA) with a linearity-shifting technique, facilitating a 15b pipelined-SAR ADC with 80 dB SNR@DC. The linearity-shifted DA decouples the fundamental conflict between the noise and linearity in conventional DAs, rending a THD below -60dB at 0.8Vpp,diff output swing. Moreover, the reference voltages are stabilized by the cost-effective mounted-over-die bypass capacitors. The 60MS/s ADC achieves 95.8dB and 87.3dB SFDR with a DC and Nyquist input, respectively, and an input noise density of 10.2nV/√Hz. © 2023 JSAP.

关键词： Cost effectiveness

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Reactive oxygen species and nitric oxide scavenging nanoparticles alleviating rheumatoid arthritis through adjusting the seeds and growing soils

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Acta Pharmaceutica Sinica B 2023年第12期13卷 5016-5029页

作者： Peng Hua Ruifeng Liang Yanbei Tu Yuying Yin Man-Kay Law Meiwan Chen State Key Laboratory of Quality Research in Chinese Medicine Institute of Chinese Medical SciencesUniversity of MacaoMacao SARChina State Key Laboratory of Analog and Mixed-Signal VLSI IME and FST-ECEUniversity of MacaoMacao SARChina

Normalizing inflamed soils including reactive oxygen species(ROS),nitric oxide(NO),cellfree DNA,and regulating infammation-related seeds such as macrophages,neutrophils,fibroblasts,represent a promising strategy to maintain synovial tissue homeostasis for rheumatoid arthritis(RA)***,ROS scavenging amphiphilic block copolymer PEGylated bilirubin and NO-scavenging PEGylated o-phenylenediamine were fabricated to self-assemble into a dually responsive nanoparticle loaded with JAK inhibitor notopterol(Not@BR/oPDA-PEG,NBOP NPs).The simultaneous ROS and NO depletion combined with JAK-STAT pathway inhibition could not only promote M2 polarization to reduce further ROS and NO generation,but also decrease cytokines and chemokines to prevent immune cell ***,NBOP NPs responded to high level ROS and NO,and disintegrated to release notopterol in inflamed joints as the hydrophobic heads BR and oPDA were transformed into hydrophilic *** released notopterol could inhibit the JAK-STAT pathway of infammatory cells to reduce the secretion of pro-inflammatory cytokines and *** strategy represented an effective way to regulate RA soils and seeds through breaking the positive feedback loop of inflammation aggravation,achieving an excellent anti-RA efficacy in a collagen-induced arthritis rat *** together,our work offered a reference to adjust RA soils and seeds for enhanced RA treatment.

关键词： Bilirubin o-Phenylenediamine Notopterol ROS and NO scavenging JAK-STATpathway Anti-inflammatory Cartilage protection Rheumatoid arthritis

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A 600-V GaN Active Gate Driver with Level Shifter Common-Mode Noise Sensing for Built-in dV/dt Self-Adaptive Control 35

A 600-V GaN Active Gate Driver with Level Shifter Common-Mod...

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35th International Symposium on Power Semiconductor Devices and ICs, ISPSD 2023

作者： Liu, Tianqi Martins, Rui P. Lu, Yan Institute of Microelectronics DECE/FST University of Macau State Key Laboratory of Analog and Mixed-Signal Vlsi 999078 China

ISBN: (纸本)9798350396829

This paper proposes a 600- V half-bridge GaN active gate driver with built-in dV/dt self-adaptive control utilizing a common-mode (CM) noise sensing and amplifying unit. The two 600- V LDMOS FETs existing in the conventional level shifter are used to sense the CM noises. When the dV/ dt rate is large enough, the sensed CM noises will be amplified and then rapidly provide a pull-down gate current for reducing the turn-on speed. As the dV/dt rate becomes smaller, the pull-down gate current will decrease adaptively, which achieving double peaks in the waveform of driving current. Compared to adding an extra high-voltage capacitor or LDMOS as a dV/dt sensor, this method has no additional area overhead and negligible control delay. At the same slew rate, we compare the low-side gate noises induced by Miller coupling at condition of either only RON or the proposed self-adaptive adjustments. It shows that the noise peak in VGL for self-adaptive control decreases 46% at VJN=300V and also the noise envelope becomes smaller due to the dV/dt adjustment, dramatically reducing the probability of shoot-through current in the half bridge. © 2023 IEEE.

关键词： Gallium nitride

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L: Efficient Linear Reconstruction Filter for Incremental Delta-Sigma ADCs

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IEEE Transactions on signal Processing 2023年 71卷 3229-3241页

作者： Wang, Bo Law, Man-Kay Schneider, Jens Hamad Bin Khalifa University College of Science and Engineering Doha34110 Qatar University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI Institute of Microelectronics and FST-ECE 999078 China

While it becomes more challenging to improve the energy efficiency of incremental delta-sigma data converters (IDCs) from the analog circuit design perspective, we propose two novel linear reconstruction filters for IDCs to enhance their performance in a digital way, including the L${}_{\mathbf{2}}$min${}^{\mathbf{2}}$ filter and its symmetric version, the L${}_{\mathbf{2}}$min${}^{\mathbf{2s}}$ filter. Compared to the classical linear reconstruction filters, such as the cascade-of-integrators (CoI) and cascaded integrator-comb (CIC) filter (an implementation of sinc filter), the proposed filters can achieve efficient quantization and thermal noise suppression, with the lowest thermal noise penalty factor of 1.2 among the high-order linear reconstruction filters. In this paper, we present analytical, numerical, and experimental results to demonstrate the superior performance of the filters for first-order and second-order IDC output reconstruction. The proposed filters are hardware-friendly and example digital implementations in a standard complementary metal-oxide-semiconductor (CMOS) and field-programmable gate array (FPGA) platforms are included in this paper. © 1991-2012 IEEE.

关键词： Energy efficiency

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A 0.4-V 8400-μm2 Voltage Reference in 65-nm CMOS Exploiting Well-Proximity Effect

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IEEE Transactions on Circuits and Systems II: Express Briefs 2023年第10期70卷 3822-3826页

作者： Che, Chengyu Lei, Ka-Meng Martins, Rui P. Mak, Pui-In University of Macau State Key Laboratory of Analog and Mixed-Signal VLSI Institute of Microelectronics and the Department of ECE Faculty of Science and Technology China Instituto Superior Técnico Universidade de Lisboa Lisbon1649-004 Portugal

This brief exploits, for the first time, the well-proximity effect to develop a sub-0.5 V voltage reference with a high power-supply rejection ratio (PSRR) and a compact area. The layout-dependent effect (LDE) is deemed to affect the matching and characteristics of analog circuits in the deep-submicron CMOS process. Here we explore the LDE effect in designing analog circuits, by exemplifying it with a CMOS voltage reference. Validated in 65-nm CMOS, the voltage reference occupies 8, 400~μ m2 and outputs a reference of 107.2 mV at a V_ DD of 0.4 V, with a power of 56.7 nW. The temperature coefficient is 79.4 ppm/°C across -20 to 80 °C (average of 12 samples) after a two-point batch trimming and scores a high PSRR of -66.5 dB. The standard deviation of 12 chips is 2.6 mV, evincing the robustness of the voltage reference exploiting the LDE. © 2004-2012 IEEE.

关键词： Threshold voltage

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A 124-to-152-GHz Power Amplifier Exploiting Chebyshev-Type Two-Section Wideband and Low-Loss Power-Combining Technique in 28-nm CMOS

A 124-to-152-GHz Power Amplifier Exploiting Chebyshev-Type T...

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作者： Zhang, Jincheng Wang, Yujia Chen, Yong Ren, Junyan Ma, Shunli Fudan University State Key Laboratory of Asic and System Shanghai200433 China University of Macau State-Key Laboratory of Analog and Mixed-Signal Vlsi and IME/ECE-FST China

This article presents a high-power wideband power amplifier (PA) with a four-way power-combining technique for $D$ -band high-resolution radar. The power combiner is based on a two-section Chebyshev impedance converter to achieve a large bandwidth (BW) and is realized with slow wave coplanar waveguides (S-CPWs) to reduce the insertion loss and chip area. Therefore, our developed technique can provide broadband and low-loss power-combining scheme in a very compact size. A high-power PA with four-way combining has been fabricated in a 28-nm CMOS bulk technology. The unit PA uses low- $k$ transformer-based coupled-resonator networks to realize wideband matching. The measured results of the PA prototype demonstrate the peak gain of 22.6 dB, the saturated output power of 16.2 dBm, and the peak power added efficiency of 8.6% at 135 GHz with a 3-dB BW of 28 GHz from 124 to 152 GHz. Meanwhile, the total area of this PA die is merely 0.66 $\times $ 0.73 mm. © 1963-2012 IEEE.

关键词： Power amplifiers

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Model Predictive Robust Control for A Capacitive-Coupling Grid-Connect Inverter (CGCI) in Power Quality Compensation 50

Model Predictive Robust Control for A Capacitive-Coupling Gr...

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50th Annual Conference of the IEEE Industrial Electronics Society, IECON 2024

作者： Chan, Pak-Ian Sou, Wai-Kit Lam, Chi-Seng State Key Laboratory of Analog and Mixed-Signal VLSI University of Macau China Institute of Microelectronics University of Macau China Department of Electrical and Computer Engineering Faculty of Science and Technology University of Macau China

ISBN: (纸本)9781665464543

In this paper, a model predictive robust control (MPRC) is proposed for a three-phase capacitive-coupling grid-connect inverter (CGCI) to improve the power quality compensation performance under deviating system parameters. A detail stability study and parameter design of the proposed MPRC is provided, while the robustness and power quality compensation performance of the proposed MPRC are verified by the simulation in comparison to the conventional model predictive control (MPC). © 2024 IEEE.

关键词： Predictive control systems

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