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16th Pacific Rim Conference on Lasers and Electro-Optics, CLEO-PR 2024

作者： Tang, Jianwei Yang, Bang Wei, Jinlong Cheng, Chen Hao, Yaguang Wu, Qi Wang, Jianyu Liang, Junpeng Xu, Zhaopeng Sun, Zhongliang Yang, Yanfu Hu, Weisheng Peng Cheng Laboratory Department of Circuits and System Shenzhen518000 China School of Integrated Circuits Harbin Institute of Technology Shenzhen518000 China

A novel low-complexity and multiplication-free baud-rate timing phase error detector for high-speed IM/DD optics is proposed. Its superior performance is validated by experimental demonstration of 50 Gbaud PAM4 and PA... 详细信息

ISBN: (纸本)9798350372076

关键词： Timing devices

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In-memory computing based on phase change memory for high energy efficiency

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Science China(Information Sciences) 2023年第10期66卷 20-41页

作者： Luchang HE Xi LI Chenchen XIE Zhitang SONG National Key Laboratory of Materials for Integrated Circuits Shanghai Institute of Micro-System and Information Technology Chinese Academy of Sciences School of Microelectronics University of Science and Technology of China

The energy efficiency issue caused by the memory wall in traditional von Neumann architecture is difficult to reconcile. In-memory computing(CIM) based on emerging nonvolatile memory(NVM) is a promising solution to avoid data movement between storage and processors and realize highly energy-efficient computing. Compared with other NVM technologies, phase change random access memory(PCM) exhibits comprehensive performance for analog computing. In this paper, we review advanced PCM techniques,including phase-change materials, mechanisms, and unique properties, as a foundation and inspiration for implementing CIM architecture. Meanwhile, state-of-the-art PCM-based CIM systems are well discussed for high energy efficiency in artificial neural networks, spiking neural networks, and other artificial intelligence(AI) applications. Finally, we present the remaining challenges and potential solutions of CIM for further investigation.

关键词： in-memory computing phase change memory energy efficiency neural network memory wall

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Design memristor-based computing-in-memory for AI accelerators considering the interplay between devices, circuits, and system

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Science China(Information Sciences) 2023年第8期66卷 243-253页

作者： Junjie AN Linfang WANG Wang YE Weizeng LI Hanghang GAO Zhi LI Zhidao ZHOU Jinghui TIAN Jianfeng GAO Chunmeng DOU Qi LIU School of Microelectronics University of Science and Technology of China State key Lab of Fabrication Technologies for Integrated Circuits Institute of MicroelectronicsChinese Academy of Sciences School of Microelectronics University of Chinese Academy of Sciences Frontier Institute of Chip and System State Key Laboratory of ASIC and System Fudan University

Recent advances in developing beyond von Neumann architectures have moved the memristive devices to the forefront as one of the key enablers to realizing memristive computing-in-memory(m CIM)structures, which shows a great promise to boost the energy-efficiency and the performance of artificial intelligence(AI) chips. In this study, by considering the interactions between devices, circuits, and systems in the m CIM design, we propose several cross-layer design techniques, including(1) the BL-SL interactive forming protection(BSIFP) circuit that can reduce the voltage drop on the selected transistor, suppress the current overshoot by 65.96%, and improve the bit-cell density by more than 10.19%,(2) the clamping transistor trimming scheme(CTTS) to prevent the multiply-and-accumulate(MAC) signal margin degradation from chip-to-chip resistance variations, and(3) dynamic input-parallelism and output-precision(DIPOP) that can reduce the energy cost by 22.92% in a typical inference task with negligible accuracy loss. The results demonstrate the significant role of the cross-layer-interactive approach and provide a preliminary guideline for highly-efficient m CIM design.

关键词： memristor resistive memory computing-in-memory artificial intelligence cross-layer co-design

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A Novel Coprime Nested Array with Enhanced DOFs and Reduced Mutual Coupling for DOA Estimation of Noncircular Sources

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IEEE Transactions on Vehicular Technology 2025年 1-13页

作者： Peng, Zhe Gong, Qishu Xie, Huikai School of Integrated Circuits and Electronics Beijing100081 China BIT Chongqing Institute of Microelectronics and Microsystems Chongqing401332 China Beijing Institute of Control and Electronics Technology Key Laboratory of Information System and Technology Beijing100038 China

Recently, many sparse array configurations have been designed for direction of arrival (DOA) estimation of noncircular sources due to their capability of constructing high-performance difference-sum coarray. Nested array, coprime array, along with their improved structures are the most commonly used array configurations. Nested arrays could provide O(R2) degrees of freedom (DOFs) with only R sensors, but suffer from severe mutual coupling effect owing to closely arranged elements. Coprime arrays generally offer a lower number of DOFs than nested arrays, but are more robust to mutual coupling effect due to sparser array structure. Unfortunately, existing sparse arrays cannot possess the benefits of nested arrays and coprime arrays at the same time within the framework of difference-sum coarray. To compensate for the above shortcoming, we first analyze the nesting property for difference coarray, and generalize the nesting property to difference-sum coarray, allowing nearly half of the sensors to be removed from dense subarray. Then, a new nested configuration called thinned coprime nested array (TCNA) is proposed, whose dense subarray is a coprime structure that satisfies the aforementioned nesting property. TCNA can generate a comparable number of DOFs to nested arrays due to the nesting property between two subarrays. Meanwhile, the mutual coupling effect is greatly reduced since its dense subarray is replaced with a coprime structure, which limits the number of sensor pairs with small spacing. Therefore, TCNA is able to combine the advantages of both nested array and coprime array. Finally, simulations verify the superiority of TCNA with respect to DOF ratio, coupling leakage, and DOA estimation accuracy. © 1967-2012 IEEE.

关键词： Direction of arrival

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Study on the aerodynamic characteristics of reentry capsule with obtuse head inverted cone under hypersonic chemical nonequilibrium flow

Study on the aerodynamic characteristics of reentry capsule ...

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2024 International Conference on Aerospace and Mechanics, ICAM 2024

作者： Sun, Bin Chen, Weiyue Huang, Cai Long, Yin Diao, Weihe Zhang, Huiwen Beijing Institute of Spacecraft System Engineering Beijing100094 China School of Integrated Circuits and Electronics Beijing Institute Technology University Beijing100081 China

During spacecraft reentry, the aerodynamic characteristics of the reentry capsule with a sizeable obtuse head inverted cone (OBHIC) in a hypersonic state are the key factors in the design of controlled reentry trajectory, the design of trim angle of attack (AoA), and the accuracy of fall point of capsules. This paper establishes a numerical simulation algorithm of a hypersonic chemical nonequilibrium flow field by considering high-temperature real gas effects. The reentry capsule's aerodynamic and flow field characteristics are predicted and analyzed. The component transport equations for chemical reactions are added to the Navier-Stokes equations, enabling precise modeling of gas molecule vibrational excitation and ionization processes. A half-model multi-block structured mesh is employed to construct the aerodynamic profile of the reentry capsule with OBHIC. The aerodynamic characteristics and pressure distribution of the reentry capsule were calculated and analyzed under the typical conditions of flight altitude of 40~80 km, flight velocity of 6~27 Ma, and AoA of 15°~24°. The results of the aerodynamic characteristics prediction show that the aerodynamic characteristics of the reentry capsule are little affected by the incoming flow velocity in a hypersonic state but significantly affected by the AoA. As the AoA increases, the lift coefficient CL increases linearly, the drag coefficient CD decreases linearly, the lift-to-drag ratio K rises linearly, and K increases from 0.19 to 0.29. In its hypersonic state, the reentry capsule exhibits a low lift-to-drag ratio, characterized by high drag and low lift coefficients. The results of this paper play an essential role in the reentry flight dynamics and reentry trajectory design of the reentry capsule. Moreover, it can further ensure the safety and reliability of the reentry flight of spacecraft. © 2024 institute of Physics Publishing. All rights reserved.

关键词： Angle of attack

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A 67F2 Reconfigurable PUF Using 1T2R RRAM Switching Competition in 28nm CMOS with 5e-9 Bit Error Rate

A 67F2 Reconfigurable PUF Using 1T2R RRAM Switching Competit...

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2024 IEEE Symposium on VLSI Technology and circuits, VLSI Technology and circuits 2024

作者： Cao, Yue Yang, Honghu Yang, Jianguo Liu, Qi Liu, Ming Frontier Institute of Chip and System Fudan University Shanghai China Zhangjiang Laboratory Shanghai China State Key Laboratory of Fabrication Technologies for Integrated Circuits Institute of Microelectronics Chinese Academy of Sciences Beijing China

ISBN: (纸本)9798350361469

Aiming at low-cost, high-reliability hardware security in IoT applications, we demonstrated a 1Mb 1T2R RRAM Reconfigurable PUF design. A 1T2R PUF cell with a smaller size utilizes the switch time variation in the RRAM device as the entropy source, and an initialization-extraction process that exploits the cycle-to-cycle switch time variation is proposed to enable PUF reconfiguration. A self-adaptive extraction circuit and a reprogram calibration scheme are designed to improve operation power and native BER. Moreover, a symmetrical read scheme is employed to enhance power analysis resilience, by balancing the power during PUF readout. The test chip achieves a cell size of 67F2 and a native (calibrated) BER of 0.021% ( © 2024 IEEE.

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Reliable ferroelectricity down to cryogenic temperature in wakeup free Hf_(0.5)Zr_(0.5)O_(2)thin films by thermal atomic layer deposition

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Journal of Semiconductors 2024年第3期45卷 33-37页

作者： Shuyu Wu Rongrong Cao Hao Jiang Yu Li Xumeng Zhang Yang Yang Yan Wang Yingfen Wei Qi Liu State Key Laboratory of Fabrication Technologies for Integrated Circuits Institute of MicroelectronicsChinese Academy of SciencesBeijing 100029China Frontier institute of Chip and System Fudan UniversityShanghai 200433China College of Electronic Science and Technology National University of Defense TechnologyChangsha 410073China University of Chinese Academy of Sciences Beijing 100049China

The performance and reliability of ferroelectric thin films at temperatures around a few Kelvin are critical for their application in *** this work,TiN/Hf_(0.5)Zr_(0.5)O_(2)/TiN capacitors that are free from the wake-up effect are investigated systematically from room temperature(300 K)to cryogenic temperature(30 K).We observe a consistent decrease in permittivity(εr)and a progressive increase in coercive electric field(Ec)as temperatures *** investigation reveals exceptional stability in the double remnant polarization(2P_(r))of our ferroelectric thin films across a wide temperature ***,at 30 K,a 2P_(r)of 36μC/cm^(2)under an applied electric field of 3.0 MV/cm is ***,we observed a reduced fatigue effect at 30 K in comparison to 300 *** stable ferroelectric properties and endurance characteristics demonstrate the feasibility of utilizing HfO_(2)based ferroelectric thin films for cryo-electronics applications.

关键词： hafnia-zirconia solid solution ferroelectricity cryogenic temperature wake-up effect

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Signal Integrity Simulation and Analysis for 2.5D Advanced Package Interconnect Based on Universal Chiplet Interconnect Express (UCIe) 26

Signal Integrity Simulation and Analysis for 2.5D Advanced P...

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26th Electronics Packaging Technology Conference, EPTC 2024

作者： Fan, Yuxuan Gan, Hanchen Zhou, Yunyan Lei, Bo Song, Gang Wang, Qidong System Packaging and Integration Research Center Institute of Microelectronics of Chinese Academy of Sciences Beijing100029 China School of Integrated Circuits University of Chinese Academy of Sciences Beijing100049 China

ISBN: (纸本)9798331522001

This paper presents the design and signal integrity (SI) simulation of 2.5D advanced packaging interconnects based on the Universal Chiplet Interconnect Express (UCIe) protocol. The study compares multiple interconnect structures, including silicon bridge, wafer-level fan-out packages (WLFOP), and FCBGA substrate interconnect. Using UCIe-defined voltage transfer function (VTF) metrics for loss and crosstalk, the design achieves high-speed 32Gbps transmission with optimized routing patterns and transmission lines. This study offers a new approach for optimizing interconnect designs to meet UCIe standards, balancing signal integrity performance with the constraints of current manufacturing processes. The results provide insights into enhancing performance and scalability in chiplet-based heterogeneous integration systems. © 2024 IEEE.

关键词： Silicon wafers

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Optimized Valley Skipping Strategy to Improve Efficiency and Reduce THD for DCM Boost PFC Converter 4

Optimized Valley Skipping Strategy to Improve Efficiency and...

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4th International Conference on Power Engineering, ICPE 2023

作者： Wang, Wanyang Zhu, Living Zhang, Weniia Huang, Baoqiang Min, Run Tong, Qiaoling Zhang, Shuo Wang, Yinyu School of Integrated Circuits Huazhong University of Science and Technology Wuhan China Beijing Institute of Spacecraft System Engineering China Academy of Space Technology Beijing China

ISBN: (纸本)9798350340020

This article proposes an optimized valley skipping strategy to improve efficiency and reduce total harmonic distortion (THD) for boost power factor correction (PFC) converters in discontinuous conduction mode (DCM). In DCM, the valley skipping strategy is used to reduce the switching ON loss of the power switch. However, conventional skipping strategy causes dynamic changing valleys in a half-line cycle, leading to frequency hopping and extra current distortion. To avoid this, a control strategy based on constant skipping valleys (CSV) is proposed. Firstly, the switching frequency variation with CSV is derived based on the analytical expression of parasitic resonance. Secondly, by employing CSV in control, not only is the switching frequency hopping eliminated, but also the switching cycle corresponds more accurately with the desired cycle. Therefore, an accurate average current control is derived to reduce the current distortion. Thirdly, the CSV is tuned according to a loss estimation, which further improves the efficiency under valley skipping operation. Finally, a 250W prototype is built to verify the proposed control strategy. Experimental results demonstrate that the proposed strategy improves the efficiency by an average level of 0.4% and reduces the input current THD to levels below 3.1% at rated power. © 2023 IEEE.

关键词： Efficiency

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Low-Complexity and Multiplier-Free Baud-Rate Timing Phase Error Detector for High-Speed Optical IM/DD systems

Low-Complexity and Multiplier-Free Baud-Rate Timing Phase Er...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Jianwei Tang Bang Yang Jinlong Wei Chen Cheng Yaguang Hao Qi Wu Jianyu Wang Junpeng Liang Zhaopeng Xu Zhongliang Sun Yanfu Yang Weisheng Hu Department of Circuits and System Peng Cheng Laboratory Shenzhen China School of Integrated Circuits Harbin Institute of Technology Shenzhen China

ISBN: (数字)9798350372076

ISBN: (纸本)9798350372083

关键词： Detectors Optical detectors Adaptive optics Timing Electro-optical waveguides High-speed optical techniques

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