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XOR spin logic operated by unipolar current based on field-free spin-orbit torque switching induced by a lateral interface

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Rare Metals 2024年第8期43卷 3868-3875页

作者： Yan-Ru Li Mei-Yin Yang Guo-Qiang Yu Bao-Shan Cui Jin-Biao Liu Yong-Liang Li Qi-Ming Shao Jun Luo Key Laboratory of Microelectronic Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences(IMECAS)Beijing 100029China University of Chinese Academy of Sciences(UCAS) Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China Key Laboratory for Magnetism and Magnetic Materials of Ministry of Education Lanzhou UniversityLanzhou 730000China Department of Electronic and Computer Engineering The Hong Kong University of Science and TechnologyHong Kong 999077China

Spin logics have emerged as a promising avenue for the development of logic-in-memory *** particular,the realization of XOR spin logic gates using a single spin-orbit torque device shows great potential for low-power stateful logic circuits in the next *** this study,we successfully obtained the XOR logic gate by utilizing a spin-orbit torque device with a lateral interface,which was created by local ion implantation in the Ta/Pt/Co/Ta Hall device exhibiting perpendicular magnetic *** angle of the lateral interface is set at 45°relative to the current direction,leading to the competition between symmetry breaking and current-driven Néel-type domain wall ***,the field-free magnetic switching reversed is realized by the same sign of current amplitude at this *** on this field-free magnetic switching behavior,we successfully proposed an XOR logic gate that could be implemented using only a single spin-orbit torque Hall *** study provides a potentially viable approach toward efficient spin logics and in-memory computing architectures.

关键词： Filed-free magnetic switching Spin-orbit torque XOR logic gate Lateral interface

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A CMOS LNA with Improved Multi-Path Noise-Canceling for K-Band Communications

A CMOS LNA with Improved Multi-Path Noise-Canceling for K-Ba...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Chenge Hu Ziyao Wang Chunqi Shi Leilei Huang Jinghong Chen Runxi Zhang Institute of Microelectronic Circuits and Systems East China Normal University Shanghai China Department of Electrical and Computer Engineering University of Houston Houston TX USA

ISBN: (数字)9798331509606

ISBN: (纸本)9798331509613

This paper presents a transformer-based improved multi-path noise-canceling (IMNC) low noise amplifier (LNA) for K-band satellite communications. The design enhances the dual-path noise cancellation and significantly reduces the noise figure. The proposed LNA employs a three-coil transformer with dual-eight-shaped inductor to boost gain, and introduces a noise cancellation path for the common-gate transistor to optimizes noise performance. During the circuit design phase, a multicomponent integrated modeling (MIM) technique is applied, which accurately characterizes the EM field of the LNA and ensures high consistency between simulation and measurement results. The LNA, fabricated in a 40 nm CMOS process, consumes 28.8 mW of power and achieves a peak gain of 12.6 dB. Its 3-dB bandwidth ranges from 19.9 to 25 GHz with a minimum noise figure of 2 dB. The core area of the LNA is $0.16 ~\text{mm}^{2}$ .

关键词： Microwave measurement Wireless communication Noise figure K-band Noise cancellation Transformers Transistors Inductors Gain Satellite communications

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A Systematic Design Method Based on Vector Analysis for mmW DCML Divider

A Systematic Design Method Based on Vector Analysis for mmW ...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Wangming Liu Wenbo Guo Chunqi Shi Jinghong Chen Runxi Zhang Institute of Microelectronic Circuits and Systems East China Normal University Shanghai China Department of Electrical and Computer Engineering University of Houston Houston TX USA

ISBN: (数字)9798331509606

ISBN: (纸本)9798331509613

The traditional RC delay model and the small-signal model do not suffice for a precise analysis of the dynamic current mode logic (DCML) divider in the millimeter-wave (mmW) frequency band. This paper explores the current vector model and examines the prerequisites for the proper functioning of the DCML, including phase, gain, and amplitude aspects, using expressions and vector diagrams as references. To fulfill the frequency division requirements of mmW ultra-wideband phaselocked loops, a broadband DCML4 divider has been designed based on the aforementioned analysis. Simulation results show that with an input power of -4 dBm, the maximum frequency division range for a single sub-band can reach up to 137.5% (from 5 to 27 GHz). The center frequency is adjusted via biasing, enabling the total frequency coverage to achieve 150% (ranging from 5 to 35 GHz). At a supply voltage of 1.2 V, the average power consumption is only 6.72 mW.

关键词： Wireless communication Analytical models Power demand Systematics Simulation Millimeter wave technology Voltage Frequency conversion Vectors Ultra wideband technology

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A High-Linear PLL-based FMCW Frequency Synthesizer with 42-kHz rms FM Error and 1.2-GHz Chirp Bandwidth

A High-Linear PLL-based FMCW Frequency Synthesizer with 42-k...

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IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Zitong Zhang Yuri Lu Xiaoyuan Wu Hao Deng Chunqi Shi Leilei Huang Jinghong Chen Runxi Zhang Institute of Microelectronic Circuits and Systems East China Normal University Shanghai China Department of Electrical and Computer Engineering University of Houston Houston USA

This article presents a high-linear phase-locked-loop-based (PLL-based) frequency-modulated continuous-wave (FMCW) frequency synthesizer for 77 GHz automotive radar applications. A behavioral model of the rms FM error by constructing the PLL transient response under a unit frequency step and taking into account the slope of the chirp signal is developed. Simulation results demonstrate the effectiveness of the proposed model in optimizing chirp linearity. The behavioral model is used to facilitate the design of the 77 GHz FMCW synthesizer fabricated in a 55 nm CMOS process. A gain linearized varactor approach is also developed to linearize the voltage-controlled oscillator (VCO) gain (K VCO ) to ensure constant PLL bandwidth maintaining optimum chirp linearity. Measurement results show that the synthesizer achieves a 1.2 GHz chirp bandwidth, a minimum rms FM error of 42 kHz (0.0035% of the chirp bandwidth) under a 4.219 MHz/μs chirp slope while consuming 74.6 mW of power. The measured integer-N mode and fractional-N mode phase noises normalized to 78 GHz are −81.6 dBc/Hz and −80.1 dBc/Hz at 1 MHz offset, respectively.

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First Study of the Charge Trapping Aggravation Induced by Anti-Ferroelectric Switching in the MFIS Stack

First Study of the Charge Trapping Aggravation Induced by An...

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Symposium on VLSI Technology

作者： Zuopu Zhou Leming Jiao Zijie Zheng Xiaolin Wang Dong Zhang Kai Ni Xiao Gong Department of Electrical and Computer Engineering National University of Singapore (NUS) Singapore Department of Electrical and Microelectronic Engineering Rochester Institute of Technology Rochester NY USA

In this work, we perform systematic and deep understanding of the interplay between polarization switching and charge trapping (CT) for both ferroelectric (FE) metal-ferroelectric-insulator-semiconductor (MFIS) stack and anti-ferroelectric (AFE) MFIS stack. Assisted by the simulation with a unified FE/AFE model and CT model, the different roles of FE and AFE switching in the CT process are unraveled, high-lighting the aggravated CT effect induced by the AFE. We further build a comprehensive FeFET model considering (a) phase fluctuation among FE/AFE/dielectric (DE) phases, (b) E C variation, (c) un-uniform CT process, and (d) channel percolation, which predicts a more severe memory window (MW) degradation caused by the AFE phase compared with DE phase. The results emphasize the necessity of suppressing the AFE phase for the optimization of FeFETs.

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Temperature Dependent Implantation of As-Isoelectronic Impurity in GaN Micro and Nanostructures

Temperature Dependent Implantation of As-Isoelectronic Impur...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Aadil Waseem Clarence Chan Xihang Wu Yujie Liu Yifan Shen Manos Kapritsos Theodore B Norris Xiuling Li Chandara Family Department of Electrical and Computer Engineering Microelectronic Research Center The University of Texas at Austin Austin Tx USA Department of Electrical and Computer Engineering Holonyak Micro and Nanotechnology Laboratory University of Illinois Urbana-Champaign Urbana Illinois USA Department of Electrical Engineering and Computer Science University of Michigan Ann Arbor Michigan USA

To enhance solar photo absorption of III-N semiconductors, we demonstrate Arsenic implantation at elevated temperatures, improving doping activation and reducing crystal damage.

ISBN: (纸本)9798350369311

To enhance solar photo absorption of III-N semiconductors, we demonstrate Arsenic implantation at elevated temperatures, improving doping activation and reducing crystal damage.

关键词： Temperature dependence Photonic band gap Impurities Arsenic Metals Lattices Crystals Electro-optic effects Doping profiles Nanostructures

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Model-based Deep Learning for Wireless Resource Allocation in RSMA Communications Systems

arXiv

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arXiv 2024年

作者： Zhang, Hanwen Chen, Mingzhe Vahid, Alireza Ye, Feng Sun, Haijian School of Electrical and Computer Engineering University of Georgia AthensGA United States Department of Electrical and Computer Engineering University of Miami Coral GablesFL United States Electrical and Microelectronic Engineering Rochester Institute of Technology RochesterNY United States Department of Electrical and Computer Engineering University of Wisconsin-Madison Wisconsin WI United States

Rate-splitting multiple access (RSMA) has been proven as an effective communication scheme for 5G and beyond. However, current approaches to RSMA resource management require complicated iterative algorithms, which cannot meet the stringent latency requirement by users with limited resources. Recently, data-driven methods are explored to alleviate this issue. However, they suffer from poor generalizability and scarce training data to achieve satisfactory performance. In this paper, we propose a fractional programming (FP) based deep unfolding (DU) approach to address resource allocation problem for a weighted sum rate optimization in RSMA. By carefully designing the penalty function, we couple the variable update with projected gradient descent algorithm (PGD). Following the structure of PGD, we embed a few learnable parameters in each layer of the DU network. Through extensive simulation, we have shown that the proposed model-based neural networks can yield similar results compared to the traditional optimization algorithm for RSMA resource management but with much lower computational complexity, less training data, and higher resilience to out-of-distribution (OOD) data. © 2024, CC BY.

关键词： 5G mobile communication systems

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Model-based Deep Learning for QoS-Aware Rate-Splitting Multiple Access Wireless Systems

arXiv

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arXiv 2024年

Next generation communications demand for better spectrum management, lower latency, and guaranteed quality-of-service (QoS). Recently, Artificial intelligence (AI) has been widely introduced to advance these aspects in next generation wireless systems. However, such AI applications suffer from limited training data, low robustness, and poor generalization capabilities. To address these issues, a model-driven deep unfolding (DU) algorithm is introduced in this paper to bridge the gap between traditional model-driven communication algorithms and data-driven deep learning. Focusing on the QoS-aware rate-splitting multiple access (RSMA) resource allocation problem in multi-user communications, a conventional fractional programming (FP) algorithm is first applied as a benchmark. The solution is then refined by the application of projection gradient descent (PGD). DU is employed to further speed up convergence procedure, hence improving the efficiency of PGD. Moreover, the feasibility of results is guaranteed by designing a low-complexity projection based on scale factors, plus adding violation control mechanisms into the loss function that minimizes error rates. Finally, we provide a detailed analysis of the computational complexity and analysis design of the proposed DU algorithm. Extensive simulations are conducted and the results demonstrate that the proposed DU algorithm can reach the optimal communication efficiency with a mere 0.024% violation rate for 4 layers DU. The DU algorithm also exhibits robustness in out-of-distribution tests and can be effectively trained with as few as 50 samples. © 2024, CC BY.

关键词： Quality of service

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Synthesis Design of Low-Loss and Self-Packaged Bandpass Filter on λ/4 SISL Resonators Using the Short-Open-Load (SOL) Technique

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IEEE Transactions on Components, Packaging and Manufacturing Technology 2025年

作者： Li, Shuangxu Zhu, Lei Ma, Kaixue Tianjin University School of Microelectronics Tianjin300072 China University of Macau Faculty of Science and Technology Department of Electrical and Computer Engineering Macau China Tianjin Key Laboratory of Imaging and Sensing Microelectronic Technology Tianjin300072 China

In this article, an efficient and accurate synthesis design method for bandpass filters (BPFs) based on low-loss quarter-wavelength (λ/4) substrate integrated suspended line (SISL) resonators is proposed, using the short-open-load (SOL) calibration technique. The BPF topology is comprised of SISL with two volumes of vias on both side walls and alternating SISL-based J/K inverters. First, with the help of full-wave simulation, the propagation characteristics of the SISL with periodically loaded pins are analyzed and extracted by SOL. Afterward, to facilitate the filter synthesis design, the equivalent circuit parameters of each J/K inverter with symmetrical/asymmetrical feed lines are accurately extracted. Herein, the extra transition for circuit measurement can be directly merged into the input port of the J01 inverter, and then be regarded as an error box to be calibrated out by SOL. Therefore, the efficient co-design of the resultant SISL BPF containing the feed transition can be achieved. Finally, two 4th-order all-pole Chebyshev SISL BPFs with λ/4 resonators are designed and fabricated. The synthesized, simulated, and measured results of all the implemented SISL BPFs are found in good agreement, evidently demonstrating the effectiveness of the SOL technique for designing the SISL circuits. In addition, the SISL BPFs have the advantages of low loss and self-packaging against traditional planar BPFs. © 2025 IEEE.

关键词： Bandpass filters

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Deep Convolutional Feature-based Gait Recognition Using Silhouettes and RGB Images 6

Deep Convolutional Feature-based Gait Recognition Using Silh...

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6th International Conference on computer Science and engineering, UBMK 2021

作者： Içik, Selin Gök Ekenel, Hazim Kemal Microelectronic Guidance and Electro-Optical Group Aselsan Ankara Turkey Department of Computer Engineering Istanbul Technical University Istanbul Turkey

ISBN: (纸本)9781665429085

Today, many different biometrie features are used for human identification. Unlike biometrie features, such as eye, iris, ear, and fingerprint, gait biometrics enables recognition from long distance and low resolution images. In this paper, different design choices for a deep learning-based gait recognition system are investigated in detail. Some preprocessing steps, such as human silhouette extraction and gait cycle calculation are eliminated to make the system suitable for practical applications. To assess different input types' effect on the gait recognition performance, both binary silhouettes and RGB images are given as input to the network. To observe the contribution of transfer learning, we fine-tuned a pre-trained generic object recognition model with the CASIA-B gait dataset and performed experiments on the OU-ISIR Large Population gait dataset. To observe the effect of pose variations, we conducted experiments for both identical-view and cross-view conditions. Successful results are obtained, especially for cross-view gait recognition, compared to different approaches for gait recognition. © 2021 IEEE

关键词： Gait analysis

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