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Optimization design of autofocusing metasurface for ultrasound wave application

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Journal of Advanced Dielectrics 2024年第1期14卷 51-58页

作者： Zhaoxi Li Shenghui yang Mengqing Zhou Chenxue Hou Dongdong Chen Chunlong Fei Di Li Yi Quan yintang yang School of Microelectronics Xidian UniversityXi’anShaanxi 710071P.R.China

In this paper,two optimized autofocusing metasurfaces(AFMs)with different desired focal distances are designed by using particle swarm optimization(PSO)*** on the ffnite element simulation software COMSOL Multiphysics,the performance of ultrasound transducer(UT)with AFM at different design parameters in Airy distributions(r0,ω)and the bottom thickness(d)of AFM are simulated and *** on the simulation data,the artiffcial neural network model is trained to describe the complex relationship between the design parameters of AFM and the performance parameters of ***,the multiobjective optimization function for AFM is determined according to the desired performance parameters of UT,including focal position,lateral resolution,longitudinal resolution and absolute sound *** order to obtain AFMs with the desired performance,PSO algorithm is adopted to optimize the design parameters of AFM according to the multiobjective optimization function,and two AFMs are optimized and *** experimental results well agree with the simulation and optimization results,and the optimized AFMs can achieve the desired *** fabricated AFM can be easily integrated with UT,which has great potential applications in wave ffeld modulation underwater,acoustic tweezers,biomedical imaging,industrial nondestructive testing and neural regulation.

关键词： Autofocusing metasurface ultrasound transducer optimization

Effect and mechanism of on-chip electrostatic discharge protection circuit under fast rising time electromagnetic pulse

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强激光与粒子束 2024年第10期36卷 44-52页

作者： Mao Xinyi Chai Changchun Li Fuxing Lin Haodong Zhao Tianlong yang yintang Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices Xidian UniversityXi’an 710071China

The electrostatic discharge(ESD)protection circuit widely exists in the input and output ports of CMOS digital circuits,and fast rising time electromagnetic pulse(FREMP)coupled into the device not only interacts with the CMOS circuit,but also acts on the protection *** paper establishes a model of on-chip CMOS electrostatic discharge protection circuit and selects square pulse as the FREMP *** on multiple physical parameter models,it depicts the distribution of the lattice temperature,current density,and electric field intensity inside the *** the same time,this paper explores the changes of the internal devices in the circuit under the injection of fast rising time electromagnetic pulse and describes the relationship between the damage amplitude threshold and the pulse *** results show that the ESD protection circuit has potential damage risk,and the injection of FREMP leads to irreversible heat loss inside the *** addition,pulse signals with different attributes will change the damage threshold of the *** results provide an important reference for further evaluation of the influence of electromagnetic environment on the chip,which is helpful to carry out the reliability enhancement research of ESD protection circuit.

关键词： fast rising time electromagnetic pulse damage effect electrostatic discharge protection circuit damage location prediction

Coverage of communication-based sensor nodes deployed location and energy efficient clustering algorithm in WSN

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Journal of Systems Engineering and Electronics 2010年第4期21卷 698-704页

作者： Xiang Gao yintang yang Duan Zhou College of Microelectronics Xidian University Xi' an 710071 P. R. China College of Computer Science and Technology Xidian University Xi'an 710071 E R. China

An effective algorithm based on signal coverage of effective communication and local energy-consumption saving strategy is proposed for the application in wireless sensor *** algorithm consists of two *** is the multi-hop partition subspaces clustering algorithm for ensuring local energybalanced consumption ascribed to the deployment from another algorithm of distributed locating deployment based on efficient communication coverage probability（DLD-ECCP）.DLD-ECCP makes use of the characteristics of Markov chain and probabilistic optimization to obtain the optimum topology and number of sensor *** simulation,the relative data demonstrate the advantages of the proposed approaches on saving hardware resources and energy consumption of networks.

关键词： wireless sensor network probability distribution function Markov chain received signal strength indicator Gaussian distribution.

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An intelligent partitioning approach of the system-on-chip for flexible and stretchable systems

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Science China(Information Sciences) 2018年第6期61卷 67-77页

作者： Changqing XU Yi LIU yintang yang School of Microelectronics Xidian University

In this paper, we propose an intelligent partitioning approach of the system-on-chip(So C) to improve the bendability and stretchability of flexible and stretchable systems. The proposed approach partitions the So C intelligently into clusters of functional modules according to the communication flows and area constraint. Based on the communication volume between clusters, a heuristic algorithm is applied to map these clusters onto the 2 D mesh network-on-chip(No C) for co-optimization of communication energy and delay. Experimental results show that our approach can effectively partition the So C into small ICs of the same size. The approach also reduces power consumption and communication delay by 10.64%–56.63%and 15.06%–50.30%, respectively.

关键词： functional module clustering cluster mapping SoC flexible and stretchable systems

A Fully-Integrated Low-Power Analog Front-End for ZigBee Transmitter Applications

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Chinese Journal of Electronics 2016年第3期25卷 424-431页

作者： SHI Zuochen yang yintang LI Di LIU yang School of Microelectronics Xidian University

A low-power high-linearity Analog frontend(AFE) composed by a Digital-to-analog converter(DAC) and a Low-pass filter(LPF) is proposed in this paper for Zig Bee transmitter applications. The DAC is realized by current-steering topology which adopts an optimized segmentation method to resolve the contradiction between requirements of linearity and power. A Successive approximation register(SAR) frequency auto-tuning operation is presented for the LPF to accommodate the performance deterioration due to the Process, voltage and temperature(PVT) variations. Implemented in a 0.13μm CMOS technology, the proposed AFE has been fully integrated in a ZigBee transceiver chip with an area of0.23mm2. The experimental results demonstrate that it achieves a linearity of 30 dB m Output 3rd order intercept point(OIP3) and dissipates 4.75 m A from a 1.2V supply.

关键词： Analog front-end ZigBee transmitter Segmented current-steering Auto-tuning

Modeling and understanding of the frequency dependent HPM upset susceptibility of the CMOS inverter

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Science China(Information Sciences) 2015年第8期58卷 182-192页

作者： YU XinHai CHAI ChangChun LIU yang yang yintang Key Laboratory of Ministry of Education for Wide Band-Gap Semiconductor Materials and Devices School of Microelectronics Xidian University

In this paper, we interpret and, for the first time, model a frequency dependent high-power microwave(HPM) upset susceptibility. We constructed the analytical models of the total amount of injected charges N inj, the excess carrier density distribution in P-Substrate, and the frequency dependent HPM upset susceptibility level. The models are validated by simulated results and experimental data, respectively. Results reveal that N inj is proportional to fαwhile the exponent α should be adjusted to-0.525. The excess carrier density distribution behaves the frequency dependence as well; the dependence is attributable to the fact that the AC field within the CMOS inverter varies too rapidly for the carriers to follow at high frequency. Meanwhile,the HPM upset susceptibility level is a decreasing function of f. The f dependent HPM upset susceptibility model is verified to be reliable and able to quickly estimate the susceptibility level of CMOS inverter considering IC technology, layout parameters, pulse properties, and operating environment simultaneously. Besides, the empirical formula P = A · fαis proposed to provide instant estimation to the HPM upset power threshold. In conclusion, by aid of the analytical model, we acquired the influence of the layout parameter LB on the HPM susceptibility and demonstrated that the CMOS inverter with minor LB is more susceptible to HPM.

关键词： high power microwave frequency upset CMOS analytical model

A stretchable flexible electronic platform for mechanical and electrical collaborative design

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Science China(Information Sciences) 2018年第6期61卷 95-109页

作者： Ziming DONG Baoxing DUAN Jiachen LI yintang yang School of Microelectronic Xidian University

With the extensive application of stretchable flexible electronic circuits to wearable equipment and biomedicine, research on the electrical properties of such circuits has become a hot topic. In this paper, a flexible electronic design platform is established for the first time, realizing co-simulation of the mechanical and electronic aspects. The main functions of this platform include the design of stretchable interconnects, flexible devices, stretchable flexible electronic circuits, and stretchable flexible circuit-layout wiring. The following conclusions can be obtained:(1) With increased applied strain, the inductance of a stretchable interconnect will increase, while the delay and crosstalk will become non-negligible.(2) Although the performance of flexible passive devices does not change after transfer printing, the gate capacitor of the flexible MOS at the cut-off area does decrease.(3) Taking a flexible comparator as an example, the function and electrical performance of a flexible circuit are verified.(4) Taking a flexible amplifier circuit as an example, the flexible interconnection layout and wiring are simulated and verified.

关键词： flexible electronic design platform stretchable interconnect flexible device stretchable flexible electronic circuit stretchable flexible circuit layout wiring

An Asynchronous Adaptive Priority Round-Robin Arbiter Based on Four-Phase Dual-rail Protocol

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Chinese Journal of Electronics 2015年第1期24卷 1-7页

作者： yang yintang WU Ruizhen ZHANG Li ZHOU Duan School of Microelectronics Xidian University School of Computer Science and Technology Xidian University

An asynchronous Adaptive priority roundrobin arbiter(APRA) based on four-phase dual-rail protocol is proposed. Combining the advantages of synchronous and asynchronous circuits, it provides the required bandwidth allocation on basis of arbitration fairness and works in synchronous So C. In the Nonidling and nonpreemptive(NINP) model, simulations and verifications are made. The results show that the speed of the proposed arbiter is improved by 18%–50.4% and the dynamic and static power is reduced by 8.4%–46.2% and 81.8%–90.9% respectively compared with the commonly-used Fixed priority(FP),Round-Robin(RR) and Lottery arbiters. The proposed arbiter is better in output bandwidth allocation and it also has advantages in speed and power. Furthermore, it is easy in reconfiguration, strong in practicability and low in complexity of system integration and suits various extreme communication traffics.

关键词： Arbiter Asynchronous circuit Fourphase dual-rail protocol System-on-chip(So C).

Privacy Protection Smartcard Authentication Scheme in Cloud Computing

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Chinese Journal of Electronics 2018年第1期27卷 41-45页

作者： FAN Kai DENG Hai LI Hui yang yintang State Key Laboratory of Integrated Service Networks Xidian University

Cloud computing provides users with a great deal of flexibility and convenience. However, cloud computing also brings very serious security problems, especially for enterprise data security stored in the *** the data is outsourced to a third party, the data privacy has become a ma jor problem, such as user authentication, integrity of data etc. and needs to be addressed very effectively. A mutual authentication scheme based on smartcard for cloud computing is proposed to solve the problem of which the illegal users access the resource of cloud servers and the legal users access the illegal cloud server. The scheme achieves mutual authentication by using hash functions to protect user privacy. Performance comparison shows that the proposed scheme is an efficient one.

关键词： Cloud computing Smartcard Mutual authentication Privacy protection