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2013 11th IEEE East-West Design and Test Symposium, EWDTS 2013

作者： Melikyan, Vazgen Sh. Sahakyan, Arthur S. Safaryan, Karo H. Dingchyan, Hayk H. Synopsys Armenia CJSC Armenia Department of Microelectronics Circuits and Systems State Engineering University of Armenia VLSI Design Specialization Synopsys Armenia Educational Department Armenia

ISBN: (纸本)9781479920969

A method of high accuracy equalization for linear equalizer in the receiver of a high-speed serial link presented in this paper. To validate the proposed method, we conducted experiments, for examples, with various injected faults, for which the conventional approach of examining the eye opening at the output of the equalizer results. The presented equalization mechanism can be used in the special input/output circuits of Universal Serial Bus (USB). © 2013 IEEE.

关键词： Equalizers

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Modeling and Measurement of 3D Solenoid Inductor Based on Through-Silicon Vias

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Chinese Journal of Electronics 2023年第2期32卷 365-374页

作者： YIN Xiangkun WANG Fengjuan ZHU Zhangming Vasilis F.Pavlidis LIU Xiaoxian LU Qijun LIU Yang YANG Yintang Shaanxi Key Lab.of Integrated Circuits and Systems School of Microelectronics Xidian University School of Automation and Information Engineering Xi'an University of Technique Department of Computer Science University of Manchester

Through-silicon via(TSV) provides vertical interconnectivity among the stacked dies in three-dimensional integrated circuits(3D ICs) and is a promising option to minimize 3D solenoid inductors for on-chip radio-frequency applications. In this paper, a rigorous analytical inductance model of 3D solenoid inductor is proposed based on the concept of loop and partial inductance. And a series of 3D samples are fabricated on 12-in high-resistivity silicon wafer using low-cost standard CMOS-compatible process. The results of the proposed model match very well with those obtained by simulation and measurement. With this model, the inductance can be estimated accurately and efficiently over a wide range of inductor windings, TSV height, space, and pitch.

关键词： Semiconductor device modeling Inductance Analytical models Solid modeling Three-dimensional displays Integrated circuit modeling Inductors

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CMN: a co-designed neural architecture search for efficient computing-in-memory-based mixture-of-experts

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Science China(Information Sciences) 2024年第10期67卷 100-114页

作者： Shihao HAN Sishuo LIU Shucheng DU Mingzi LI Zijian YE Xiaoxin XU Yi LI Zhongrui WANG Dashan SHANG Department of Electrical and Electronic Engineering The University of Hong Kong ACCESS-AI Chip Center for Emerging Smart Systems InnoHK Centers Key Lab of Fabrication Technologies for Integrated Circuits Chinese Academy of Sciences Laboratory of Microelectronics Devices and Integrated Technology Institute of MicroelectronicsChinese Academy of Sciences University of Chinese Academy of Sciences School of Microelectronics Southern University of Science and Technology

Artificial intelligence(AI) has experienced substantial advancements recently, notably with the advent of large-scale language models(LLMs) employing mixture-of-experts(MoE) techniques, exhibiting human-like cognitive skills. As a promising hardware solution for edge MoE implementations, the computing-in-memory(CIM) architecture collocates memory and computing within a single device, significantly reducing the data movement and the associated energy consumption. However, due to diverse edge application scenarios and constraints, determining the optimal network structures for MoE, such as the expert's location,quantity, and dimension on CIM systems remains elusive. To this end, we introduce a software-hardware co-designed neural architecture search(NAS) framework, CIM-based MoE NAS(CMN), focusing on identifying a high-performing MoE structure under specific hardware constraints. The results of the NYUD-v2 dataset segmentation on the RRAM(SRAM) CIM system reveal that CMN can discover optimized MoE configurations under energy, latency, and performance constraints, achieving 29.67×(43.10×) energy savings,175.44×(109.89×) speedup, and 12.24× smaller model size compared to the baseline MoE-enabled Visual Transformer, respectively. This co-design opens up an avenue toward high-performance MoE deployments in edge CIM systems.

关键词： mixture-of-experts computing-in-memory neural architecture search resistive random-access memory static random-access memory

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A Q-band CMOS LNA exploiting transformer feedback and noise-cancelling

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Science China(Information Sciences) 2015年第4期58卷 148-157页

作者： WU Jing JIANG ZhengDong YI Kai KANG Kai YU YiMing CHEN JiXin ZHANG Lei LIU Jun LI Le-Wei Joshua School of Economic Information Engineering Southwestern University of Finance and Economics School of Electronic Engineering University of Electronic Science and Technology of China State Key Laboratory of Millimeter Waves Southeast University Institute of Microelectronics Tsinghua University Key Laboratory of RF Circuits and Systems Hangzhou Dianzi University School of Engineering Monash University

In this paper, a Q-band CMOS low noise amplifier(LNA) exploiting transformer positive-negative feedback and noise cancelling is presented. The proposed low noise amplifier consists of a positive transformer feedback to achieve noise-reduction and a negative transformer feedback to obtain high reverse isolation and stability. The noise cancellation technique is applied in this LNA to achieve a low noise figure. This LNA has been fabricated by standard commercial 90 nm CMOS. According to measurements, this proposed LNA achieves a peak gain of 11.5 d B, a noise figure of 6.5 d B and an input P1 d B of-12 d Bm. It consumes 11.5 m A from a1.2 V supply occupying the area of 0.6×0.7 mm2.

关键词： CMOS low noise amplifier Q-band transformer feedback noise cancelling millimeter wave

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Full 2π phase modulation using exciton-polaritons in a two-dimensional superlattice

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Device 2025年第1期3卷

作者： Lynch, Jason Kumar, Pawan Chen, Chen Trainor, Nicholas Kumari, Shalina Peng, Tzu-Yu Chen, Cindy Yueli Lu, Yu-Jung Redwing, Joan Jariwala, Deep Electrical and Systems Engineering University of Pennsylvania Philadelphia 19104 PA United States Inter-University Microelectronics Center Leuven 3001 Belgium 2D Crystal Consortium Materials Innovation Platform Materials Research Institute Penn State University University Park PA United States Materials Science and Engineering Penn State University University Park PA United States Research Center for Applied Sciences Academia Sinica Taipei 11529 Taiwan Graduate Institute of Applied Physics National Taiwan University Taipei 10617 Taiwan Department of Chemistry University of Pennsylvania Philadelphia 19104 PA United States

Active metamaterials promise to enable active control over the propagation of wavefronts of light for applications such as beam steering, optical communication modulators, and holograms. Current commercial devices use active layers that are several wavelengths thick to modulate the phase of light, which limits their compactness and energy efficiency. In atomically thin optics, the phase has been modulated using a resonant mode such as a plasmon or high-Q cavity mode that enable light to accumulate a large amount of phase over a short distance and coupling it to an active material. Here, we report that electrostatic doping can modulate the light-matter interaction strength of a two-dimensional WS2-based multi-quantum-well (MQW) structure going from strongly coupled, phase-accumulating exciton-polaritons to weakly coupled exciton-trion-polaritons. This transition leads to 2.02π radians of phase modulation being observed. This result demonstrates the potential of the MQW structure as a compact, lightweight electro-optical modulators for light detection and ranging (LiDAR) and optical communications in the visible range. © 2024 The Author(s)

关键词： DTI-2: Explore electrostatic exciton-polaritons phase modulation superlattice transition-metal dichalcogenides

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Near-channel classifier: symbiotic communication and classification in high-dimensional space

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Brain Informatics 2021年第1期8卷 16页

作者： Hersche, Michael Lippuner, Stefan Korb, Matthias Benini, Luca Rahimi, Abbas Integrated Systems Laboratory ETH Zurich Zurich Switzerland IBM Research-Zurich Zurich Switzerland Institute of Microelectronics and Integrated Circuits Bundeswehr University Munich Germany Department of Electrical Electronic and Information Engineering University of Bologna Bologna Italy

Brain-inspired high-dimensional (HD) computing represents and manipulates data using very long, random vectors with dimensionality in the thousands. This representation provides great robustness for various classification tasks where classifiers operate at low signal-to-noise ratio (SNR) conditions. Similarly, hyperdimensional modulation (HDM) leverages the robustness of complex-valued HD representations to reliably transmit information over a wireless channel, achieving a similar SNR gain compared to state-of-the-art codes. Here, we first propose methods to improve HDM in two ways: (1) reducing the complexity of encoding and decoding operations by generating, manipulating, and transmitting bipolar or integer vectors instead of complex vectors;(2) increasing the SNR gain by 0.2 dB using a new soft-feedback decoder;it can also increase the additive superposition capacity of HD vectors up to 1.7× in noise-free cases. Secondly, we propose to combine encoding/decoding aspects of communication with classification into a single framework by relying on multifaceted HD representations. This leads to a near-channel classification (NCC) approach that avoids transformations between different representations and the overhead of multiple layers of encoding/decoding, hence reducing latency and complexity of a wireless smart distributed system while providing robustness against noise and interference from other nodes. We provide a use-case for wearable hand gesture recognition with 5 classes from 64 EMG sensors, where the encoded vectors are transmitted to a remote node for either performing NCC, or reconstruction of the encoded data. In NCC mode, the original classification accuracy of 94% is maintained, even in the channel at SNR of 0 dB, by transmitting 10,000-bit vectors. We remove the redundancy by reducing the vector dimensionality to 2048-bit that still exhibits a graceful degradation: less than 6% accuracy loss is occurred in the channel at − 5 dB, and with the interferenc

关键词： Vectors

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Multi-rate Clock-Data recovery solution in high speed serial links

Multi-rate Clock-Data recovery solution in high speed serial...

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IEEE International Conference on Electronics and Nanotechnology (ELNANO)

作者： Melikyan Vazgen Sahakyan Arthur Shishmanyan Aram Hekimyan Arsen Department of Microelectronics Circuits and Systems State Engineering University of Armenia Yerevan Armenia

Clock-Data recovery (CDR) architecture with multirate option in receiver of a high-speed serial link presented. Proper clock phase choosing and let it track data phase shifts over time are the main difficulties of all kind of CDR structures. This system helps to shift reference clock according to data signal phase to sample it in the most secure way regarding data errors and information loses. Meanwhile, since data signal can change phase over time due to noises and other uncertainties (jitter in the input point of receiver), CDR system should have some tracking option which could track data phase shifts over time and accordingly change phase of reference clock which coming from PLL.

关键词： Clocks Jitter Receivers Mixers Bit error rate Universal Serial Bus Simulation

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Simulating the obstacle avoidance behavior day and night based on the visible-infrared MoS_(2)/Ge heterojunction field-effect phototransistor

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Nano Research 2023年第8期16卷 11296-11302页

作者： Zhao Han Bo Wang Jie You Qiancui Zhang Yichi Zhang Tian Miao Ningning Zhang Dongdong Lin Zuimin Jiang Renxu Jia Jincheng Zhang Hui Guo Huiyong Hu Liming Wang Key Laboratory of Analog Integrated Circuits and Systems Ministry of EducationSchool of MicroelectronicsXidian UniversityXi’an 710071China Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences Department of Microelectronic Science and EngineeringNingbo UniversityNingbo 315211China Department of Physics Fudan UniversityShanghai 200433China

The contradiction between the high number of visually handicapped people and the scarcity of guide dogs has stimulated the demand for electronic guide dogs(EGDs).Here,we demonstrate an EGD by leveraging piezoresistors on a MoS_(2)/Ge heterostructure for simultaneous pressure-sensing and optical-sensing *** device has excellent gating capability and exhibits large positive and negative photoresponses under visible(532 nm,182 A/W)and infrared(1550 nm,37 A/W)*** characteristics allow the device to efficiently classify different obstacles at all times of day using pressure and light *** device reaches nearly 100%accuracy after 48 training sessions when used to classify frequent *** device adopts passive and active detection modes during the day and night,respectively,which improves the battery life of the *** work provides a significant reference for the future design of EGDs,which may help a greater number of visually impaired people by reducing the cost of such devices.

关键词： electronic guide dogs dual-band photodetection pressure and light synergy work round the clock

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Resistance calibration method without external precision elements

Resistance calibration method without external precision ele...

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East-West Design & Test Symposium (EWDTS)

作者： Vazgen Melikyan Arthur Sahakyan Mikayel Piloyan Gagik Hovhannisyan Aram Shishmanyan Taron Hovhannisyan Davit Trdatyan Department of Microelectronics Circuits and Systems State Engineering University of Armenia Yerevan Armenia

A method of resistance calibration without external precision elements usage presented in paper. In the proposed method, used structures which operation based on technologically accurate elements and signals to have high accuracy resistance after calibration. Architecture produces a calibration code corresponding to 50Ohms PVT compensated termination impedance, which is needed to avoid reflections in transmission lines. Standard calibration methods using external ~1% accuracy precision discreet resistance (50 or 200Ohms). The presented calibration mechanism using internal elements and can provide ~ 4-7% accuracy of calibration. Method can be used in the special input/output circuits of several standards such as Peripheral Component Interconnect (PCI), Universal Serial Bus (USB), Double Data Rate (DDR) etc.

关键词： Calibration Resistance Accuracy Capacitors Resistors Receivers Reflection

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Design of high-efficiency digital-control multi-topology step-down switched capacitor converter

Design of high-efficiency digital-control multi-topology ste...

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IEEE International Conference on Electronics and Nanotechnology (ELNANO)

作者： Sh. Melikyan Vazgen A. Galstyan Vache Department of Microelectronics Circuits and Systems State Engineering University of Armenia Yerevan Armenia

This paper presents a multi-topology step-down switched-capacitor (SC) converter with a novel digital control. The feedback control system performs digital control over operating frequency and topology of the converter to efficiently modify the SC configuration depending on actual current load as well as required output voltage. The feedback is designed without the usage of reference voltages which provides easy integration of proposed SC converter in digital systems. The converter achieves maximal efficiency of 88%, while providing a wide range of load current and low level of output voltage ripple. Due to the multi-topology structure, high efficiency is provided over 1.3V of input voltage. The converter is designed in 28nm CMOS process using the proposed technique.

关键词： Clocks Topology Switches Frequency conversion Switching circuits Voltage control

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