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Tianmouc vision chip designed for open-world sensing

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Science China Materials 2024年第9期67卷 3046-3048页

作者： Haotian Li Qilin Hua Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing100081China institute of Flexible electronics Beijing Institute of TechnologyBeijing102488China

Driven by the forward development of highly interactive applications like autonomous robots and artificial intelligence[1,2],image sensors are continuously demanded to improve in terms of high speed,high resolution,wide dynamic range,and high precision[3].However,due to inherent limitations in power and bandwidth,significant enhancements in one aspect often necessitates compromises in others[4].

关键词： artificial interactive autonomous

Wireless multisite sensing systems for continuous physiological monitoring

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Science China Materials 2024年第6期67卷 2045-2047页

作者： Ruilai Wei Qilin Hua Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing 100081China institute of Flexible electronics Beijing Institute of TechnologyBeijing 102488China

Respiratory diseases rank as the third leading cause of adult mortality[1],while cardiopulmonary and gastrointestinal issues are the primary cause of death within the first five years of a child’s life[2].The monitoring of cardiac,respiratory,and gastrointestinal sounds plays a vital role in routine care,as alterations or absence of these body sounds can serve as indicators of underlying diseases.

关键词： routine continuous monitoring

An adaptive 3D reconstruction method for asymmetric dual-angle multispectral stereo imaging system on UAV platform

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Science China(Information Sciences) 2024年第8期67卷 285-299页

作者： Chen WANG Xian LI Yanfeng GU Zixu WANG School of electronics and Information Engineering Harbin Institute of Technology Beijing institute of Control and Electronic Technology

A multispectral imaging system often cannot capture 3D spatial information owing to hardware limitations, which diminishes the effectiveness across various domains. To address this problem, we have developed a multispectral stereo imaging system along with an adaptive 3D reconstruction algorithm. Unlike existing unmanned aerial vehicle stereo imaging systems, our multispectral stereo imaging system uses two multispectral cameras with asymmetric spectral bands positioned at different angles. This design enables the acquisition of a higher number of bands and lateral spatial information while maintaining a lightweight structure. This system introduces challenges such as large geometric distortions and intensity differences between multiple bands. To accurately recover 3D spatial information, we propose an adaptive 3D reconstruction method. This method employs a position and orientation system-assisted projection transformation and a normalized threshold adjustment strategy. Finally, mutual information is used to reconstruct the multispectral images densely, effectively addressing nonlinear differences and generating a comprehensive multispectral point cloud. Our stereo system was used for two real data collections in different regions, and the efficacy of the proposed 3D reconstruction method was validated by comparing it with existing methods and commercial software.

关键词： multispectral images 3D reconstruction stereo imaging system unmanned aerial vehicle feature extraction

An ultra-deep TSV technique enabled by the dual catalysis-based electroless plating of combined barrier and seed layers

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Microsystems & Nanoengineering 2024年第3期10卷 409-419页

作者： Yuwen Su Yingtao Ding Lei Xiao Ziyue Zhang Yangyang Yan Zhifang Liu Zhiming Chen Huikai Xie School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijingChina Chongqing institute of Microelectronics and Microsystems Beijing Institute of TechnologyChongqingChina

Silicon interposers embedded with ultra-deep through-silicon vias(TSVs)are in great demand for the heterogeneous integration and packaging of opto-electronic chiplets and microelectromechanical systems(MEMS)*** the cost-effective and reliable manufacturing of ultra-deep TSVs,the formation of continuous barrier and seed layers remains a crucial challenge to ***,we present a novel dual catalysis-based electroless plating(ELP)technique by tailoring polyimide(PI)liner surfaces to fabricate dense combined Ni barrier/seed layers in ultradeep *** additional to the conventional acid catalysis procedure,a prior catalytic step in an alkaline environment is proposed to hydrolyze the PI surface into a polyamide acid(PAA)interfacial layer,resulting in additional catalysts and the formation of a dense Ni layer that can function as both a barrier layer and a seed layer,particularly at the bottom of the deep *** with depths larger than 500μm and no voids are successfully fabricated in this *** fabrication process involves low costs and *** a fabricated 530-μm-deep TSV with a diameter of 70μm,the measured depletion capacitance and leakage current are approximately 1.3 pF and 1.7 pA at 20 V,respectively,indicating good electrical *** proposed fabrication strategy can provide a cost-effective and feasible solution to the challenge of manufacturing ultra-deep TSVs for modern 3D heterogeneous integration and packaging applications.

关键词： properties catalysis alkaline

Flexible ultrasound arrays with embossed polymer structures for medical imaging

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Journal of Semiconductors 2024年第8期45卷 1-3页

作者： Zhongming Chen Qilin Hua Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing 100081China institute of Flexible electronics Beijing Institute of TechnologyBeijing 102488China

In recent years,the application of flexible electronic technology[1−3]combined with ultrasonic imaging[4]has blossomed,resulting in a shift in the application place of ultrasonic imaging technology from medical institutions to *** utilization of this application has expanded from the physician’s positioning and guidance to real-time patient monitoring[5],while the range of application scenarios continues to *** transformative changes have made possible through the development of flexible transducer arrays[6,7].*** Xu's team at the University of California San Diego has pioneered the development of various flexible transducer arrays based on island-bridge structures[8]and serpentine electrodes[9].These transducer arrays incorporate rigid 1−3 composite piezoelectric transducers on an island,featuring thin electrodes between the islands to provide mechanical flexibility,metallic electrodes of serpentine structure to provide stretchability of the device,and elastomer materials are used to encapsulate the overall structure,ensuring structural stability and impedance matching to the skin tissue[10].These flexible transducer arrays have found extensive applications in human blood pressure detection[11],cardiac imaging[12],blood flow doppler imaging[13],tissue modulus detection[14],and tissue deep hemoglobin detection[15].

关键词： island matching expanded

Artificial hawk-eye camera for foveated, tetrachromatic, and dynamic vision

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Journal of Semiconductors 2024年第9期45卷 1-3页

作者： Wenhao Ran Zhuoran Wang Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing 100081China institute of Flexible electronics Beijing Institute of TechnologyBeijing 102488China

With the rapid development of drones and autonomous vehicles, miniaturized and lightweight vision sensors that can track targets are of great interests. Limited by the flat structure, conventional image sensors apply a large number of lenses to achieve corresponding functions, increasing the overall volume and weight of the system.

关键词： awk vision system.

A Fast Startup Crystal Oscillator with Digital SAR-AFC Based Two-Step Injection

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Chinese Journal of electronics 2024年第5期33卷 1147-1153页

作者： Bo ZHOU Yifan LI Zuhang WANG School of Integrated Circuits and electronics Beijing Institute of Technology

Crystal oscillators（XOs） provide a high-precision reference frequency but have a long startup time,which severely increases the average power consumption in duty-cycled *** paper proposes a fully-digital low-cost two-step injection technique,by using a successive approximation register（SAR） based auto frequency control（AFC） loop,to speed up the startup behavior of XOs.A theoretical analysis is carried out to determine the optimum injection time and design low-power *** in a 65 nm CMOS process,the proposed 12 MHz fast startup XO occupies an active area of 0.02 mm2and achieves a startup time less than 35 μ*** XO power consumption in the steady state is 40 μW from a 1.0-V supply,with a startup energy of 17.2 nJ.

关键词： Time-frequency analysis Power demand Power measurement Crystals Time measurement Steady-state Registers Crystal oscillator Two-step injection Successive approximation register Auto frequency control Fully-digital Fast startup ENERGY

Chipless textile electronics: human body-coupled fiber for wireless energy harvesting and signal transmission

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Science China Materials 2024年第7期67卷 2367-2368页

作者： Yixuan Wang Zuqing Yuan Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing 100081China

Wearable technology is rapidly advancing through the integration of electronic devices and textiles,enabling intelligent interaction between clothing and the surrounding *** electronics are specifically designed to provide functions such as sensing,computation,display,and ***,traditional wearable devices that rely on rigid von Neumann architectures and incorporate silicon chips face challenges in seamless integration,energy efficiency,and comfort[1–3].Difficulties arise when attempting to integrate complex circuits and electronic components,which are traditionally relied upon for signal modulation,into soft fibers[4,5].Recent reports have begun to explore alternative architectures for wearable devices that can incorporate electronics into a single fiber[6].However,this process presents challenges in simultaneously controlling energy capture and release within a single fiber.

关键词： fiber signal energy

CMOS-level mega-pixel organic camera chips made of photocrosslinked photovoltaic nanocells

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Science China Materials 2024年第9期67卷 3043-3045页

作者： Yegang Liang Zhuoran Wang Guozhen Shen School of Integrated Circuits and electronics Beijing Institute of TechnologyBeijing100081China

Organic and hybrid optoelectronics have been driving the frontiers in displays,sensing,and energy in recent decades due to their superior performance,low-cost high-yield manufacturing,and new form factor of mechanical flexibility that is promising for lightweight and wearable applications[1-3].However,the inherent vulnerability makes organic semiconductors incompatible with conventional semiconductor microfabrication,posing significant challenges in high density integration to compete with the resolution of conventional image sensors[4].

关键词： frontier driving lightweight