检索结果-内蒙古大学图书馆

2D Ruddlesden-Popper Perovskites/PVDF-TrFE Photodetector for Anti-Interference Vision system Derived from Ferroelectric Polarization Modulation

引用

ADVANCED FUNCTIONAL MATERIALS 2025年第0期

作者： Zhang, Xinglong Hong, Enliu Tan, Xiaojun Liu, Jie Jiang, Anquan Fang, Xiaosheng Fudan Univ Dept Mat Sci State Key Lab Mol Engn Polymers Shanghai 200433 Peoples R China Shaoxin Lab Shaoxing 312000 Peoples R China Fudan Univ Sch Microelect State Key Lab ASIC&System Shanghai 200433 Peoples R China

2D Ruddlesden-Popper (RP) perovskites have garnered increasing attention for their excellent photoresponse, characterized by high carrier mobility, tunable bandgaps, high optical absorption, and molecular asymmetry. Herein, centimeter scale single crystal 2D hybrid perovskites, BA2PbBr4 (BPB) is synthesized, using quasi-static cooling method and composited with ferroelectric PVDF-TrFE(PT) film to construct a multi-field coupling photodetector (PD) via van der Waals force contact. Ferroelectric tests show that the PT film exhibits a saturated polarization strength of 3.6 mu C cm-2, allowing the ferroelectric localized field to modulate the band structure of PT and enhance the photocurrent. The Heterojunction systems exhibit ultra-high responsivity (15.3 A W-1) and detectivity (1.99 x 1013 Jones) under 390 nm illumination at 3 V bias, with a performance improvement of over 102 times compared to BPB PDs. Furthermore, the hybrid PDs exhibit highly stable I-t curve with a photocurrent retention rate of 97.4%. Leveraging this feature, a large-area imaging device is designed at the centimeter level scale, enabling multifunctional vision applications accurate letter imaging process and anti-interference number detection. The work presents a valuable insight in design of future autonomous driving vision systems.

关键词： 2D Ruddlesden-Popper perovskites ferroelectric photodetector PVDF-TrFE single-crystal

来源：评论

学校读者我要写书评

暂无评论

Automated Design of Complex Analog Circuits with Multiagent Based Reinforcement Learning 23

Automated Design of Complex Analog Circuits with Multiagent ...

引用

Proceedings of the 60th Annual ACM/IEEE Design Automation Conference

作者： Jinxin Zhang Jiarui Bao Zhangcheng Huang Xuan Zeng Ye Lu State Key Lab. of ASIC & System School of Information Science and Technology Frontier Institute of Chip and System State Key Lab. of ASIC & System Microelectronics Department Fudan University Shanghai China

ISBN: (纸本)9798350323481

Despite the effort of analog circuit design automation, currently complex analog circuit design still requires extensive manual iterations, making it labor intensive and time-consuming. Recently, reinforcement learning (RL) algorithms have been demonstrated successfully for the analog circuit design optimization. However, a robust and highly efficient RL method to design analog circuits with complex design space has not been fully explored yet. In this work, inspired by multiagent planning theory as well as human expert design practice, we propose a multiagent based RL (MA-RL) framework to tackle this issue. Particularly, we (i) partition the complex analog circuits into several sub-blocks based on topology information and effectively reduce the complexity of design search space; (ii) leverage MA-RL for the circuit optimization, where each agent corresponds to a single sub-block, and the interactions between agents delicately mimic the best design tradeoffs between circuit sub-blocks by human experts; (iii) introduce the multiagent twin-delayed techniques to further boost training stability and accomplish higher performances. Experiments on two different analog circuit topologies and knowledge transfers between two technology nodes are demonstrated. It's shown that MA-RL framework can achieve the best FoM for complex analog circuits design. This work shines the light for future large scale analog circuit system design automation.

关键词： complex analog circuits

来源：评论

学校读者我要写书评

暂无评论

Routability-Driven Macro Placement Engine for Modern FPGAs With Complex Cascade Shape and Region Constraints

引用

IEEE Transactions on Computer-Aided Design of Integrated Circuits and systems 2025年

作者： Gu, Hao Gu, Jian Peng, keyu Chen, Jianli Yang, Jun Zhu, Ziran Southeast University National ASIC System Engineering Research Center School of Integrated Circuits Nanjing210096 China Fudan University State Key Lab of ASIC and System Shanghai200433 China

Field-programmable gate array (FPGA) macro placement holds a crucial role within the FPGA physical design flow since it substantially influences the subsequent stages of cell placement and routing. With the increasing number of macros and the complex cascade shape and region constraints imposed by modern FPGAs, the routability and macro placement have become much more challenging. In this paper, we propose an effective and efficient routability-driven macro placement algorithm for modern FPGAs with cascade shape and region constraints. To reserve adequate space for cell placement and guarantee routability, we first develop a routability-driven mixed-size analytical global placement that evenly distributes both macros and cells while considering cascade shape and region constraints. Particularly, the proposed global placement engine integrates a well-trained congestion prediction model, targeting benchmarks with high routing congestion to enhance overall routability. Then, we propose an integer linear programming (ILP)-based cascade shape legalization followed by matching-based macro legalization to remove macro overlaps while satisfying the region constraints. Finally, a routability-driven detailed macro placement is proposed to refine the solution. Compared with the winners of the MLCAD 2023 FPGA macro placement contest and state-of-the-art works, experimental results show that our algorithm achieves the best overall score and routability. © 1982-2012 IEEE.

关键词： Electronic design automation

来源：评论

学校读者我要写书评

暂无评论

The Power of Graph Signal Processing for Chip Placement Acceleration 24

The Power of Graph Signal Processing for Chip Placement Acce...

引用

43rd International Conference on Computer-Aided Design, ICCAD 2024

作者： Liu, Yiting Zhou, Hai Wang, Jia Yang, Fan Zeng, Xuan Shang, Li School of Computer Science Fudan University Shanghai China Department of ECE Northwestern University Evanston United States Department of ECE IIIinois Institute of Technology Chicago United States State Key Lab of ASIC & System Microelectronics Department Fudan University Shanghai China

ISBN: (纸本)9798400710773

Placement is a critical task with high computation complexity in VLSI physical design. Modern analytical placers formulate the placement objective as a nonlinear optimization task, which suffers a long iteration time. To accelerate and enhance the placement process, recent studies have turned to deep learning-based approaches, particularly leveraging graph convolution networks (GCNs). However, learning-based placers require time- and data-consuming model training due to the complexity of circuit placement that involves large-scale cells and design-specific graph statistics. This paper proposes GiFt, a parameter-free technique for accelerating placement, rooted in graph signal processing. GiFt excels at capturing multi-resolution smooth signals of circuit graphs to generate optimized placement solutions without the need for time-consuming model training, and meanwhile significantly reduces the number of iterations required by analytical placers. Experimental results show that GiFt significantly improving placement efficiency, while achieving competitive or superior performance compared to state-of-the-art placers. In particular, compared to DREAMPlace, the recently proposed GPU-accelerated analytical placer, GF-Placer improves total runtime over 45%. © 2024 Copyright is held by the owner/author(s).

关键词： Nonlinear programming

来源：评论

学校读者我要写书评

暂无评论

Toward Optimal Filler Cell Insertion with Complex Implant Layer Constraints 23

Toward Optimal Filler Cell Insertion with Complex Implant La...

引用

Proceedings of the 60th Annual ACM/IEEE Design Automation Conference

作者： Peng Zou Guohao Chen Zhifeng Lin Jun Yu Jianli Chen State Key Lab of ASIC & System Fudan University Shanghai China Center for Discrete Mathematics and Theoretical Computer Science Fuzhou University Fuzhou China

ISBN: (纸本)9798350323481

Modern circuits often contain standard cells of different threshold voltages (multi-VTs) to achieve a better trade-off between timing and power consumption. Due to the heterogeneous cell structures, the multi-VTs cells impose various implant layer constraints, further complicating the already time-consuming filler cell insertion process. In this paper, we present a fast and near-optimal algorithm to solve the filler insertion problem with complex implant layer rules and minimum filler width constraints. We first propose an inference-driven detecting algorithm to identify each design rule violation accurately. Then, a dynamic-programming-based insertion method is developed to reduce the implant layer violations. Finally, we design a contour-driven violation refinement strategy to further improve manufacturability. Experimental results show that our algorithm can reduce the number of violations significantly compared with state-of-the-art works. Besides, with our identifier in the legalization stage, we can avoid conflicts in advance and solve almost all violations after filler insertion in industrial cases.

关键词： filler insertion

来源：评论

学校读者我要写书评

暂无评论

The Power of Graph Signal Processing for Chip Placement Acceleration

arXiv

引用

arXiv 2025年

关键词： Nonlinear programming

来源：评论

学校读者我要写书评

暂无评论

PUFFER: A Routability-Driven Placement Framework via Cell Padding with Multiple Features and Strategy Exploration 23

PUFFER: A Routability-Driven Placement Framework via Cell Pa...

引用

Proceedings of the 60th Annual ACM/IEEE Design Automation Conference

作者： Zhijie Cai Peng Zou Zhengtao Wu Xingyu Tong Jun Yu Jianli Chen Yao-Wen Chang State Key Lab of ASIC & System Fudan University Shanghai China Shanghai LEDA Technology Co. Ltd. Shanghai China Graduate Institute of Electronics Engineering National Taiwan University Taipei Taiwan and Department of Electrical Engineering National Taiwan University Taipei Taiwan

ISBN: (纸本)9798350323481

Placement is a critical stage in VLSI physical design, especially for routability optimization. Due to the large scale and high integration introduced by the advanced semiconductor manufacturing technology, there remains a significant challenge in routability in the placement stage, which will affect the subsequent routing process. This paper proposes a placement framework, called PUFFER, to optimize routability by cell padding and strategy exploration. The framework first estimates congestion by imitating the behaviors of routing detours and clustered cell spreading. Then it calculates cell padding based on multiple features inspired by the characteristics of convolutional and graph neural networks. Besides, it applies a Bayesian-based method to explore a better placement strategy. Compared with a commercial tool and the state-of-the-art academic RePlAce placer, experiments on industrial benchmarks show that our framework achieves the best routability on average, with a 2.7× speedup over the commercial tool.

关键词： physical design

来源：评论

学校读者我要写书评

暂无评论

High speed optical transmission utilizing constant envelope modulation based on frequency shift keying and minimum-shift keying

引用

Chinese Optics Letters 2010年第9期8卷 837-843页

作者：迟楠方武良邵宇丰张俊文黄博朱江波陶理 Department of Communication Science and Engineering State Key Lab of ASIC and System Fudan University

A novel 40-Gb/s constant envelope optical frequency shift keying （FSK） transmitter and the transmission characteristics are investigated both by simulation and experiment. Meanwhile, to increase the spectrum efficiency of FSK, we propose a novel optical minimum-shift keying （MSK） scheme and analyze its per-formance compared with other MSK schemes and other traditional modulation formats. Simulation and experimental results show that the novel FSK scheme could be a potential candidate for the future high speed transmission and label switching systems. And the novel MSK scheme deserves future deep research for its potential excellent performance.

关键词： Light transmission

来源：评论

学校读者我要写书评

暂无评论

Artificial Modulation of Ferroelectric Thin Films into Antiferroelectric through H^＋ Implantation for High-Density Charge Storage

引用

Chinese Physics Letters 2008年第5期25卷 1871-1874页

作者：张燕均费瑾文汤庭鳌江安全 ASIC & System State Key Lab Department of Microelectronics Fudan University Shanghai 200433

Hydrogen ions are implanted into Pb（Zro.3Tio.7）03 1014 ions/cm^2. Pseudo-antiferroelectric behaviour in thin films at the energy of 40keV with a flux of 5 x the implanted thin films is observed, as confirmed by the measurements of polarization versus electric hysteresis loops and capacitance versus voltage curves. X-ray diffrac- tion patterns show the film structures before and after H＋ implantation both to be perovskite of a tetragonal symmetry. These findings indicate that hydrogen ions exist as stable dopants within the films. It is believed that the dopants change domain-switching behaviour via the boundary charge compensation. Meanwhile, time dependence of leakage current density after time longer than lOs indicates the enhancement of the leakage cur- rent nearly in one order for the implanted film, but the current at time shorter than i s is mostly the same as that of the original film without the ionic implantation. The artificial tailoring of the antiferroelectric behaviour through H＋ implantation in ferroelectric thin films is finally proven to be achievable for the device application of high-density charge storage.

关键词： supernova explosion proto-neutron star shock wave

来源：评论

学校读者我要写书评

暂无评论

A novel OFDM-CPM modulation scheme and its application in WDM-PON

引用

Chinese Optics Letters 2010年第9期8卷 894-898页

作者：邵宇丰张俊文方武良邹书敏李欣颖黄博迟楠余思远 Department of Communication Science and Engineering and State Key Lab of ASIC & System Fudan University

A novel scheme to generate, transmit, and receive an optical orthogonal frequency division multiplexing （OFDM） continuous phase modulation （CPM） signal, which is combining minimum shift keying （MSK） coding with OFDM optical modulation, for downlink application in a 4×2.5-Gb/s wavelength division multiplexing （WDM） passive optical access network, is proposed and experimentally validated. We also realize wavelength remodulation for carrying upstream on-off keying （OOK） data to reduce the cost budget at the optical network unit. The experimental results show that the power penalties for the downlink and the uplink data after transmission over 25-km SMF-28 fiber are 0.1 dB and smaller than 0.4 dB, respectively.

关键词： Electrostatic discharge Fiber optic networks Frequency allocation Multiplexing equipment Optical communication Orthogonal frequency division multiplexing Orthogonal functions Phase modulation Wavelength division multiplexing

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：