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New Technique:A low drift current reference based on PMOS temperature correction technology

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Journal of Zhejiang University-Science C(Computers and Electronics) 2012年第12期13卷 937-943页

作者： Yi-die YE Le-nian HE Ya-dan SHEN institute of very large scale integrated circuits design Zhejiang University Hangzhou 310027 China

A low drift current reference based on PMOS temperature correction technology is *** achieve the minimum temperature coefficient(TC),the PMOS cascode current mirror is designed as a cross *** exchanging the bias for two layers of the self-biased PMOS cascode structure,the upper PMOS,which is used to adjust the TC together with the resistor of the self-biased PMOS cascode structure,is forced to work in the linear *** the proposed current reference is the on-chip current reference of a high voltage LED driver with high accuracy,it was designed using a CSMC 1 μm 40 V BCD *** shows that the TC of the reference current was only 23.8×10 6 /°C over the temperature range of 40-120 °C under the typical condition.

关键词： Current reference Cross structure PMOS cascode Temperature coefficient Low drift

Arithmetic Operand Ordering for Equivalence Checking

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Tsinghua Science and Technology 2007年第S1期12卷 235-239页

作者：翁延玲葛海通严晓浪任坤 institute of very large scale integrated circuits design Zhejiang University

An information extraction-based technique is proposed for RTL-to-gate equivalence checking. Distances are calculated on directed acyclic graph (AIG). Multiplier and multiplicand are distinguished on multiplications with different coding methods, with which the operand ordering/grouping information could be extracted from a given implementation gate netlist, helping the RTL synthesis engine generate a gate netlist with great similarity. This technique has been implemented in an internal equivalence checking tool, ZDIS. Compared with the simple equivalence checking, the speed is accelerated by at least 40% in its application to a class of arithmetic designs, addition and multiplication trees. The method can be easily incorporated into existing RTL-to-gate equivalence checking frameworks, increasing the robustness of equivalence checking for arithmetic circuits.

关键词： synthesis equivalence checking arithmetic circuit

A low drift curvature-compensated bandgap reference with trimming resistive circuit

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Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第8期12卷 698-706页

作者： Zhi-hua NING Le-nian HE institute of very large scale integrated circuits Zhejiang University Hangzhou 310027 China

A low temperature drift curvature-compensated complementary metal oxide semiconductor (CMOS) bandgap ref-erence is proposed.A dual-differential-pair amplifier was employed to add compensation with a high-order term of TlnT (T is the thermodynamic temperature) to the traditional 1st-order compensated *** reduce the offset of the amplifier and noise of the bandgap reference,input differential metal oxide semiconductor field-effect transistors (MOSFETs) of large size were used in the amplifier and to keep a low quiescent current,these MOSFETs all work in weak *** voltage reference's temperature curvature has been further corrected by trimming a switched resistor *** circuit delivers an output voltage of 3 V with a low dropout regulator (LDO).The chip was fabricated in Taiwan Semiconductor Manufacturing Company (TSMC)'s 0.35-μm CMOS process,and the temperature coefficient (TC) was measured to be only 2.1×10 6/°C over the temperature range of 40-125 °C after *** power supply rejection (PSR) was 100 dB @ DC and the noise was 42 μV (rms) from 0.1 to 10 Hz.

关键词： Voltage reference Bandgap Temperature compensation Low drift Resistive trimming

Parallel-pipelined Architecture of H.264 Deblocking Filter with Adaptive Dynamic Power

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Journal of Shanghai Jiaotong university(Science) 2010年第2期15卷 224-230页

作者：韦虎林涛 Department of Electronic Engineering Shanghai Jiaotong University institute of very large scale integrated circuits Tongji University

In H.264,the computational complexity and memory access of deblocking filter are variable and depend on the video contents. In this paper,a pipelined VLSI architecture of deblocking filter with adaptive dynamic power is proposed. It avoids redundant computations and memory access by precluding the blocks which can be skipped. And the vertical and horizontal edges are simultaneously processed in an advanced scan order to speed up the decoder. As a result,the dynamic power of the proposed architecture can be reduced (up to about 89%) adaptively for different videos. And the off-chip memory access is improved compared to the previous designs. Moreover,the processing capability of the proposed architecture is very appropriate for real-time deblocking of high-definition television (HDTV,1920× 1080 pixel/frame,30 frame/s video signals) video operation at 38 MHz,which significantly outperforms the previous designs from 1.25 times to 4.8 times.

关键词： deblocking filter adaptive dynamic power parallel processing pipeline H.264

A novel voltage output integrated circuit temperature sensor

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2002年第5期3卷 54-59页

作者：吴晓波赵梦恋方志刚严晓浪 institute of very large scale integrated Circuit design Zhejiang University Hangzhou China Department of Information and Electronics Zhejiang University Hangzhou China

The novel integrated circuit (IC) temperature sensor presented in this paper works similarly as a two terminal Zener, has breakdown voltage directly proportional to Kelvin temperature at 10 mV/℃, with typical error of less than ±1.0℃ over a temperature range from -50℃ to +125℃. In addition to all the features that conventional IC temperature sensors have, the new device also has very low static power dissipation ( 0.5 mW ) , low output impedance ( less than 1Ω), excellent stability, high reproducibility, and high precision. The sensor’s circuit design and layout are discussed in detail. Applications of the sensor include almost any type of temperature sensing over the range of -50℃-+125℃. The low impedance and linear output of the device make interfacing the readout or control circuitry especially easy. Due to the excellent performance and low cost of this sensor, more applications of the sensor over wide temperature range are expected.

关键词： Temperature sensing IC (integrated circuit) sensor Thermal matching

Structure evolution,dielectric,and conductivity behavior of(K_(0.5)Na_(0.5))NbO_(3)-Bi(Zn_(2/3)Nb_(1/3))O_(3) ceramics

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Journal of Advanced Ceramics 2021年第4期10卷 809-819页

作者： Tianxiang YAN Kaiyuan CHEN Chengqi LI Min LIU Jie WANG Liang FANG Laijun LIU College of Mechanical and Control Engineering&College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004China institute of Fluid Engineering Equipment Jiangsu Industrial Technology Research InstituteJiangsu UniversityZhenjiang 212013China Key Laboratory for RF circuits and Systems Ministry of Education&Key Laboratory of Large Scale Integrated DesignHangzhou Dianzi UniversityHangzhou 310018China

(1-x)K_(0.5)Na_(0.5)Nb0_(3-x)Bi(Zn_(2/3)Nb_(1/3))0_(3)((1-x)KNN-xBZN,x=0.010,0.015,0.020,0.025,and 0.030)lead-free ceramics were fabricated via a traditional solid-state *** crystal structure,microstructure,dielectric,and conductivity behavior of this system were *** with X-ray diffraction(XRD)patterns,Rietveld refinement,and dielectric spectroscopy,an orthorhombic phase was determined for x=0.010,an orthorhombic-tetragonal mixed phase was identified for x=0.015,and a rhombohedral symmetry appears in 0.020≤x≤*** 0.98KNN-0.02BZN and 0.975KNN-0.025BZN ceramics exhibit stable permittivity and low dielectric loss tangent(tan)in wide temperature ranges owing to the combination of rhombohedral-tetragonal step-like feature and the diffuse phase transition from tetragonal to *** activation energies of dielectric relaxation and conductivity behavior at high temperatures initially decrease slightly,then drop sharply,and finally decline slowly,which could be attributed to microstructure morphologies and the concentration of oxygen vacancies.

关键词： ceramic crystal structure dielectric spectroscopy oxygen vacancies

CircuitNet: an open-source dataset for machine learning applications in electronic design automation(EDA)

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Science China(Information Sciences) 2022年第12期65卷 313-314页

作者： Zhuomin CHAI Yuxiang ZHAO Yibo LIN Wei LIU Runsheng WANG Ru HUANG School of integrated circuits Peking University School of Physics and Technology Wuhan University

The electronic design automation(EDA) community has been actively exploring machine learning(ML) for very large-scale integrated computer-aided design(VLSI CAD).Many studies explored learning-based techniques for cross-stage prediction tasks in the design flow to achieve faster design convergence. Although building ML models usually requires a large amount of data,

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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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Directly modulated 25 Gbaud/s tunable in-series DFB laser array for WDM systems

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Chinese Optics Letters 2023年第1期21卷 85-90页

作者：孙振兴王亚光肖如磊王磊磊龚洋洋邱逸仁陈向飞 Key Laboratory of Intelligent Optical Sensing and Manipulation of the Ministry of Education&Nanjing University-Tongding Joint Lab for large-scale Photonic integrated circuits&National Laboratory of Solid-State Microstructures&College of Engineering and Applied Science&institute of Optical Communication Engineering Nanjing UniversityNanjing 210093China Department of Photonics and institute of Electro-Optical Engineering Taiwan Sun Yat-sen UniversityKaohsiung 80424China

In this Letter,we proposed and experimentally demonstrated a directly modulated tunable laser based on the multi-wavelength distributed feedback(DFB)laser *** lasers are placed in series to avoid the usage of an optical combiner and additional power loss.A three-section design is utilized to reduce the interference from other lasers and improve the electro-optic response ***,the reconstruction-equivalent-chirp technique is used to simplify the grating fabrication and precisely control the grating *** realized 12 channels with 100 GHz spacing with high side mode suppression ratios of above 50 *** output power of all the channels is above 14 *** 3 dB electro-optic bandwidth is above 20 GHz at a bias current of 100 mA for all four lasers.A 25 Gb/s data transmission over a standard single-mode fiber of up to 10 km is demonstrated for all 12 channels,and 50 Gb/s data per wavelength is obtained through the four-level pulse amplitude *** proposed directly modulated tunable in-series DFB laser array shows the potential for a compact and low-cost light source for wavelength division multiplexing(WDM)systems,such as next-generation front-haul networks and passive optical networks.

关键词： tunable laser directly modulated laser laser array wavelength division multiplexing