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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Dongge Wang Yuteng Pan Zhang Zhang Xiaofang Zhou Dan Wang Gerald E. Sobelman State Key Lab of ASIC and System Fudan University Shanghai 200433 China Department of Electrical and Computer Engineering University of Minnesota Minneapolis 55455 USA

In this paper we propose two new design techniques for floating point arithmetic units used in DSP applications, and apply them in the design of two multi-operand units for high-radix FFTs. These two multi-operand arithmetic units are a Modified two term Dot Product (MDP) unit and a Multi-operand AddSub unit (MAS). A radix-4* FFT butterfly computation block is implemented efficiently with these multioperand units. Synthesis results show that the butterfly unit built with our design is about 43％ faster and 9.5％ smaller than a conventional implementation.

关键词： Floating-point Arithmetic Radix-4 FFT Butterfly Multi-operand Floating-point operations.

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Dielectric Fresnel zone plates on optical fibers for micro-focusing applications

Dielectric Fresnel zone plates on optical fibers for micro-f...

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作者： Lu, Bing-Rui Li, Jin-Xing Guo, Hong-Bin Gao, Chen Huq, Ejaz Qu, Xin-Ping Chen, Yifang Liu, Ran State Key Lab of ASIC and System Fudan University No. 220 Handan Rd. Shanghai 200433 China Micro and Nanotechnology Centre Rutherford Appleton Laboratory Chilton Didcot Oxfordshire OX11 0QX United Kingdom School of Microelectronics Fudan University 220 Handan Road Shanghai China

In this paper, we present a novel fabrication technique for constructing light focusing lenses, dielectric Fresnel zone plates on both flat wafers and tips of plastic optical fibers (POFs). SU-8 zone plate structures are made on glass substrate by photolithography with ink-printed soft mask, and then used as the template for hot embossing on the tip of PMMA POF. Focusing behavior for both 472 and 633 nm laser beams and LEDs in different colors are observed on glass wafers and POF tips, indicating that the proposed dielectric Fresnel zone plates can be built onto both substrate by a direct hot embossing process which may lead to a high volume production at low cost. Light intensity measurement on POFs proves that light focusing is achieved while intensity is maintained. This structure is expected to have broad applications in micro-imaging, micro-focusing as well as point-of-care medical surgeries. © 2011 Elsevier B.V. All rights reserved.

关键词： Glass

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Direct metal nano-patterning on irregular substrate surfaces by reversal imprint lithography

Direct metal nano-patterning on irregular substrate surfaces...

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IEEE International Nanoelectronics Conference

作者： Lu, Bing-Rui Qu, Xin-Ping Liu, Ran Chen, Yifang Wang, Yuanyuan State Key Lab. of Asic and System Department of Microelectronics Fudan University 220 Handan Road Shanghai 200433 China Micro and Nanotechnology Center Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX United Kingdom Department of Electronic Engineering Fudan University Shanghai 200433 China

ISBN: (纸本)9781457703799

We demonstrate a new direct metal patterning method to form nanoscale patterns on irregularly shaped substrates through a reversal imprint process, called Reversal Imprint Metal Transfer (RIMT). Using commonly processed nano patterns in resist after metal deposition before lift-off procedure, instead of being removed through lift-off, the metal on top of the resist is transferred to another irregular substrate such as a tip, a sidewall, an optic fiber and a glass wedge face by a reversal imprint. This method is able to improve the efficiency of nanolithography by smplying the whole processes, while realize the possibility to create metal patterns on irregular substrates which might be extremely difficult to be achieved by conventional lithography methods. © 2011 IEEE.

关键词： Metals

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Pattern transfer of nano-scale ferroelectric PZT gratings by a reversal nanoimprint lithography

Pattern transfer of nano-scale ferroelectric PZT gratings by...

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作者： Li, Zhi-Dong Shen, Zhen-Kui Hui, Wen-Yuan Qiu, Zhi-Jun Qu, Xin-Ping Chen, Yi-Fang Liu, Ran State Key Lab of Asic and System Department of Microelectronics Fudan University Shanghai 200433 China Rutherford Appleton Laboratory STFC Chilton Didcot Oxon OX11 0QX United Kingdom Micro and Nanotechnology Centre United Kingdom School of Microelectronics Fudan University 220 Handan Road Shanghai China

Nanoscale PZT gratings are successfully transferred to a Pt substrate using reversal nanoimprint technique without any chemical etch processes. The transfer process is preliminarily studied by measuring the surface topography of PZT coated on templates before transferring as well as the transferred patterns on substrates. Piezoelectric force microscopy (PFM) and Raman spectroscopy are used to investigate the transferred PZT nanostructures after annealing. Good ferroelectric and structural properties have been demonstrated by the transferred PZT nanostructures, indicating that this reversal imprint technique is applicable for forming nanoscale PZT domains, which may lead to the manufactures of high density data storage devices at economic cost. © 2011 Elsevier B.V. All rights reserved.

关键词： Nanoimprint lithography

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General Lattice Wave Digital Filter with Phase Compensation Scheme

General Lattice Wave Digital Filter with Phase Compensation ...

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Jinyuan Zhou Xiaofang Zhou Yan Zhao Gerald E. Sobelman State Key Lab of ASIC and System Fudan University Shanghai 200433 China Dept. of Electrical and Computer Engineering University of Minnesota Minneapolis MN 55455 USA

In order to meet the requirements of different filtering specifications in a reconfigurabie platform that supports multi-standard coexistence and high data rates, a general-purpose filter is indispensable. This paper presents a new architecture of a general filter composed of a lattice wave digital filter (LWDF) that has low sensitivity and excellent stability properties. Possessing advantages of small area and low latency, this general IIR filter can also achieve approximately linear phase.

关键词： General-purpose IIR filter Lattice wave digital filter Phase Compensation.

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Silicon nanowires by combined nanoimprint and angle deposition for gas sensing applications

Silicon nanowires by combined nanoimprint and angle depositi...

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作者： Gao, Chen Xu, Zhen-Cheng Deng, Shao-Ren Wan, Jing Chen, Yifang Liu, Ran Huq, Ejaz Qu, Xin-Ping State Key Lab of ASIC and System Department of Microelectronics Fudan University Shanghai 200433 China Rutherford Appleton Laboratory Chilton Didcot Oxon OX11 0QX United Kingdom Nanoscience and Nanotechnology Micro and Nanotechnology Centre United Kingdom School of Microelectronics Fudan University 220 Handan Road Shanghai China

In this work, we demonstrate the fabrication of silicon nanowires, with their widths ranging from 22 nm to 110 nm, using the combination of bilayer nanoimprint and angle deposition. The approach makes the widths of the nanowires adjustable, offering an alternative solution for high-resolution, low-cost, and high-throughput fabrication of nanowire sensors. Using this approach, silicon nanowires with different widths are formed on the boron-doped top Si layers of the SOI substrates, and are used as sensing parts of the gas sensors. The Si nanowire sensors with wire widths of 60 nm and 90 nm demonstrate relative sensitivities of 155% and 44% to the testing gas of NO2. © 2011 Elsevier B.V. All rights reserved.

关键词： Nanowires

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A Low Power 1.0 GHz VCO in 65nm-CMOS LP-Process

A Low Power 1.0 GHz VCO in 65nm-CMOS LP-Process

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2011 IEEE 9th International Conference on asic(2011年第九届IEEE国际专用集成电路大会)

作者： Zhang Zhang Xiaoyang Zeng Xu Cheng Zhiyi Yu Electronics and Apply Physical School Hefei University of Technology Hefei 230009 Anhui China State Key Lab of ASIC & System Fudan University Shanghai 201203 China

A l.0GHz, Voltage Controlled Oscillator (VCO) fabricated in TSMC 1.2V 1P9M 65nm CMOS LP-Process is presented in the paper. The output frequency is proportional to the control voltage (Vctrl). The advantage of the architecture is very simple and easy to be realized and it aims at low power, low area and low cost. Measured results show that the VCO operates at 400 MHz to 1.6 GHz while Vctrl ranges from 0.8V to 1.4V and the tuning range is even larger than 100％. The VCO works well in Register File and consumes 0.5 mA from a 1.2-V power supply, and occupies an area of 400 μm2.

关键词： Voltage-controlled oscillators Clocks Latches CMOS integrated circuits

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

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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

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Optimization of Mixed Polarity Reed-Muller Functions using Genetic Algorithm

Optimization of Mixed Polarity Reed-Muller Functions using G...

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2011 3rd IEEE International Conference on Computer Research and Development (ICCRD 2011)(2011第三届计算机研究与发展国际会议)

作者： M. Yang Hongying Xu A.E.A. Almaini State Key Lab of ASIC & System Fudan University Shanghai China Tianjin Vocational College of Mechanics and Electricity Tianjin China School of Engineering Napier University Edinburgh UK

In this paper, genetic algorithm (GA) using parallel tabular technique is presented for the optimization of mixed polarity Reed Muller and mixed polarity dual Reed Muller functions. The algorithm is to find optimal solution among 3" different solutions for large functions. To overcome the disadvantage of the traditional tabular technique, the cost function of GA is based on parallel tabular technique, in which new terms are generated at one time instead of generating in sequence. Without generating all the polarities, the proposed algorithm is efficient in terms of CPU time and achieves 8％ improvement in average.

关键词： logic synthesis genetic algorithm computer aided design

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

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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

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