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An analytical model for coplanar waveguide on silicon-on-insulator substrate with conformal mapping technique

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chinese Physics B 2011年第1期20卷 98-104页

作者：何大伟程新红王中健徐大伟宋朝瑞俞跃辉 State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences graduate university of the chinese academy of sciences

In this paper, the authors present an analytical model for coplanar waveguide on silicon-on-insulator substrate. The four-element topological network and the conformal mapping technique are used to analyse the capacitance and the conductance of the sandwich substrate. The validity of the model is verified by the full-wave method and the experimental data. It is found that the inductance, the resistance, the capacitance and the conductance from the analytical model show they are in good agreement with the corresponding values extracted from experimental Sparameter until 10 GHz.

关键词： coplanar waveguide silicon-on-insulator conformal mapping

Testing content addressable memories with physical fault models

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Journal of Semiconductors 2009年第8期30卷 109-115页

作者：马麟杨旭钟石强陈云霁 Institute of Computing Technology Chinese Academy of Sciences graduate university of the chinese academy of sciences

Content addressable memory （CAM） is widely used and its tests mostly use functional fault models. However, functional fault models cannot describe some physical faults exactly. This paper introduces physical fault models for write-only CAM. Two test algorithms which can cover 100% targeted physical faults are also proposed. The algorithm for a CAM module with N-bit match output signal needs only 2N＋2L＋4 comparison operations and 5N writing operations, where N is the number of words and L is the word length. The algorithm for a HIT-signal-only CAM module uses 2N＋2L＋5 comparison operations and 8N writing operations. Compared to previous work, the proposed algorithms can test more physical faults with a few more operations. An experiment on a test chip shows the effectiveness and efficiency of the proposed physical fault models and algorithms.

关键词： content addressable memory test algorithm physical fault model

An area-saving dual-path loop filter for low-voltage integrated phase-locked loops

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Journal of Semiconductors 2009年第10期30卷 115-120页

作者：潘杰杨海钢杨立吾 Institute of Electronics Chinese Academy of Sciences graduate university of the chinese academy of sciences RF Application Group SMIC

This paper proposes an area-saving dual-path loop filter（LPF）for low-voltage integrated phase-locked loops（PLLs）.With this LPF,output current of the lowpass-path charge-pump（CP）is B times（B〉1）as great as that of the integration-path *** adding voltages across these two paths,the zero-capacitance is magnified B times *** a result,the chip size is greatly *** on this LPF,a 1.2 V 3.5 GHz-band PLL is fabricated in SMIC 0.18μm RFCMOS *** zero-capacitance is only 1/30 of that in conventional second-order LPFs. Measured data show that,at a frequency of 3.20 GHz,phase noise is–120.2 dBc/Hz at 1 MHz offset,reference spur is–72 dBc,and power is 24 mW.

关键词： area-saving dual-path loop filter charge-pump phase-locked loop

A 10 Gb/s receiver with half rate period calibration CDR and CTLE/DFE combiner

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Journal of Semiconductors 2009年第4期30卷 106-112页

作者：高茁杨宗仁赵莹杨袆张璐黄令仪胡伟武 Institute of Computing Technology Chinese Academy of Sciences graduate university of the chinese academy of sciences

This paper presents the design of a 10 Gb/s low power wire-line receiver in the 65 nm CMOS process with 1 V supply voltage. The receiver occupies 300×500 μm2. With the novel half rate period calibration clock data recovery （CDR） circuit, the receiver consumes 52 mW power. The receiver can compensate a wide range of channel loss by combining the low power wideband programmable continuous time linear equalizer （CTLE） and decision feedback equalizer （DFE）.

关键词： serial link receiver CDR equalizer

Investigation of acetylated kapok fibers on the sorption of oil in water

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Journal of Environmental sciences 2013年第2期25卷 246-253页

作者： Jintao Wang Yian Zheng Aiqin Wang Center of Eco-material and Green Chemistry Lanzhou Institute of Chemical PhysicsChinese Academy of Sciences graduate university of the chinese academy of sciences

Kapok fibers have been acetylated for oil spill cleanup in the aqueous environment. The structures of raw and acetylated kapok fiber were characterized using Fourier transform infrared （FT-IR） spectroscopy and scanning electron microscopy （SEM）. Without severe damage to the lumen structures, the kapok fibers were successfully acetylated and the resulting fibers exhibited a better oil sorption capacity than raw fibers for diesel and soybean oil. Compared with high viscosity soybean oil, low viscosity diesel shows a better affinity to the surface of acetylated fibers. Sorption kinetics is fitted well by the pseudo second-order model, and the equilibrium data can be described by the Freundlich isotherm model. The results implied that acetylated kapok fiber can be used as the substitute for non-biodegradable oil sorption materials.

关键词： kapok fiber acetylated oil sorption capacity kinetics isotherms

A fast-locking all-digital delay-locked loop for phase/delay generation in an FPGA

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Journal of Semiconductors 2011年第10期32卷 139-146页

作者：陈柱佳杨海钢刘飞王瑜 Institute of Electronics Chinese Academy of Sciences graduate university of the chinese academy of sciences

A fast-locking all-digital delay-locked loop（ADDLL） is proposed for the DDR SDRAM controller interface in a field programmable gate array（FPGA）.The ADDLL performs a 90°phase-shift so that the data strobe（DQS） can enlarge the data valid window in order to minimize *** order to further reduce the locking time and to prevent the harmonic locking problem,a time-to-digital converter（TDC） is proposed.A duty cycle corrector（DCC） is also designed in the ADDLL to adjust the output duty cycle to 50%.The ADDLL,implemented in a commercial 0.13μm CMOS process,occupies a total of 0.017 mm^2 of active *** results show that the ADDLL has an operating frequency range of 75 to 350 MHz and a total delay resolution of 15 *** time interval error（TIE） of the proposed circuit is 60.7 ps.

关键词： all digital DLL DDR SDRAM controller time-to-digital converter duty cycle corrector DCDL FPGA

Tunable and Switchable Narrow Bandwidth Semiconductor-Saturable Absorber Mirror Mode-Locked Yb-Doped Fiber Laser Delivering Different Pulse Widths

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chinese Physics Letters 2016年第3期33卷 36-39页

作者：王兆坤邹峰王子薇杜松涛周军 Shanghai Key Laboratory of Solid State Laser and Application and Shanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences graduate university of the chinese academy of sciences

The wavelength-tunable and switchable narrow bandwidth mode-locking operation is demonstrated in an all fiber laser based on semiconductor-saturable absorber mirror （SESAM）. Two narrow-band fiber Bragg gratings centered at 1029.9nm and 1032nm respectively with a polarization controller inserted between them are used to realize the wavelength switchable between 1029.9nm and 1032nm. The laser delivers different pulse widths of 7.5ps for 1030nm and 20ps for 1032nm. The maximum output power for both could reach -6.5mW at single pulse operation. The output wavelength couM be tuned to about *** intervals ranging from 1030.2nm to 1031.1 nm and from 1032.15nm to 1033.7nm with the temperature change of the fiber Bragg grating, respectively.

关键词： mode in Yb of Tunable and Switchable Narrow Bandwidth Semiconductor-Saturable Absorber Mirror Mode-Locked Yb-Doped Fiber Laser Delivering Different Pulse Widths nm

Design and fabrication of a micro electromagnetic vibration energy harvester

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Journal of Semiconductors 2011年第10期32卷 74-77页

作者：王鹏李伟车录锋 State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and Information TechnologyChinese Academy of Sciences graduate university of the chinese academy of sciences State Key Laboratory of Transducer Technology Shanghai Institute of Microsystem and lnformation TechnologyChinese Academy of Sciences

This paper presents a new micro electromagnetic energy harvester that can convert transverse vibration energy to electrical *** mainly consists of folded beams,a permanent magnet and copper planar *** calculated value of the natural frequency is 274 Hz and electromagnetic simulation shows that the magnetic flux density will decrease sharply with increasing space between the magnet and coils.A prototype has been fabricated using MEMS micromachining *** testing results show that at the resonant frequency of 242 Hz,the prototype can generate 0.55μW of maximal output power with peak-peak voltage of 28 m V for 0.5g（g = 9.8 m/s^2） external acceleration.

关键词： electromagnetic energy harvester MEMS resonance permanent magnet

Suppression of extension of the photo-sensitive area for a planar-type front-illuminated InGaAs detector by the LBIC technique

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Journal of Semiconductors 2010年第1期31卷 17-21页

作者：李永富唐恒敬李淘朱耀明姜佩璐乔辉李雪龚海梅 State Key Laboratories of Transducer Technology Shanghai Institute of Technical PhysicsChinese Academy of Sciences Key Laboratory of Infrared Imaging Materials and Detectors Shanghai Institute of Technical PhysicsChinese Academy of Sciences graduate university of the chinese academy of sciences

To suppress the extension of the photo-sensitive area of a planar-type InGaAs detector, the structure of the detector was modified, and the small-diffusion-area diffusion method, circle-type covering contact and guard-ring were introduced. The laser-beam-induced-current （LBIC） technique was used to study the photo responsive characteristics of the photo-sensitive area of different detector structures. It was indicated that, by modifying the size of the diffusion area, the width of the circle-type covering contact, the distance between the guard-ring and the photo-sensitive area and the working status of the guard-ring, extension of the photo-sensitive area could be effectively suppressed, and the detector photo-sensitive area could be exactly defined.

关键词： InGaAs photodiode LBIC planar type device photo-sensitive area