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International Conference on Communication Technology (ICCT)

作者： Shengkai Liu Yuexing Peng Xiao Yang Yuyan Zhang Wenbo Wang Bin Wu Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China ASIC & System Department Institute of Microelectronics Chinese Academy and Sciences Beijing China

Synchronization is one of the key techniques for OFDM systems and it is of importance to implement synchronization quickly and reliably in practical OFDM systems. In this paper, we implement the synchronization method on TI C55X DSP platform for OFDM-based trunking communication system with FDD scheme, and mainly focus on the tradeoff between accuracy and complexity by combining linear interpolation and look-up table method in order to satisfy the requirement of practical application. Numerical results are presented to show the effectiveness of the proposed scheme.

关键词： AWGN Artificial neural networks OFDM Demodulation Robustness

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Compressed MIMO-OFDM channel estimation

Compressed MIMO-OFDM channel estimation

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International Conference on Communication Technology (ICCT)

作者： Yuexing Peng Xiao Yang Xiaofeng Zhang Wenbo Wang Bin Wu Key Laboratory of Universal Wireless Communications Ministry of Education Beijing University of Posts and Telecommunications Beijing China ASIC & System Department Institute of Microelectronics Chinese Academy and Sciences Beijing China

Pilot-symbol-aided channel estimation (PSACE) method is mostly employed to acquire channel state information in wireless communication systems. By exploiting the coherent sparsity of the fading channels, compressive sensing (CS) based channel estimation method can greatly decrease the pilot overhead burden. In this paper, we propose CS-based channel estimation method for MIMO-OFDM systems over frequency-selective fading channel. Based on the MIMO-OFDM channel model, we firstly prove the restricted isometry property (RIP) of the measurements by discrete partial Fourier transform (PFT)-based PSACE method, and then estimate the MIMO-OFDM channel by orthogonal matching pursuit (OMP) method. Simulation results show that the proposed method outperforms conventional least square (LS) method and greatly decrease the pilot overhead burden.

关键词： Antenna measurements Binary phase shift keying Channel estimation OFDM Bandwidth

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Thermal stability of ultrathin RuC film as Cu diffusion barrier

Thermal stability of ultrathin RuC film as Cu diffusion barr...

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2010 10th IEEE International Conference on Solid-state and Integrated Circuit Technology(第十届固态和集成电路技术国际会议 ICSICT-2010)

作者： Xin-Ping Qu Shao-Feng Ding Qi Xie Christophe Detavernier State Key lab of ASIC and System Department of Microelectronics Fudan University Shanghai 200433 Department of Solid State Science Ghent University Krijgslaan 281/S1 B-9000 Ghent Belgium

ISBN: (纸本)9781424457977

The properties of ultrathin RuC film and RuC/TaN stack as the Cu diffusion barrier on Si substrate were studied. The results show that the thermal stability of the Cu/RuC/TaN/Si structure is better than that of the Cu/Ru/TaN/Si structure. A flush TaN layer can improve the thermal stability of RuC film and make it a more robust diffusion barrier for Cu metallization.

关键词： Diffusion barrier thermal stability copper diffusion ultrathin Films

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Design and noise analysis of a fully-differential charge pump for phase-locked loops

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Journal of Semiconductors 2009年第10期30卷 126-131页

作者：宫志超卢磊廖友春唐长文 ASIC & System State Key Laboratory Fudan University Ratio Microelectronics Technology Co Ltd

A fully-differential charge pump（FDCP）with perfect current matching and low output current noise is realized for phase-locked loops（PLLs）.An easily stable common-mode feedback（CMFB）circuit which can handle high input voltage swing is *** mismatch and current noise contribution from the CMFB circuit is *** order to optimize PLL phase noise,the output current noise of the FDCP is analyzed in detail and calculated with the sampling *** calculation result agrees well with the *** on the noise analysis,many methods to lower output current noise of the FDCP are *** fully-differential charge pump is integrated into a 1–2 GHz frequency synthesizer and fabricated in an SMIC CMOS 0.18μm *** measured output reference spur is–64 dBc to–69 *** in-band and out-band phase noise is–95 dBc/Hz at 3 kHz frequency offset and–123 dBc/Hz at 1 MHz frequency offset respectively.

关键词： fully-differential charge pump mismatch noise common-mode feedback phase-locked loop

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Boundary condition and initial value effects in the reaction-diffusion model of interface trap generation/recovery

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Journal of Semiconductors 2009年第7期30卷 70-75页

作者：罗勇黄大鸣刘文军李名复 State Key Laboratory of ASIC & System Department of Microelectronics Fudan University SNDL ECE Department National University of Singapore

A simple standard reaction-diffusion（RD） model assumes an infinite oxide thickness and a zero initial interface trap density, which is not the case in real MOS *** this paper, we numerically solve the RD model by taking into account the finite oxide thickness and an initial trap *** results show that trap generation/ passivation as a function of stress/recovery time is strongly affected by the condition of the gate-oxide/poly-Si *** an absorbent boundary is considered, the RD model is more consistent with the measured interfacetrap data from CMOS devices under bias temperature *** results also show that non-negligible initial traps should affect the power index n when a power law of the trap generation with the stress time, tn, is observed in the diffusion limited region of the RD model.

关键词： reaction-diffusion model interface-trap generation/passivation negative bias temperature instability charge pumping direct-current current-voltage

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An eighth order channel selection filter for low-IF and zero-IF DVB tuner applications

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Journal of Semiconductors 2009年第11期30卷 79-87页

作者：邹亮廖友春唐长文 ASIC & System State Key Laboratory Fudan University Ratio Microelectronics Technology Co Ltd

An eighth order active-RC filter for low-IF and zero-IF DVB tuner applications is presented, which is implemented in Butterworth biquad structure. An automatic frequency tuning circuit is introduced to compensate the cut-off frequency variation using a 6-bit switched-capacitor array. Switched-resistor arrays are adopted to cover different cut-off frequencies in low-IF and zero-IF modes. Measurement results show that precise cut-off frequencies at 2.5, 3, 3.5 and 4 MHz in zero-IF mode, 5, 6, 7 and 8 MHz in low-IF mode can be achieved, 60 dB frequency attenuation can be obtained at 20 MHz, and the in-band group delay agrees well with the simulation. Two-tone testing shows the in-band IM3 achieves -52 dB and the out-band IM3 achieves -55 dB with -11 dBm input power. This proposed filter circuit, fabricated in a SMIC 0.18μm CMOS process, consumes 4 mA current with 1.8 V power supply.

关键词： active-RC filter Butterworth frequency tuning group delay noise linearity

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Inhibition of enhanced Cu oxidation on ruthenium

Inhibition of enhanced Cu oxidation on ruthenium

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IEEE International Conference on Interconnect Technology

作者： Shao-Feng Ding Qi Xie Thomas Waechtler Hai-Sheng Lu Stefan E. Schulz Xin-Ping Qu State Key lab of ASIC and System Department of Microelectronics Fudan University Shanghai China Department of Solid State Science Ghent University College Ghent Belgium ZfM and Fraunhofer ENAS Technical University of Chemnitz-Zwickau Chemnitz Germany

ISBN: (纸本)9781424476763;9781424476770

The enhanced oxidation of Cu on Ru/diffusion barriers was observed. The in-situ X-ray diffraction results reveal that the Cu oxidation can be inhibited by doping C in either Ru adhesion layer or TaN barrier layer. The RuC/barrier becomes more robust with certain amount of C doped in Ru. ALD Cu 2 O on the RuC substrate was carried out and the effect of C on reduction of Cu oxide was observed.

关键词： Oxidation Copper Annealing X-ray scattering Tin Temperature Adhesives X-ray diffraction Spectroscopy Integrated circuit interconnections

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A low-loss V-groove coplanar waveguide on an SOI substrate

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Journal of Semiconductors 2009年第7期30卷 51-53页

作者：赵宇航童家榕曾璇王勇 State Key Laboratory of ASIC & System Microelectronics Department Fudan University Shanghai IC Research and Development Center

A novel low-loss 50-Ω coplanar waveguide with V-groove on an SOI substrate is *** a CMOS-compatible process and anisotropic etching of silicon, surface silicon is removed from the *** measured results show that the V-groove coplanar waveguide causes about 50% less loss than the conventional one at a high frequency of up to 40 GHz.

关键词： SOI coplanar waveguide low loss radio frequency

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Lithography process for KrF in the sub-0.11μm node

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Journal of Semiconductors 2009年第9期30卷 146-150页

作者：赵宇航朱骏童家榕曾璇 State Key Laboratory of ASIC & System Department of MicroelectronicsFudan University Shanghai IC Research and Development Center

Currently, 200 mm wafer foundry companies are beginning to explore production feasibility under ground rules smaller than 0.11 μm while maintain the cost advantages of KrF exposure tool systems. The kl factor under 0.11 μm at 248 nm illumination will be below 0.35, which means the process complexity is comparable with 65 nm at 193 nm illumination. In this paper, we present our initial study in the CD process window, mask error factor and CD through pitch performance at the 0.09 μm ground rule for three critical layers--gate poly, metal and contact. The wafer data in the process window and optical proximity will be analyzed. Based on the result, it is shown that the KrF tool is fully capable of sub 0.11 μm node mass production.

关键词： kl factor KrF photo resist lithography

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Engineering a scalable Boolean matching based on EDA SaaS 2.0 10

Engineering a scalable Boolean matching based on EDA SaaS 2....

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IEEE International Conference on Computer-Aided Design

作者： Chun Zhang Yu Hu Lingli Wang Lei He Jiarong Tong State Key Laboratory of ASIC and System Fudan University China Electrical and Computer Engineering Department University of Alberta Canada Electrical Engineering Department University of California Los Angeles USA

ISBN: (纸本)9781424481927

Software as a Service (SaaS) 1.0 signifcantly lowers the infrastructure and maintenance cost and increases the accessibility of the software by hosting software via the web. Compared with SaaS 1.0, SaaS 2.0 is more flexible since it leverages software tools from both server and client sides with closer interaction between them. The SaaS 2.0 paradigm provides new opportunities and challenges for EDA. In this paper, we take Boolean matching, one of the core sub algorithms in logic synthesis for field programmable gate arrays (FPGAs), as a case study. We investigate the advantages and challenges of implementing a scalable EDA algorithm under SaaS 2.0 paradigm from a technical perspective. We propose SaaS-BM, a new Boolean matching algorithm customized to take full advantage of the cloud while addressing concerns such as security and the internet bandwidth limit. Extensive experiments are performed under a networked environment with concurrent accesses. Integrated into a post-mapping re-synthesis algorithm minimizing area, the proposed SaaS-BM is 863X times faster than state-of-the-art SAT-based Boolean matching with 0.5% area overhead. Compared with a recent Bloom Filter-based Boolean matching algorithm, our proposed SaaS-BM is 53X times faster on large circuits with no area overhead.

关键词： Libraries Servers Databases Boolean functions Benchmark testing Table lookup

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