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Electrical and Computer Engineering Faculty Research & Creative Works

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Articles 1141 - 1170 of 3518

Full-Text Articles in Engineering

Full-Wave Simulation Of An Imbalanced Differential Microstrip Line With Conductor Surface Roughness, Marina Koledintseva, Tracey Vincent, Sergiu Radu May 2015

Full-Wave Simulation Of An Imbalanced Differential Microstrip Line With Conductor Surface Roughness, Marina Koledintseva, Tracey Vincent, Sergiu Radu

Electrical and Computer Engineering Faculty Research & Creative Works

This study investigates the full-wave numerical electromagnetic analysis of edge-coupled differential microstrip lines on a printed circuit board (PCB), when conductor surface roughness is taken into account. Mixed mode parameters of such lines are analyzed. The imbalance in the electric lengths of the traces causes the appearance of common-mode currents, as well as mode conversion: differential mode (DM) to common-mode (CM) and CM to DM. The presence of the solder mask on top of the PCB with microstrip traces is also taken into account. The differential lines modeled in this work are of three types: straight, bent, and curved. The …

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Physical Interpretation Of Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli May 2015

Physical Interpretation Of Radiation And Transfer Characterization Based On The Peec Method, Ying S. Cao, Li (Lijun) Jun Jiang, Albert E. Ruehli

Electrical and Computer Engineering Faculty Research & Creative Works

The characterization of power radiation and coupling has been an important research subject. The partial element equivalent circuit method (PEEC) is a powerful tool in bridging the electromagnetic modeling together with a circuit solver. Even though PEEC was a convenient tool for many quasi-static applications, in this paper, we propose a new approach for PEEC to calculate the radiated and coupled power from the distributive point of view. Formulations for both radiated and transferred powers are proposed based on a full wave PEEC model. Distributive power can be evaluated with negligible additional computational cost in PEEC implementations. The physical meaning …

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Wavelength-Selective Switch With Direct Few Mode Fiber Integration, D. M. Marom, J. Dunayevsky, D. Sinefeld, M. Blau, Roland Ryf, Nicolas K. Fontaine, M. Montoliu, S. Randel, C. Liu, B. Ercan, Mina Esmaeelpour, For Full List Of Authors, See Publisher's Website. May 2015

Wavelength-Selective Switch With Direct Few Mode Fiber Integration, D. M. Marom, J. Dunayevsky, D. Sinefeld, M. Blau, Roland Ryf, Nicolas K. Fontaine, M. Montoliu, S. Randel, C. Liu, B. Ercan, Mina Esmaeelpour, For Full List Of Authors, See Publisher's Website.

Electrical and Computer Engineering Faculty Research & Creative Works

The first realization of a wavelength-selective switch (WSS) with direct integration of few mode fibers (FMF) is fully described. The freespace optics FMF-WSS dynamically steers spectral information-bearing beams containing three spatial modes from an input port to one of nine output ports using a phase spatial light modulator. Sources of mode dependent losses (MDL) are identified, analytically analyzed and experimentally confirmed on account of different modal sensitivities to fiber coupling in imperfect imaging and at spectral channel edges due to mode clipping. These performance impacting effects can be reduced by adhering to provided design guidelines, which scale in support of …

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Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: An Adaptive Filtering Approach, Hui Geng, Jianming Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant May 2015

Selective Body Biasing For Post-Silicon Tuning Of Sub-Threshold Designs: An Adaptive Filtering Approach, Hui Geng, Jianming Liu, Pei Wen Luo, Liang Chia Cheng, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

A sub-threshold design could provide a compelling approach to power critical applications. An exponential relationship exists, however, between the delay and the threshold voltage, that makes this design-time timing closure extremely difficult, if not impossible, to achieve. Several previous studies were focused on the technique of body biasing during post-silicon tuning for delay compensation. But they were mostly for super-threshold designs where spatially correlated L eff variation dominates. They cannot be applied directly to sub-threshold designs in which purely random threshold voltage variations dominate. These works also assumed multiple body biasing voltage domains and multiple body biasing voltage levels, which …

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The Contour Deformation Method For Calculating The High-Frequency Scattered Field By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew, Ya Qiu Jin May 2015

The Contour Deformation Method For Calculating The High-Frequency Scattered Field By The Fock Current On The Surface Of The 3-D Convex Cylinder, Yu Mao Wu, Li (Lijun) Jun Jiang, Weng Cho Chew, Ya Qiu Jin

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, the high-frequency diffracted waves like the creeping waves are comprehensively analyzed by the Fock currents. On invoking the contour deformation method, the highly oscillatory Fock currents are efficiently calculated. Furthermore, the workload for the calculation of Fock currents is frequency-independent. To capture the high-frequency wave physics phenomenon, the Fock current is separated into the classical physical optics (PO) current and the nonuniform (NU)-Fock current along the shadow boundary and in the deep shadow region. To calculate the highly oscillatory scattered wave fields from the Fock current, quadratic approximations of the phase functions in the integrand are adopted. …

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Facial Structure Analysis Separates Autism Spectrum Disorders Into Meaningful Clinical Subgroups, Tayo Obafemi-Ajayi, Judith H. Miles, T. Nicole Takahashi, Wenchuan Qi, Kristina Aldridge, Minqi Zhang, Shi Qing Xin, Ying He, Ye Duan May 2015

Facial Structure Analysis Separates Autism Spectrum Disorders Into Meaningful Clinical Subgroups, Tayo Obafemi-Ajayi, Judith H. Miles, T. Nicole Takahashi, Wenchuan Qi, Kristina Aldridge, Minqi Zhang, Shi Qing Xin, Ying He, Ye Duan

Electrical and Computer Engineering Faculty Research & Creative Works

Varied cluster analysis were applied to facial surface measurements from 62 prepubertal boys with essential autism to determine whether facial morphology constitutes viable biomarker for delineation of discrete Autism Spectrum Disorders (ASD) subgroups. Earlier study indicated utility of facial morphology for autism subgrouping (Aldridge et al. in Mol Autism 2(1):15, 2011). Geodesic distances between standardized facial landmarks were measured from three-dimensional stereo-photogrammetric images. Subjects were evaluated for autism-related symptoms, neurologic, cognitive, familial, and phenotypic variants. The most compact cluster is clinically characterized by severe ASD, significant cognitive impairment and language regression. This verifies utility of facially-based ASD subtypes and validates …

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A Kalman Filter For Stereophonic Acoustic Echo Cancellation, Constantin Paleologu, Jacob Benesty, Steven L. Grant, Silviu Ciochina Apr 2015

A Kalman Filter For Stereophonic Acoustic Echo Cancellation, Constantin Paleologu, Jacob Benesty, Steven L. Grant, Silviu Ciochina

Electrical and Computer Engineering Faculty Research & Creative Works

The stereophonic acoustic echo cancellation (SAEC) scheme was recently recast by using the widely linear (WL) model, i.e., as a single-input/single-output system with complex random variables. In this paper, we present a Kalman filter with individual control factors in the context of the WL model for SAEC. As a specific feature, this algorithm uses a different level of uncertainty for each coefficient of the filter. Simulation results indicate that the proposed algorithm outperforms the recursive least-squares (RLS) algorithm, which is usually considered as the benchmark for SAEC.

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Echo Cancellation For Bone Conduction Transducers, Mohammadhossein Behgam, Steven L. Grant Apr 2015

Echo Cancellation For Bone Conduction Transducers, Mohammadhossein Behgam, Steven L. Grant

Electrical and Computer Engineering Faculty Research & Creative Works

Bone conducting transducers are attractive technologies for voice communication systems. Bone vibrators (BVs), typically located on the condyle bone, allow users to listen while leaving their outer ears open, enhancing situational awareness. Meanwhile, bone conduction microphones (BCMs), often located on the temple, increase the transmitted signal to noise ratio because they are relatively insensitive to ambient air born environmental noise. A communication headset consisting of a BV and a BCM is a natural combination of these promising technologies. The prospect of acoustic coupling between the BVs and BCMs results in acoustic echo if full-duplex communication is used. To our knowledge, …

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Q-Learning Based Dynamic Voltage Scaling For Designs With Graceful Degradation, Yu Guang Chen, Wan Yu Wen, Tao Wang, Yiyu Shi, Shih Chieh Chang Mar 2015

Q-Learning Based Dynamic Voltage Scaling For Designs With Graceful Degradation, Yu Guang Chen, Wan Yu Wen, Tao Wang, Yiyu Shi, Shih Chieh Chang

Electrical and Computer Engineering Faculty Research & Creative Works

Dynamic voltage scaling (DVS) has been widely used to suppress power consumption in modern designs. The decision of optimal operating voltage at runtime should consider the variations in workload, process as well as environment. As these variations are hard to predict accurately at design time, various reinforcement learning based DVS schemes have been proposed in the literature. However, none of them can be readily applied to designs with graceful degradation, where timing errors are allowed with bounded probability to trade for further power reduction. In this paper, we propose a Q-learning based DVS scheme dedicated to the designs with graceful …

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Analytical Clustering Score With Application To Post-Placement Multi-Bit Flip-Flop Merging, Chang Xu, Peixin Li, Guojie Luo, Yiyu Shi, Iris Hui Ru Jiang Mar 2015

Analytical Clustering Score With Application To Post-Placement Multi-Bit Flip-Flop Merging, Chang Xu, Peixin Li, Guojie Luo, Yiyu Shi, Iris Hui Ru Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

Circuit clustering is usually done through discrete optimizations, with the purpose of circuit size reduction or design-specific cluster formation. Specifically, we are interested in the multi-bit flip-flop (MBFF) design technique for clock power reduction, where all previous works rely on discrete clustering optimizations. For example, INTEGRA was the only existing post-placement MBFF clustering optimizer with a sub-quadratic time complexity. However, it degrades the wirelength severely, especially for realistic designs, which may cancel out the benefits of MBFF clustering. In this paper we enable the formulation of an analytical clustering score in nonlinear programming, where the wirelength objective can be seamlessly …

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Low-Complexity Soft-Interference Cancellation Turbo Equalisation For Multi-Input-Multi-Output Systems With Multilevel Modulations, Jingxian Wu, Longbao Wang, Chengshan Xiao Mar 2015

Low-Complexity Soft-Interference Cancellation Turbo Equalisation For Multi-Input-Multi-Output Systems With Multilevel Modulations, Jingxian Wu, Longbao Wang, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

This study presents a low-complexity soft-interference cancellation equalizer (SICE) for the turbo detection of multiple-input-multiple-output systems operating in time dispersive channels. The SICE contains three time-invariant linear filters: a feedforward filter, a causal feedback filter and an anti-causal feedback filter. The feedforward filter is designed to suppress the InterSymbol interference because of channel time dispersion and the multiplexing interference from multiple transmit antennas. The causal (or anti-causal) feedback filter is developed to remove the residual interference caused by the symbols transmitted before (or after) the symbol under detection. The filters are designed by analyzing the statistical properties of soft decisions. …

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The Fast Solver For Calculating The High Frequency Scattered Field From The Fock Current On The Surface Of The 3-D Convex Scatterer, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang Mar 2015

The Fast Solver For Calculating The High Frequency Scattered Field From The Fock Current On The Surface Of The 3-D Convex Scatterer, Yu Mao Wu, Weng Cho Chew, Li (Lijun) Jun Jiang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, we first consider the Fock current from the 3-D convex cylinder. Next, on invoking the incremental length diffraction technique (ILDC), the resultant high frequency scattered fields are expressed in terms of the Fock current. We propose the NSDP method to calculate these scattered fields. Numerical examples illustrate that the proposed NSDP method for calculating the high frequency scattered fields could achieve the frequency independent computational workload and error controllable accuracy.

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Accuracy Enhancement Of The Equivalence Principle Algorithm Based On The Meshless Spherical Surface, Xin Fu, Lijun Jiang, Zuhui Ma Mar 2015

Accuracy Enhancement Of The Equivalence Principle Algorithm Based On The Meshless Spherical Surface, Xin Fu, Lijun Jiang, Zuhui Ma

Electrical and Computer Engineering Faculty Research & Creative Works

Conventional equivalence principle algorithm (EPA) employs cubical boxes to support equivalence sources. However, it introduces strong discontinuities. In this work, a spherical surface is employed as the equivalence surface in EPA to avoid singularities from non-smooth surfaces. Further to achieve high order accuracy, meshless samples are used for the integrals on the spherical surface to avoid the equivalence surface mesh discretization. Theoretically the accuracy of EPA can be significantly improved, which was further benchmarked though numerical examples. Various meshless schemes are also discussed to achieve the optimal solution based on the spherical equivalence surface.

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Generalized Coupled-Line All-Pass Phasers, Shulabh Gupta, Qingfeng Zhang, Lianfeng Zou, Li (Lijun) Jun Jiang, Christophe Caloz Mar 2015

Generalized Coupled-Line All-Pass Phasers, Shulabh Gupta, Qingfeng Zhang, Lianfeng Zou, Li (Lijun) Jun Jiang, Christophe Caloz

Electrical and Computer Engineering Faculty Research & Creative Works

Generalized coupled-line all-pass phasers, based on cascaded C-sections (CCSs), cascaded coupled-lines (CCLs), and hybrid-cascaded (HC) coupled transmission-line sections, are presented and demonstrated using analytical, full-wave, and experimental results. It is shown that for N commensurate coupled-line sections, CCL and HC phasers exhibit N group-delay peaks per coupled-line section harmonic frequency band, in contrast to the CCS configuration, which exhibits only one peak within this band. It is also shown that for a given maximum achievable coupling-coefficient, the HC configuration provides the largest group-delay swing. A wave-interference analysis is finally applied to the various coupled-line phasers, explaining their unique group-delay characteristics …

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Cooperative Multi-Cell Mimo Downlink Precoding With Finite-Alphabet Inputs, Wenhao Wu, Kun Wang, Weiliang Zeng, Zhi Ding, Chengshan Xiao Mar 2015

Cooperative Multi-Cell Mimo Downlink Precoding With Finite-Alphabet Inputs, Wenhao Wu, Kun Wang, Weiliang Zeng, Zhi Ding, Chengshan Xiao

Electrical and Computer Engineering Faculty Research & Creative Works

This work investigates the design of linear precoders in cooperative multi-cell MIMO downlink coverage for finite-alphabet source signals. Traditional design of multi-cell MIMO downlink precoder relies on Gaussian input assumption, which may lead to performance loss when true data inputs consist of discrete non-Gaussian symbols. This work presents optimized precoders for finite-alphabet input by maximizing the sum rate under per-base station power constraints. Specifically, we propose two distributed algorithms: a finite-alphabet signal Gaussian interference gradient projection algorithm and a block diagonalization alternating optimization algorithm while supporting interference cancellation. Our numerical results demonstrate considerable performance gain in terms of approximate transmission …

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Using Social Sensors For Influence Propagation In Networks With Positive And Negative Relationships, Basak Guler, Burak Varan, Kaya Tutuncuoglu, Mohamed Nafea, Ahmed A. Zewail, Aylin Yener, Damien Octeau Mar 2015

Using Social Sensors For Influence Propagation In Networks With Positive And Negative Relationships, Basak Guler, Burak Varan, Kaya Tutuncuoglu, Mohamed Nafea, Ahmed A. Zewail, Aylin Yener, Damien Octeau

Electrical and Computer Engineering Faculty Research & Creative Works

Online social communities often exhibit complex relationship structures, ranging from close friends to political rivals. As a result, persons are influenced by their friends and foes differently. Future network applications can benefit from integrating these structural differences in propagation schemes through socially aware sensors. In this paper, we introduce a propagation model for such social sensor networks with positive and negative relationship types. We tackle two main scenarios based on this model. The first one is to minimize the end-to-end propagation cost of influencing a target person in favor of an idea by utilizing sensor observations about the relationship types …

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A Study Of Decision Process In Mcdm Problems With Large Number Of Criteria, Jian Liu, Peng Liu, Si Feng Liu, Xian Zhong Zhou, Tao Zhang Mar 2015

A Study Of Decision Process In Mcdm Problems With Large Number Of Criteria, Jian Liu, Peng Liu, Si Feng Liu, Xian Zhong Zhou, Tao Zhang

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, an effective decision process method is proposed to address the challenge in a multiple criteria decision-making (MCDM) problem because of large number of criteria. This method is based on the criteria reduction, tolerance relation, and prospect theory (PT). By building a discernibility matrix for tolerance relation (DMTR) in an MCDM problem with numerical values or interval numbers, this method first allows us to recognize a set of critical criteria from a large criteria pool and ignore the other criteria. Next, it establishes the criteria weights through the DMTR as they are usually not indicated in the data. …

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Fabrication And Characterization Of Single Crystalline 4h-Sic Mems Devices With N-P-N Homoepitaxial Structure, Feng Zhao, Allen V. Lim Feb 2015

Fabrication And Characterization Of Single Crystalline 4h-Sic Mems Devices With N-P-N Homoepitaxial Structure, Feng Zhao, Allen V. Lim

Electrical and Computer Engineering Faculty Research & Creative Works

This paper reports single crystalline 4H-SiC MEMS with homoepitaxial n-p-n structure and its resonant characteristics under electrostatic actuation. Single crystalline fully exploits the superior material properties of SiC for operations in harsh environments. Compared to previously report p-n structure, the n-p-n structure makes electrostatic actuation applicable which is essentially important for applications of resonators and actuators to sensor devices. Such n-p-n structure, complementing the p-n structure, also further extends the capability of monolithic integration between SiC MEMS and electronic devices and circuits with not only p-n configurations such as diodes, but also n-p-n configurations such as BJTs and MOSFETs, etc.

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Graphene Plasmonics For Tuning Photon Decay Rate Near Metallic Split-Ring Resonator In A Multilayered Substrate, Yongpin P. Chen, Wei E.I. Sha, Lijun Jiang, Jun Hu Feb 2015

Graphene Plasmonics For Tuning Photon Decay Rate Near Metallic Split-Ring Resonator In A Multilayered Substrate, Yongpin P. Chen, Wei E.I. Sha, Lijun Jiang, Jun Hu

Electrical and Computer Engineering Faculty Research & Creative Works

Study of photon decay rate is essential to various optical devices, where graphene is an emerging building block due to its electrical tunability. In this paper, we study photon decay rate of a quantum emitter near a metallic split-ring resonator, which is embedded in a multilayered substrate incorporating a graphene layer. Analyzing photon decay rate in such a complex multilayered system is not only computationally challenging but also highly important to experimentally realizable devices. First, the dispersion relation of graphene plasmonics supported at a dieletric/graphene/dielectric structure is investigated systematically. Meanwhile, the dispersion relation of metallic plasmonics supported at a dielectric/metal …

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Systems, Methods And Devices For Vector Control Of Permanent Magnet Synchronous Machines Using Artificial Neural Networks, Shuhui Li, Michael Fairbank, Xingang Fu, Donald C. Wunsch, Eduardo Alonso Feb 2015

Systems, Methods And Devices For Vector Control Of Permanent Magnet Synchronous Machines Using Artificial Neural Networks, Shuhui Li, Michael Fairbank, Xingang Fu, Donald C. Wunsch, Eduardo Alonso

Electrical and Computer Engineering Faculty Research & Creative Works

An example method for controlling an AC electrical machine can include providing a PWM converter operably connected between an electrical power source and the AC electrical machine and providing a neural network vector control system operably connected to the PWM converter. The control system can include a current-loop neural network configured to receive a plurality of inputs. The current-loop neural network can be configured to optimize the compensating dq-control voltage. The inputs can be d- and q-axis currents, d- and q-axis error signals, predicted d- and q-axis current signals, and a feedback compensating dq-control voltage. The d- and q-axis error …

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Counter-Doped Jte, An Edge Termination For Hv Sic Devices With Increased Tolerance To The Surface Charge, Chih Fang Huang, Hua Chih Hsu, Kuan Wei Chu, Li Heng Lee, Ming Jinn Tsai, Kung Yen Lee, Feng Zhao Feb 2015

Counter-Doped Jte, An Edge Termination For Hv Sic Devices With Increased Tolerance To The Surface Charge, Chih Fang Huang, Hua Chih Hsu, Kuan Wei Chu, Li Heng Lee, Ming Jinn Tsai, Kung Yen Lee, Feng Zhao

Electrical and Computer Engineering Faculty Research & Creative Works

In this paper, a comparison of different techniques for SiC high-voltage devices is performed using numerical simulations. In particular, the method of counter doping (CD) introduced in the junction termination extension (JTE) region to create a multizone termination effect is investigated. Simulation shows that compared with the other edge termination techniques, CD-JTE greatly reduces the sensitivity of breakdown voltage (BV) to JTE doses and surface charges. The multizone CD-JTE with outer rings shows that for a 30-μm thick epi-layer, 90% of the theoretical BV is achievable with a wide tolerance of 11 x 1012 cm2 to the JTE …

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Orientation Error Analysis And Compenstation Of Orthogonal Array With Two-Dimension Vector Sensors, Peng Han, Chao Ren, Zhongge Zhang, Grant L. Steven Jan 2015

Orientation Error Analysis And Compenstation Of Orthogonal Array With Two-Dimension Vector Sensors, Peng Han, Chao Ren, Zhongge Zhang, Grant L. Steven

Electrical and Computer Engineering Faculty Research & Creative Works

In the application of underwater target orientation using two-dimensional differential pressure vector sensors, both the elements of the vector sensors and the compensation algorithm will introduce target orientation errors. In this paper, simulation results of these target orientation errors reveal that channel response inconsistency errors contribute much more influence on the orthogonal array compared with the SNR, the target incident angle, and the unit location displacement. Based on this observation, a compensation algorithm for orientation estimation error is proposed and testing results demonstrate the efficiency of the proposed algorithm.

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Fast And Accurate Emissivity And Absolute Temperature Maps Measurement For Integrated Circuits, Hsueh Ling Yu, Yih Lang Li, Tzu Yi Liao, Tianchen Wang, Yiyu Shi Jan 2015

Fast And Accurate Emissivity And Absolute Temperature Maps Measurement For Integrated Circuits, Hsueh Ling Yu, Yih Lang Li, Tzu Yi Liao, Tianchen Wang, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

The comparison of temperatures (temperature correlation) obtained by measuring instruments and by thermal simulation is commonly necessary. Currently the way in which thermal maps are obtained by infrared thermographer yields inaccurate results since the emissivity values of all elements in an IC are ignored and measurement method assumes a constant emissivity. Without the correct settings of emissivity in infrared thermographer, the temperature variation could reach up to as high as 300 %. Coating black paint on the IC surface is a widely used method to assume the IC with constant emissivity and simplify the measurement procedures. Coating a uniform black …

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Real Time Anomaly Detection In Wide Area Monitoring Of Smart Grids, Jie Wu, Jinjun Xiong, Prasenjit Shil, Yiyu Shi Jan 2015

Real Time Anomaly Detection In Wide Area Monitoring Of Smart Grids, Jie Wu, Jinjun Xiong, Prasenjit Shil, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

The real time anomaly detection in wide area monitoring of smart grids is critical to enhance the reliability of power systems. However, capturing the features of anomalous interruption and then detecting them at real time is difficult for large-scale smart grids, because the measurement data volume and complexity increases drastically with the exponential growth of data from the immense intelligent monitoring devices to be rolled out and the need for fast information retrieval from those mass data. Most of existing anomaly detection methods fail to handle it well. This paper proposes a spatial-Temporal correlation based anomalous behavior model to capture …

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Opportunistic Through-Silicon-Via Inductor Utilization In Lc Resonant Clocks: Concept And Algorithms, Umamaheswara Rao Tida, Varun Mittapalli, Cheng Zhuo, Yiyu Shi Jan 2015

Opportunistic Through-Silicon-Via Inductor Utilization In Lc Resonant Clocks: Concept And Algorithms, Umamaheswara Rao Tida, Varun Mittapalli, Cheng Zhuo, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

LC resonant clock is an attracting option for low power on-chip clock distribution designs. However, a major limiting factor to its implementation is the large area overhead due to the conventional spiral inductors. On the other hand, idle through-silicon-vias (TSVs) in three-dimensional integrated circuits (3D ICs) can form vertical inductors with minimal footprint and little noise coupling with horizontal traces, particularly suitable for the application of LC resonant clock. However, due to the strict constraints on the location of idle TSVs, the use of the TSV inductor is limited by the constrained choices of its location, inductance and quality factor. …

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Random Walk Based Capacitance Extraction For 3d Ics With Cylindrical Inter-Tier-Vias, Wenjian Yu, Chao Zhang, Qing Wang, Yiyu Shi Jan 2015

Random Walk Based Capacitance Extraction For 3d Ics With Cylindrical Inter-Tier-Vias, Wenjian Yu, Chao Zhang, Qing Wang, Yiyu Shi

Electrical and Computer Engineering Faculty Research & Creative Works

Three-dimensional integrated circuits (3D ICs) make use of the vertical dimension for smaller footprint, higher speed, lower power consumption, and better timing performance. In 3D ICs, the inter-tier-via (ITV) is a critical enabling technique because it forms vertical signal and power paths. Accordingly, it is imperative to accurately and efficiently extract the electrostatic capacitances of ITVs using field solvers. Unfortunately, the cylindrical via shape presents major challenges to most of the existing methods. To address this issue, we develop a novel floating random walk (FRW) method by rotating the transition cube to suit the cylindrical surface and devising a special …

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Efficient Calculation Of Large Finite Periodic Structures Based On Surface Wave Analysis, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang Jan 2015

Efficient Calculation Of Large Finite Periodic Structures Based On Surface Wave Analysis, Xiaoyan Y.Z. Xiong, Ling Ling Meng, Li (Lijun) Jun Jiang, Wei E.I. Sha, Fan Yang

Electrical and Computer Engineering Faculty Research & Creative Works

The electromagnetic modeling of practical finite periodic structures is a topic of growing interest. Due to the truncation of infinite periodic structures, surface waves will be excited and localized near discontinuous interfaces leading to the edge effect. In this work, surface waves are numerically extracted and their magnitudes and decay rates are analyzed for different materials and geometries. Based on the exponential decay of the surface wave, a novel method is developed by connecting the solution to the large finite array problem with that to a relatively small one to achieve low complexity and memory consumption. The method numerically reconstructs …

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Dispersion Characteristics Analysis Of One Dimensional Multiple Periodic Structures And Their Applications To Antennas, Zi Long Ma, Li (Lijun) Jun Jiang, Shulabh Gupta, Wei E.I. Sha Jan 2015

Dispersion Characteristics Analysis Of One Dimensional Multiple Periodic Structures And Their Applications To Antennas, Zi Long Ma, Li (Lijun) Jun Jiang, Shulabh Gupta, Wei E.I. Sha

Electrical and Computer Engineering Faculty Research & Creative Works

This paper proposes a general characterization of one dimensional multiple periodic (MP) structures for electromagnetic transmission and radiation. Studies are conducted from three aspects: Firstly, the dispersion relations of non-dispersive (conventional) and dispersive (composite right/left-handed (CRLH)) materials are analyzed. Regarding each category of materials, detailed analyses for distributed layered media and lumped circuits are presented. Through studies, we found that the periodicity increase opens up multiple stopbands. According to our physical explanations and numerical results, the relation between stopbands and periodicity is clarified. Additionally, the periodicity increase also reduces the separation distance of space harmonic modes along the phase constant …

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Future Internet Resilience For Massive Failures, Yufei Cheng, Egemen K. Çetinkaya, James P. G. Sterbenz Jan 2015

Future Internet Resilience For Massive Failures, Yufei Cheng, Egemen K. Çetinkaya, James P. G. Sterbenz

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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Modelling Robustness Of Critical Infrastructure Networks, Srinath Pinnaka, Rajgopal Yarlagadda, Egemen K. Çetinkaya Jan 2015

Modelling Robustness Of Critical Infrastructure Networks, Srinath Pinnaka, Rajgopal Yarlagadda, Egemen K. Çetinkaya

Electrical and Computer Engineering Faculty Research & Creative Works

No abstract provided.

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