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Faculty Publications

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Articles 2461 - 2490 of 3295

Full-Text Articles in Engineering

The Calculation Of Characteristic Impedance And Propagation Operator Associated With Isothermal And Viscous Effects In Acoustic Tubes, Dean R. Wheeler Aug 2005

The Calculation Of Characteristic Impedance And Propagation Operator Associated With Isothermal And Viscous Effects In Acoustic Tubes, Dean R. Wheeler

Faculty Publications

Chebychev type approximations are used to represent the Kelvin functions and in turn the complex Bessel functions needed in modeling the characteristic impedance and propagation operator for an acoustic tube. This technique is used to approximate the Bessel functions of the first kind of order zero and order one with complex arguments. The method is then used to approximate the ratio of Bessel functions in an effort to decrease computing time. The results are used in electrical analog expressions for computing system frequency response of miniature transducers.

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Solid-State Current Amplifier Based On Impact Ionization, Aaron R. Hawkins, Hong-Wei Lee Aug 2005

Solid-State Current Amplifier Based On Impact Ionization, Aaron R. Hawkins, Hong-Wei Lee

Faculty Publications

The operation principle, fabrication, and measurement results for a stand-alone amplifier based on impact ionization are reported. The device was built in silicon using standard microelectronic processes. Testing was performed by connecting the device to both silicon and indium-gallium-arsenide photodiodes to demonstrate its compatibility with arbitrary current sources. Preamplified leakage currents of less than 1 nA were measured along with current gains greater than 100.

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Optimizing Transmission Time Of Scalable Coded Images In Peer-To-Peer Networks, Xiao Su, Rod Fatoohi, Tao Wang Aug 2005

Optimizing Transmission Time Of Scalable Coded Images In Peer-To-Peer Networks, Xiao Su, Rod Fatoohi, Tao Wang

Faculty Publications

In this paper, we study how to optimize image transmission time in peer-to-peer networks by considering the property of bitstreams generated by image coding algorithms. Images can be either scalable coded or nonscalable coded. Since transmission of nonscalable coded images is well understood, we focus on the transmission of scalable coded images in this paper.Because scalable coding embeds lower bit-rate bitstreams into higher bit-rate bitstreams, there exists a many-to-one relationship between supplying and requesting peers. When a requesting peer asks for an image coded in a particular bit rate, multiple peers with the same image but coded in different bit …

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Decentralized Perimeter Surveillance Using A Team Of Uavs, Timothy Mclain, Randal W. Beard, Derek Kingston, Ryan S. Holt, David W. Casbeer Aug 2005

Decentralized Perimeter Surveillance Using A Team Of Uavs, Timothy Mclain, Randal W. Beard, Derek Kingston, Ryan S. Holt, David W. Casbeer

Faculty Publications

This paper poses the cooperative perimeter-surveillance problem and offers a decentralized solution that accounts for perimeter growth (expanding or contracting) and insertion/deletion of team members. By identifying and sharing the critical coordination information and by exploiting the known communication topology, only a small communication range is required for accurate performance. Simulation and hardware results are presented that demonstrate the applicability of the solution.

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Effects Of Mutual Coupling On Interference Mitigation With A Focal Plane Array, Michael A. Jensen, Karl F. Warnick Aug 2005

Effects Of Mutual Coupling On Interference Mitigation With A Focal Plane Array, Michael A. Jensen, Karl F. Warnick

Faculty Publications

A focal plane array feed of electrically small elements has been proposed as a means for achieving high sensitivity for radio astronomy applications in the presence of radio frequency interference (RFI). For a broadband system, mutual coupling effects become significant as the array element spacing becomes small relative to the electromagnetic wavelength. We present a theoretical framework for modeling the effects of mutual coupling and for determining the optimal multiport matching network between array elements and front-end transistor low-noise amplifiers for maximum signal-to-noise ratio (SNR). Numerical results are given for a model scenario including spillover and amplifier thermal noise and …

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Design And Characterization Of A Dual-Stage, Thermally Actuated Nanopositioner, Neal B. Hubbard, Larry L. Howell Aug 2005

Design And Characterization Of A Dual-Stage, Thermally Actuated Nanopositioner, Neal B. Hubbard, Larry L. Howell

Faculty Publications

A nanopositioner is presented that has two stages for independent coarse and fine position control. Thermal microactuators operate both stages. The first stage includes a bistable mechanism: it travels 52 micrometers between two discrete positions. The second stage is mounted on the first stage and moves continuously through an additional 8 micrometers in the same direction as the first stage. Three approaches to the control of the second stage were evaluated in terms of accuracy and manufacturability, and one was selected for the design of the nanopositioner. The device was surface micromachined in a two-layer polysilicon process. Experiments were performed …

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Real-Space Electron Transfer In Iii-Nitride Metal-Oxide-Semiconductor-Heterojunction Structures, S. Saygi, A. Koudymov, V. Adivarahan, J. Yang, Grigory Simin, M. Asif Khan, J. Deng, R. Gaska, M. S. Shur Jul 2005

Real-Space Electron Transfer In Iii-Nitride Metal-Oxide-Semiconductor-Heterojunction Structures, S. Saygi, A. Koudymov, V. Adivarahan, J. Yang, Grigory Simin, M. Asif Khan, J. Deng, R. Gaska, M. S. Shur

Faculty Publications

The real-space transfer effect in a SiO2∕AlGaN∕GaN metal-oxide-semiconductor heterostructure (MOSH) from the two-dimensional (2D) electron gas at the heterointerface to the oxide-semiconductor interface has been demonstrated and explained. The effect occurs at high positive gate bias and manifests itself as an additional step in the capacitance-voltage (C‐V) characteristic. The real-space transfer effect limits the achievable maximum 2D electron gas density in the device channel. We show that in MOSH structures the maximum electron gas density exceeds up to two times that at the equilibrium (zero bias) condition. Correspondingly, a significant increase in the maximum channel current (up to …

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Rotational Legged Locomotion, Damian M. Lyons, Kiran Pamnany Jul 2005

Rotational Legged Locomotion, Damian M. Lyons, Kiran Pamnany

Faculty Publications

In this paper we presented a novel, agile robot mechanism, which we call a rotopod, which combines aspects of wheeled and legged locomotion. A general description of how a tripedal rotopod can be made to step, rotating the mechanism about one leg, and moving the center of the mechanism, is presented. The concept of a gait for this mechanism is defined, and is used to show how extremely agile the mechanism can be. Specific resistance is employed as a way to explore the relative efficiency of this mechanism versus a wheel. Finally, we describe our first prototype rotopod and report …

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Rank-Based Multisensory Fusion In Multitarget Video Tracking, Damian M. Lyons, D. Frank Hsu Jul 2005

Rank-Based Multisensory Fusion In Multitarget Video Tracking, Damian M. Lyons, D. Frank Hsu

Faculty Publications

An attractive approach to improve tracking performance for visual surveillance is to use information from multiple visual sensory cues such as position, color, shape, etc. Previous work in fusion for tracking has tended to focus on fusion by numerically combining the scores assigned by each cue. We argue that for video scenes with many targets in a crowded situation, the splitting and merging of regions associated with targets, and the subsequent dramatic changes in cue values and reliabilities, renders this form of fusion less effective. In this paper we present experimental results showing that use of cue rank information in …

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Mechanics Of Hydrogenated Amorphous Carbon Deposits From Electron-Beam-Induced Deposition Of Paraffin Precursor, W. Ding, D. A. Dikin, X. Chen, R. D. Piner, R. S. Ruoff, E. Zussman, X. Wang, Xiaodong Li Jul 2005

Mechanics Of Hydrogenated Amorphous Carbon Deposits From Electron-Beam-Induced Deposition Of Paraffin Precursor, W. Ding, D. A. Dikin, X. Chen, R. D. Piner, R. S. Ruoff, E. Zussman, X. Wang, Xiaodong Li

Faculty Publications

Many experiments on the mechanics of nanostructures require the creation of rigid clamps at specific locations. In this work, electron-beam-induced deposition(EBID) has been used to depositcarbonfilms that are similar to those that have recently been used for clamping nanostructures. The film deposition rate was accelerated by placing a paraffin source of hydrocarbon near the area where the EBIDdeposits were made. High-resolution transmission electron microscopy, electron-energy-loss spectroscopy, Raman spectroscopy, secondary-ion-mass spectrometry, and nanoindentation were used to characterize the chemical composition and the mechanics of the carbonaceous deposits. The typical EBIDdeposit was found to be hydrogenated amorphous carbon (a-C:H) having …

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Improved Network Analysis Of Coupled Antenna Diversity Performance, Michael A. Jensen, Matthew L. Morris Jul 2005

Improved Network Analysis Of Coupled Antenna Diversity Performance, Michael A. Jensen, Matthew L. Morris

Faculty Publications

This paper presents a new framework for the analysis of mutually coupled diversity antennas based on network theory. The network model incorporates the matching network between the antennas and front-end amplifiers and uses a realistic model for the amplifier noise. The resulting analysis includes the impact of the coupled-antenna radiation patterns and impedance characteristics in determining the branch signal-to-noise ratios (SNRs). Application of the formulation to coupled dipole antennas characterized using full-wave electromagnetic analysis illustrates that a matching network providing a minimum amplifier noise figure achieves significantly better diversity performance than one providing maximum power transfer.

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Biomass-Coal Co-Combustion: Opportunity For Affordable Renewable Energy, Larry Lin Baxter Jul 2005

Biomass-Coal Co-Combustion: Opportunity For Affordable Renewable Energy, Larry Lin Baxter

Faculty Publications

This investigation explores the reasons for and technical challenges associated with co-combustion of biomass and coal in boilers designed for coal (mainly pulverized coal) combustion. Biomass-coal co-combustion represents a near-term, low-risk, low-cost, sustainable, renewable energy option that promises reduction in net CO2 emissions, reduction in SOx and often NOx emissions, and several societal benefits. Technical issues associated with cofiring include fuel supply, handling and storage challenges, potential increases in corrosion, decreases in overall efficiency, ash deposition issues, pollutant emissions, carbon burnout, impacts on ash marketing, impacts on SCR performance, and overall economics. Each of these issues has been investigated and …

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Correlation Of Fault-Injection To Proton Accelerator Persistent Cross Section Measurements, Keith S. Morgan, Michael J. Wirthlin Jun 2005

Correlation Of Fault-Injection To Proton Accelerator Persistent Cross Section Measurements, Keith S. Morgan, Michael J. Wirthlin

Faculty Publications

Sponsorship: Los Alamos National Laboratory. Field Programmable Gate Arrays (FPGAs) are an attractive solution for space system electronics. Unfortunately, FPGAs are susceptible to radiation-induced single-event upsets (SEU). As such, the FPGA Reliability Studies research group (http://reliability.ee.byu.edu) at Brigham Young University has studied ways to effectively measure the static, dynamic and persistent cross sections of an FPGA desgin; each of which are characterized in some way by how the part reacts to an SEU. One such method is to actually radiate an FPGA and monitor how it reacts to SEUs. A cheaper, more efficient solution is to use fault-injection to emulate …

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Predicting On-Orbit Seu Rates, Keith S. Morgan, Michael J. Wirthlin Jun 2005

Predicting On-Orbit Seu Rates, Keith S. Morgan, Michael J. Wirthlin

Faculty Publications

As process geometry sizes continue to decrease, microelectronics are becoming more vulnerable to the effects of radiation. Of particular concern are the effects of Single-Event Upsets (SEU) in Field Programmable Gate Arrays (FPGA). An SEU causes a dynamic memory element, such as a flip-flop or latch, to unwantedly change state. Since FPGAs are becoming an increasingly attractive solution for space system electronics, it is desirable to predict static on-orbit SEU rates likely to be encountered by a particular device for any particular orbit. Mean Time Between Failure (MTBF) can directly be calculated from a static SEU rate, allowing a system …

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Two-Dimensional Grain Boundary Percolation In Alloy 304 Stainless Steel, Brent L. Adams, John A. Basinger, David T. Fullwood, E. R. Homer Jun 2005

Two-Dimensional Grain Boundary Percolation In Alloy 304 Stainless Steel, Brent L. Adams, John A. Basinger, David T. Fullwood, E. R. Homer

Faculty Publications

This work was supported by the MRSEC program of the National Science Foundation under Award Number DMR-0079996. An experimentally-obtained percolation threshold for high-angle random grain boundary networks in alloy 304 stainless steel is compared to thresholds predicted by percolation theory. A discrepancy occurs in the two values (0.46 experimental and 0.65 theoretical). Possible reasons for the discrepancy are explored. The grain boundary network appears to be composed of two distinct sub-networks, with the 'outer' network acting as the dominant contributor to the percolating paths.

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Introduction To Product Design And Innovation: A Cross Disciplinary Mini Curriculum, Patricia Backer, Seth Bates Jun 2005

Introduction To Product Design And Innovation: A Cross Disciplinary Mini Curriculum, Patricia Backer, Seth Bates

Faculty Publications

For the past two years, faculty at San Jose State University (SJSU) have implemented a three- semester minicurriculum in Product Design and Manufacturing. The project follows the Project- Based Learning (PBL) model and is central to the Certificate Program in Product Design in the Mechanical Engineering Department, the Manufacturing Systems concentration in the Department of Aviation and Technology, and the Industrial Design Program in the School of Art and Design. Students in the three courses in the minicurriculum face design challenges while being instructed about the constraints of manufacturability. In each course, students develop three to four products. All products …

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A Shift In Teaching Methodology: From Instructor Led To Student Driven Multimedia Instruction, Patricia Backer Jun 2005

A Shift In Teaching Methodology: From Instructor Led To Student Driven Multimedia Instruction, Patricia Backer

Faculty Publications

Multimedia can be a powerful tool in exploring the nature of the world around us, including its technological systems. This paper describes the design, development, and evaluation of self- paced multimedia and web-based modules that are used in an advanced General Education (GE) course in the College of Engineering at San José State University. The design and development cycle of these modules began in 1994 and spanned nine years. The General Education course, Technology and Civilization (TECH 198), is designed to introduce students to the realm of history and usage of technology in society and to increase their awareness of …

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How To Start A University Business Plan Competition: The Experience Of San Jose State University, Michael Solt, Asbjorn Osland, Anuradha Basu Jun 2005

How To Start A University Business Plan Competition: The Experience Of San Jose State University, Michael Solt, Asbjorn Osland, Anuradha Basu

Faculty Publications

San Jose State University’s Silicon Valley Center for Entrepreneurship has hosted a business plan competition for the last two academic years. The purpose of the Silicon Valley Business Plan Competition (SVBPC) is to stimulate interest in entrepreneurship among students and help to create new start-ups. The winners have typically been MBA students with an engineering background. This paper documents the process of planning and implementing the SVBPC as it has evolved at San Jose State University (SJSU), the resources required, and the key challenges encountered in organizing this annual event and widening participation in the competition. The paper reports on …

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San Jose State University Based Incubators: Loosely Coupled Elements In Silicon Valley’S Entrepreneurial System, Asbjorn Osland, Burton Dean Jun 2005

San Jose State University Based Incubators: Loosely Coupled Elements In Silicon Valley’S Entrepreneurial System, Asbjorn Osland, Burton Dean

Faculty Publications

The San Jose Redevelopment Agency (RDA) fostered and continues to nurture incubators. In partnership with the RDA, San Jose State University (SJSU), through its Foundation, operates four fairly autonomous loosely coupled university based incubators (UBIs). Their primary mission is to develop start-ups. They also provide excellent learning opportunities for students. What they have not done is commercialize university or faculty intellectual property. The incubator directors are experienced business people who have the business acumen to nurture start-ups successfully, which they have done. The RDA, SJSU, the UBIs, and the incubator directors are all part of the entrepreneurial system that characterizes …

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Integration Of Computer-Based Electronics Laboratory In A Control Systems Course, Julio Garcia, Patricia Backer Jun 2005

Integration Of Computer-Based Electronics Laboratory In A Control Systems Course, Julio Garcia, Patricia Backer

Faculty Publications

The goal of this project is to adapt the work of other researchers to improve the delivery of electronics lecture and laboratory content in the Electronics & Computer Technology (ECT) area of the BS in Industrial Technology at San Jose State University. There are several other demographic factors that serve to make the delivery of instruction challenging for the department. Approximately 70% of ECT students work at least 30 hours a week. SJSU also has a diverse student population with 62% of all undergraduates identified as having non-White ethnicity. A higher percentage (69%) of the undergraduate students in the BSIT …

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Development Of Project-Based Introductory To Materials Engineering Modules, Stacy Gleixner, Elliot Douglas, Olivia Graeve, Hilary Lackritz, Laura Demsetz, Amy Moll Jun 2005

Development Of Project-Based Introductory To Materials Engineering Modules, Stacy Gleixner, Elliot Douglas, Olivia Graeve, Hilary Lackritz, Laura Demsetz, Amy Moll

Faculty Publications

This paper will discuss the progress of curriculum development under an NSF, CCLI-EMD sponsored work, “Development of Project-Based Introductory to Materials Engineering Modules” (DUE # #0341633). A multi-university team of faculty are developing six lecture and three laboratory modules for use in Introductory to Materials courses. This course is required by most engineering programs in the U.S., with an annual enrollment of 50,000 students. This freshman/ sophomore class is an ideal place to excite students about their engineering majors and expose them to engineering design experiences. PRIME Modules, Project Based Resources for Introduction to Materials Engineering, are being developed that …

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Experimental Nonlinear Tracking Control For Nonholonomic Mobile Robots With Input Constraints, Timothy Mclain, Randal W. Beard, Wei Ren, Ji-Sang Sun Jun 2005

Experimental Nonlinear Tracking Control For Nonholonomic Mobile Robots With Input Constraints, Timothy Mclain, Randal W. Beard, Wei Ren, Ji-Sang Sun

Faculty Publications

This paper presents experimental results of nonlinear trajectory tracking controllers for nonholonomic mobile robots with fixed-wing UAV-like input constraints. Programmed to emulate an unmanned air vehicle flying at constant altitude, a nonholonomic mobile robot is assigned to follow a desired trajectory to transition through a sequence of targets in the presence of static and dynamic threats. Two velocity controllers with input constraints are proposed for tracking control. Hardware results using these two velocity controllers are compared to simulation results of dynamic controllers based on nonsmooth backstepping to demonstrate the effectiveness of our approach.

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Differentiation Between Melt And Freeze Stages Of The Melt Cycle Using Ssm/I Channel Ratios, David G. Long, Ivan S. Ashcraft Jun 2005

Differentiation Between Melt And Freeze Stages Of The Melt Cycle Using Ssm/I Channel Ratios, David G. Long, Ivan S. Ashcraft

Faculty Publications

Microwave remote sensing detection of snow melt and ablation generally focuses on the detection of liquid moisture in the snow-pack. For ablation estimation, it is important to determine if wet snow is in the process of melting or freezing. The different stages of the melt cycle are observed in the diurnal variation of Tb measurements from the Special Sensor Microwave Imager (SSM/I) over Greenland. SSM/I channel ratios exhibit patterns indicating that they are sensitive to melt and freeze stages of the daily melt cycle. The horizontal to vertical polarization ratio is sensitive to surface wetness associated with melting. The 19-37-GHz …

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The Effect Of Reactor Configuration On No Conversion And Energy Consumption In Non-Thermal Plasma Parallel Tube Reactors, Morris D. Argyle, Gui-Bing Zhao, S.V.B. Janardhan Garikipati, Xudong Hu, Maciej Radosz Jun 2005

The Effect Of Reactor Configuration On No Conversion And Energy Consumption In Non-Thermal Plasma Parallel Tube Reactors, Morris D. Argyle, Gui-Bing Zhao, S.V.B. Janardhan Garikipati, Xudong Hu, Maciej Radosz

Faculty Publications

This work shows that the configuration of a pulsed corona discharge reactor strongly affects the rate of electron collision reactions. Experiments involving the decomposition of NO in N2 were performed in a reactor in which the number or parallel reactor tubes varied from 1 to 10 at a constant pressure of 147.6 kPa and ambient temperature. A previously developed lumped model of the reactions accurately predicted the effects of varying the initial concentrations of NO (from 240ppm to 593ppm) and gas residence time (from 1.93 to 742 s). With an increasing number of parallel reactor tubes, the rate of the …

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The Effect Of Oxygen On Nonthermal-Plasma Reactions Of Nitrogen Oxides In Nitrogen, Morris D. Argyle, Gui-Bing Zhao, S.V.B. Janardhan Garikipati, Xudong Hu, Maciej Radosz Jun 2005

The Effect Of Oxygen On Nonthermal-Plasma Reactions Of Nitrogen Oxides In Nitrogen, Morris D. Argyle, Gui-Bing Zhao, S.V.B. Janardhan Garikipati, Xudong Hu, Maciej Radosz

Faculty Publications

NO is mainly converted to NO2 by chemical oxidation in the presence of oxygen. Initial selectivity analysis shows that three electron collision reactions are important for NOX evolution in O2/N2. The rate constants of these reactions decrease with increasing oxygen concentration. This is because oxygen is electronegative and hence reduces the electron concentration. The rate constant of O2 dissociation by electron collision reaction is almost two orders of magnitude higher than that of N2 dissociation. NO formation occurs predominantly through N(2D) + O2 → NO + O. The critical oxygen concentration, defined as the concentration above which the NOX formation …

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Forest Fire Monitoring With Multiple Small Uavs, David W. Casbeer, Randal W. Beard, Timothy W. Mclain, Sai-Ming Li, Raman K. Mehra Jun 2005

Forest Fire Monitoring With Multiple Small Uavs, David W. Casbeer, Randal W. Beard, Timothy W. Mclain, Sai-Ming Li, Raman K. Mehra

Faculty Publications

Frequent and detailed updates of the development of a forest fire are essential for effective and safe fire fighting. Since a forest fire is typically inaccessible by ground vehicles due to mountainous terrain, small Unmanned Air Vehicles (UAVs) are emerging as a promising solution to the problem of monitoring large forest fires. In this paper we present an effective path planning algorithm for a UAV utilizing infrared images that are collected on-board in realtime. In order to demonstrate the effectiveness of our path planning algorithm in realistic scenarios, we implemented the forest fire propagation model EMBYR to simulate the time …

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Design And Performance Of A Thin-Film Calorimeter For Quantitative Characterization Of Photopolymerizable Systems, Todd M. Roper, C. Allan Guymon, Charles E. Hoyle Apr 2005

Design And Performance Of A Thin-Film Calorimeter For Quantitative Characterization Of Photopolymerizable Systems, Todd M. Roper, C. Allan Guymon, Charles E. Hoyle

Faculty Publications

A thin-film calorimeter (TFC) was designed for the quantitative characterization of photopolymerizable systems. A detailed description of its construction indicates the ease with which a TFC can be assembled and the flexibility inherent in its design. The mechanics of operation were optimized to yield a significantly faster instrument response time than other calorimetric methods such as photodifferential scanning calorimetry (photo-DSC). The TFC has enhanced sensitivity, more than an order of magnitude greater linear response range to changes in light intensity than that of the photo-DSC, resulting in the ability to measure both smaller and larger signals more accurately. The photopolymerization …

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Stratified Waveguide Grating Coupler For Normal Fiber Incidence, Gregory P. Nordin, D. M. Chambers, J. Jiang, B. Wang Apr 2005

Stratified Waveguide Grating Coupler For Normal Fiber Incidence, Gregory P. Nordin, D. M. Chambers, J. Jiang, B. Wang

Faculty Publications

We propose a new stratified waveguide grating coupler (SWGC) to couple light from a fiber at normal incidence into a planar waveguide. SWGCs are designed to operate in the strong coupling regime without intermediate optics between the fiber and the waveguide. Two-dimensional finite-difference time-domain simulation in conjunction with microgenetic algorithm optimization shows that about 72% coupling efficiency is possible for fiber (core size of 8.3 μm and ∆=0.36%) to slab waveguide (1.2- μm core and ∆=3.1%) coupling. We show that the phase-matching and Bragg conditions are simultaneously satisfied through the fundamental leaky mode.

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Tb3+-Doped K Pb2Br5: Low-Energy Phonon Mid-Infrared Laser Crystal, U. N. Roy, R. H. Hawrami, Y. Cui, S. Morgan, A. Burger, K. C. Mandal, C. C. Noblitt, S. A. Speakman, K. Rademaker, S. A. Payne Apr 2005

Tb3+-Doped K Pb2Br5: Low-Energy Phonon Mid-Infrared Laser Crystal, U. N. Roy, R. H. Hawrami, Y. Cui, S. Morgan, A. Burger, K. C. Mandal, C. C. Noblitt, S. A. Speakman, K. Rademaker, S. A. Payne

Faculty Publications

No abstract provided.

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Reducing Energy In Fpga Multipliers Through Glitch Reduction, Nathaniel Rollins, Michael J. Wirthlin Apr 2005

Reducing Energy In Fpga Multipliers Through Glitch Reduction, Nathaniel Rollins, Michael J. Wirthlin

Faculty Publications

Sponsorship: NASA Earth Science Technology Office (ESTO). While FPGAs provide exibility for performing high-performance DSP functions, they consume a significant amount of power. For arithmetic circuits, a large portion of the dynamic power is wasted on unproductive signal glitches. Pipelining can be used to significantly reduce the unproductive power wasted in signal glitches. This paper presents a methodology for estimating the amount of power consumed by glitches and applies this methodology to non-pipelined, pipelined, and digit-serial multipliers. This glitch estimation is used to evaluate these multipliers using four energy metrics: energy per operation, energy delay, energy throughput, and energy density. …

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