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Understanding transistor channel temperature in nonlinear microwave measurements and device operation

Understanding transistor channel temperature in nonlinear mi...

引用

ARFTG Conference

作者： Charles Baylis Buford Randall Jean Josh Martin Loria Wang Matthew Moldovan Hunter Miller Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA

With the widespread use of high-voltage GaN devices and other high-power transistors, understanding the heating of a device during large-signal excitation and measurement is critical, both to ensure efficient operation and to prevent destruction of devices during measurement. Device self-heating during RF excitation is directly dependent upon the power-added efficiency of operation. All DC and RF power that is not converted to output RF power is dissipated in the device as heat. When properly applied, the traditional electrothermal model used in circuit simulators adequately calculates this self heating and yields some interesting results. In this paper, it is demonstrated that the load impedance providing maximum power-added efficiency also results in the lowest average dissipated power, and hence the lowest channel temperature, of the device. The variation in average dissipated power (and hence channel temperature) is also examined for different loading conditions; it is shown that some loading conditions produce a dissipated power that is actually higher than the DC power, a situation which often can lead to device failure during load-pull measurements.

关键词： Radio frequency Power dissipation Temperature measurement Mathematical model Heating Microwave measurements Equations

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LINC power amplifiers for reducing out-of-band spectral re-growth: A comparative study

LINC power amplifiers for reducing out-of-band spectral re-g...

引用

IEEE Annual Conference on Wireless and Microwave Technology (WAMICON)

作者： Charles Baylis Matthew Moldovan Loria Wang Josh Martin Wireless and Microwave Circuits and Systems Program Department of Electrical and Computer Engineering Baylor University Waco TX USA

ISBN: (纸本)9781424466887;9781424466890

The Linear Amplification with Nonlinear Components (LINC) power amplifier structure combiner implementation has an effect on the linearity and efficiency of the design. Understanding and using this tradeoff is helpful to radar and communication designers and can be used to assist in operating with optimum efficiency while meeting spectral mask requirements instituted by regulatory agencies. In this paper, a simulation-based investigation is performed into implementations with a 180-degree coupler and with a Chireix outphasing network. In general, the overall efficiency in both designs is a function of the amplitude modulation of the message signal in the LINC configuration; however, the 180-degree coupler has a potential to obtain higher linearity in many cases due to the isolation of its two input ports. In certain cases of amplitude modulation, however, much of the output power in the 180-degree coupler design is delivered to an unused termination rather than to the network output.

关键词： Power amplifiers Linearity Amplitude modulation Radar Phase modulation Signal design Voltage Interference Microwave amplifiers Circuits and systems

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Investigations of bio markers for ion channel activities on insulinoma cells

Investigations of bio markers for ion channel activities on ...

引用

4th IEEE International Conference on Nano/Molecular Medicine and engineering, IEEE NANOMED 2010

作者： Yang, Ruiguo Xi, Ning Lai, King Wai Chiu Fung, Carmen Kar Man Qu, Chengeng Zhong, Beihua Wang, Donna H. Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48824 United States Department of Medicine Michigan State University East Lansing MI 48824 United States Guangzhou Medical College Guangzhou China Neuroscience Program Cell and Molecular Biology Program Michigan State University United States

ISBN: (纸本)9781612841533

Ion channel is the regulatory mechanism for electrical activity in pancreatic islet cells through stimulus-secretion coupling. Changes in membrane potential are regulated by the glucose concentration-dependent ion channel activities. The alteration of glucose concentration is linked to the open probability of ATP-sensitive K+ channels by insulin secretion. At the meantime, the change of glucose concentration can cause the reorganization of the membrane as well as the cytoskeleton, resulting in the change of cellular stiffness. By using an integrated AFM and cell manipulation system, we were able to measure the cell stiffness and structural change simultaneously upon the glucose stimulation. The cell stiffness increases substantially in a dosage-dependent manner after stimulation by real time AFM nanoindentation measurement. Structurally, the cell height decrease dynamically with the glucose concentration increase. Therefore we have a unique Bio Marker to characterize the ion channel activity using different modalities. This result indicates that the open and close of ion channel would lead to the change of membrane structure and thus the cell body exhibits a different cellular stiffness. The study will enhance our understanding of pancreatic islet cell stimulus coupling and insulin secretion. © 2010 IEEE.

关键词： Stiffness

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Successful women engineering students: A survey assessment to guide our efforts to boost women's retention

Successful women engineering students: A survey assessment t...

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2010 ASEE Annual Conference and Exposition

作者： Knight, Daniel Corner Sr., Katie Louie, Beverly Shoals Sr., Amber Cabrales, Cindy Integrated Teaching and Learning Program College of Engineering and Applied Science University of Colorado Boulder United States Department of Electrical and Computer Engineering University of Colorado Boulder United States Center College of Engineering and Applied Science University of Colorado Boulder United States College of Engineering and Applied Science University of Colorado Boulder United States Student Affairs Division Student Organizations Finance Office University of Colorado Boulder United States

In the fall of 2009, a college of engineering and applied science at a public, Rocky Mountain region university embarked on a new inclusive excellence initiative called Broadening Opportunity through Leadership & Diversity (BOLD). The BOLD Center is a new K-16 organizational structure to increase the performance, representation and retention through graduation of students who are underrepresented in engineering, including women, students of color, low income and first generation college attendees. A BOLD Center focus of concern is the declining retention rate of women that has dipped below that of men recently in our College. A survey consisting of 41 questions was distributed to all undergraduate engineering women in the college that incorporates scales from the Assessing Women in engineering (AWE) assessment and from the Academic Pathways of People Learning engineering Survey (APPLES). Five research questions were posed in the survey design: • Do women express a loss of interest during their program. • Is there a chilly climate for women in the college? • Do women?s self-efficacy levels change during the program. • Do academic performance levels play a role in women?s retention in engineering? • Do women have an adequate support structure in the college? The survey generated 116 responses from 2 solicitations, with women students represented from every major across all four undergraduate years. An unintended outcome was that the sample largely consists of women with high grade point averages. Thus, this paper offers insight on top performing women?s self-efficacy and their views on the college climate, the benefits from various support systems - advising, mentoring, social and financial - and the existing program.ing and initiatives that can play a role in their achievements. The results indicate that women students are interested and efficacious with respect to obtaining an engineering degree, and that the college climate is, on average, warm and accepting. Howev

关键词： Students

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The keyword-based and semantic-driven data matching approach for assisting structuralizing the textual clinical documents

The keyword-based and semantic-driven data matching approach...

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International Conference on Biomedical engineering and Informatics

作者： Chen, Chi-Huang Ping, Xiao-Ou Wang, Zi-Jun Hsieh, Sheau-Ling Chen, Li-Chin Tseng, Yi-Ju Hsu, Ching-Wei Lai, Feipei Department of Electrical Engineering National Taiwan University Taipei Taiwan Graduate Institute of Computer Science and Information Engineering National Taiwan University Taipei Taiwan Graduate Institute of Biomedical Electronic and Bioinformatics National Taiwan University Taipei Taiwan EECS International Graduate Program Institute/IT Center National Chiao Tung University Hsinchu Taiwan

ISBN: (纸本)9781424464968

The clinical data stored in the health information system can be categorized as two types including structuralized data and non-structuralized ones. In the paper, a data extraction system is developed to assist data retrieval from the non-structuralized textual clinical documents such as radiology reports, pathology reports, etc. The system provides keyword-based and semantic-driven data matching methodology to extract the specific information from the textual clinical documents. The matching methodology provides the capabilities to recognize the selected keywords and the related semantics in the documents. Through the extraction verification interface, clinicians can extract and verify the matched information semi-automatically. The extracted data can be filled into predefined case-oriented templates. The structuralized data can be stored back into the clinical data warehouse for further analyzing. Moreover, the case-oriented templates can support collecting corresponding extracted data for various researches. ©2010 IEEE.

关键词： Semantics

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Fluidic lens laparoscopic zoom camera for minimally invasive surgery

Fluidic lens laparoscopic zoom camera for minimally invasive...

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作者： Tsai, Frank S. Johnson, Daniel Francis, Cameron S. Cho, Sung Hwan Qiao, Wen Arianpour, Ashkan Lo, Yu-Hwa Department of Electrical and Computer Engineering Jacobs School of Engineering University of California San Diego San Diego CA 92093-0407 United States Materials Science and Engineering Program Jacobs School of Engineering University of California San Diego San Diego CA 92093-0418 United States Department of Surgery School of Medicine University of California San Diego San Diego CA 92093-8220 United States

We developed a miniaturized laparoscopic zoom camera that is 17 mm long, has >4X optical zoom, and works under 300 lux. This camera is suitable for advancing minimally invasive surgery. Demonstration surgery (chole... 详细信息

ISBN: (纸本)9781557528902

关键词： Laparoscopy

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Modeling GaN: Powerful but challenging

Modeling GaN: Powerful but challenging

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作者： Dunleavy, Lawrence Baylis, Charles Curtice, Walter Connick, Rick Modelithics Inc. Tampa FL United States Department of Electrical Engineering Center for Wireless and Microwave Information Systems University of South Florida Tampa United States Department of Electrical and Computer Engineering Wireless and Microwave Circuits and Systems Program Baylor University Waco TX United States W.R. Curtice Consulting Washington Crossing PA United States Triquint Semiconductor Apopka FL United States

Gallium nitride transistor-based power amplifiers (PA) which are currently among the most important technologies impacting high-power transmitter design at microwave frequencies are discussed. GaN HEMTs also allow high-power operation at much higher frequencies than silicon laterally diffused metal oxide semiconductor field-effect transistors (LDMOS FETs), currently a staple for the cellular base station industry. The significant attention placed on nonlinear models is in step with the growing community of designers who are using nonlinear circuit simulators with good success to design and optimize high-power amplifiers. The use of pulsed measurements as part of the modeling process, along with sufficiently flexible modeling equations and topologies, is critical for obtaining reliable electrothermal GaN models. The successful modeler will be aware of the need for accurate data, carefully applied extraction methodologies, along with the strengths and limitations of available models to obtain the best results for circuit designers.

关键词： Gallium nitride

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Photoluminescence of CdSe/ZnS quantum dots in GaN/quantum dots/GaN wafer bonded system

Photoluminescence of CdSe/ZnS quantum dots in GaN/quantum do...

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作者： Li, Y. Giles, A. Stokes, E. Optical Science and Engineering Graduate Program Department of Physics and Optical Science University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States Nanoscale Science Graduate Program Department of Chemistry University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States Department of Electrical and Computer Engineering University of North Carolina at Charlotte 9201 University City Boulevard Charlotte NC 28223 United States

ISBN: (纸本)9781607681908

Wafer bonding technology is applied to the GaN/quantum dots/GaN system, where CdSe/ZnS Quantum Dots serve as both the active layer and the binding layer. Photoluminescence is observed from quantum dots following wafer bonding at various temperatures under ultra high vacuum condition. Temperature dependences of bond strength and photoluminescence properties are characterized. Annealing at elevated temperature to form wafer bonds degrades photoluminescence intensity and slightly blue shifts the wavelength. Transmission Electron Microscopy is applied to study the physical properties of vacuum annealed QDs, in which agglomeration is observed. ©The Electrochemical Society.

关键词： Gallium nitride

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Feedback Control of the Spatiotemporal Firing Patterns of Neural Microcircuits

Feedback Control of the Spatiotemporal Firing Patterns of Ne...

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2010 49th IEEE Conference on Decision and Control

作者： Jianbo Liu Karim G. Oweiss Hassan K. Khalil Department of Electrical and Computer Engineering Michigan State University East Lansing MI 48823 U.S.A. Department of Electrical and Computer Engineering and the Neuroscience Program Michigan State University East Lansing MI 48823 U.S.A.

ISBN: (纸本)9781424477456

One of the fundamental objectives in systems neuroscience is to precisely control the spatiotemporal firing of cortical neurons to elicit a desired pattern of activity. In this work, we study the effects of intracortical micro-stimulation on the dynamics of a basal ganglia microcircuit model, and explore the feasibility of controlling the spatiotemporal firing patterns of the population in the presence of unobserved inputs. Results from the simulation study suggest that properly designed Multiple-Input-Multiple-Output (MIMO) feedback controller can force a subpopulation of output neurons to follow a prescribed spatiotemporal firing pattern despite the presence of unobserved inputs. The accuracy of the spike timing of the controlled neural firing with respect to the reference spike trains is in the order of tens of milliseconds. Even a simplified circuit model of Hammerstein-Wiener type can help in prescreening potential stimulation sites and analyzing the nominal stability of the closed-loop system.

关键词： Neurons Integrated circuit modeling Spatiotemporal phenomena MIMO Analytical models Mathematical model Stability analysis

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PDMS stretchable platforms for the studies of mechanical compression on neurogenesis

PDMS stretchable platforms for the studies of mechanical com...

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IEEE International Conference on Nano/Molecular Medicine and engineering (NANOMED)

作者： Leyla Esfandiari William C Tang Biomedical Engineering Interdepartmental Program University of California Los Angeles CA USA Department of Electrical Engineering and Computer Science University of California Irvine CA USA

The use of MEMS to study the effect of mechanical compression on neurogenesis has been demonstrated. Polydimethylsiloxane-(PDMS)-based stretchable platforms were used on neurosphere assay to investigate the role of mechanical forces on the formation of radial glial processes, neuronal generation and migration. To induce mechanical compression on neurospheres, The PDMS culturing substrate is patterned with micron-sized wells. Neurospheres are cultured on the prestretched device. After 48 hours, when neurospheres are grown to the size of the well's width, the stretched substrate is released. The experimental results showed that applied mechanical compression on neural stem cells cultured as neurospheres could be a factor accelerating the radial glial formation, which is associated to neurogenesis and neuronal migration.

关键词： Neurons Image coding Stem cells Substrates Embryo Fluorescence Biomembranes

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