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Pdf/5990-5266EN.Pdf from a Deeper Understanding of the Data EEWeb EEWeb.com Issue 16 PULSE October 18, 2011 Gerhard Klimeck Network for Computational Nanotechnology Electrical Engineering Community It’s all about connections.EEWeb Electrical Engineering Community students hobbyists white papers discussions technical documents industry experts links engineers resources Contact Us For Advertising Opportunities reference designs 1.800.574.2791application notes [email protected] www.eeweb.com/advertisinglighting power community sensor microcontroller wireless The user-to-user forum is for everyone, from design engineers to hobbyists, to discuss technology, products, designs and more. Join the discussions that match your interest or offer your expertise to others. Join the discussion now at: www.digikey.com/techxchange Digi-Key is an authorized distributor for all supplier partners. New products added daily. © 2011 Digi-Key Corporation, 701 Brooks Ave. South, Thief River Falls, MN 56701, USA TABLE OF CONTENTS TABLE Gerhard Klimeck 4 DIRECTOR, NETWORK FOR COMPUTATIONAL NANOTECHNOLOGY OF CONTENTS Interview with Gerhard Klimeck - Professor of ECE at Purdue University nanoHUB.org - Online Simulation 8 and More BY GERHARD KLIMECK An introduction to nanoHUB, a global nanotechnology user facility. Featured Products 10 Trading Off Performance and Code 11 Space BY DAVE LACEY WITH XMOS How to optimize performance within embedded systems’ memory limits. S Parameter Causality Correction: 15 A Dissenting View BY MICHAEL STEINBERGER WITH SISOFT Steinberger offers alternatives to S parameter causality correction. RTZ - Return to Zero Comic 19 EEWeb | Electrical Engineering Community Visit www.eeweb.com 3 INTERVIEW FEATURED G erhardKlimeck INTERVIEW Network for Computational Nanotechnology How did you first Gerhard Klimeck - Professor of ECE at Purdue University become involved with nanotechnology? After my third year of college, in 1988, I came to the U.S. as an exchange student from Germany and went to Purdue. In the spring of 1989 I took a class with Professor Supriyo Datta about electron flow in ultra-small structures where quantum mechanics are important. I realized that at some point in my career the down-scaling of devices will ultimately stop when the number of atoms in material layers becomes countable at the nanometer scale. This field was called quantum electronics or quantum transport—it was very exciting and challenging. I finished my Ph.D. in January 1994 and joined the first industrial research group tational cores available • Bandstructure Lab, Quantum Dot Lab, and RTDnegf for with the label “Nanoelectronics” at • Oak Ridge Supercomputer, education and research Texas Instruments. There, we built Jaguar, over 225,000 cores the first industrial nanoelectronic modeling tool called NEMO. What is on your bookshelf? What are your favorite software tools that you use? Books about semiconductor phys- What are your favorite • NEMO – Nanoelectronic Mod- ics, quantum mechanics , nanoelec- hardware tools that you use? eling Toolkit tronics, software development, pro- • MacBook Pro gramming languages—C, C++, • nanoHUB/HUBzero software • Purdue Community Clusters, Python, Tcl, and MATLAB. • Adobe Illustrator over 20,000 computing compu- EEWeb | Electrical Engineering Community Visit www.eeweb.com 4 INTERVIEW Do you have any tricks up of presentations and derails the true How did the nanoHUB project FEATURED your sleeve? intent of the presentation, which is come about? engagement of the audience. Most How to structure public presenta- In about 1995, Professor Mark audiences are neither interested tions of any length: Lundstrom wanted to share a Unix- nor qualified to understand the based simulation tool he built by his • Spend 1/3 of the time motivating technical details. Audiences want INTERVIEW theory group with an experimentalist the problem. Everyone in the to hear about relevance and impact. audience should think that this without rewriting it for a different is a critical problem to solve. Following a nanoHUB presentation computer. The idea to share this tool overviewing these concepts can via web pages was conceived and • 1/3 of time, show beautiful be found at http://nanohub.org/re- the Purdue University Networking intuitive solutions which sources/7615. Computing Hub (PUNCH) was show insight and knowledge. created, even before standard There should be no technical web servers were available. details, but top-level insight. The technical development was Everyone in the audience I most enjoyed performed by Nirav Karpedia should feel embarrassed for under the supervision of Professors not already working on the transforming Jose Fortes and Mark Lundstrom. problem, because the solution In 1998, the PUNCH system was is apparently so easy. nanoHUB from a serving about 1,000 users with about 30 simulation tools for research and • 1/6 of the time, show technical web form-based education. That is also when the details and why you are the name nanoHUB was coined. expert in the room. Show that portal to a fully these problems in reality are In 2002 the Network for very hard to solve, and you interactive simulation Computational Nanotechnology have the technical expertise was created and I joined as a to solve them. Do not show all facility that serves technical director. In 2005 the the details for all the problems web forms-based simulation tools you solved, just pick one of the over 10,000 users were replaced by fully interactive many. Leave all other details for simulation engines with friendly backup slides that you can pull annually, with over user interfaces. Michael McLennan up in case you do get questions was the core nanoHUB architect at the end of your presentaion. 350,000 simulations. and creator of Rappture for the rapid Respond to questions like this: development of user interfaces and “Great question! Let me go to data management. A completely my backup slides and give you new delivery system for fully What has been your favorite some detail.” project? interactive simulations was built by Rick Kennell. • 1/6 of the time, summarize the The creation of nanoHUB.org as high level of your work and show a global nanotechnology user Do you have any note-worthy your plans for the future. The facility. I most enjoyed transforming engineering experiences? audience should feel that “we nanoHUB from web form-based should give him the money,” or portal to a fully interactive simulation Development of the first industrial “the job,” et cetera. facility that serves over 10,000 nanoelectronic modeling tool users annually, with over 350,000 (NEMO) that enabled quantum The piece of the presentation that in simulations. Over 180,000 users device simulation. This was done my opinion should be about 1/6 of come to nanoHUB to view lectures from 1994 to 1998 at the Central the time usually takes on 95 percent and courses on nanotechnology. Research Laboratory of Texas EEWeb | Electrical Engineering Community Visit www.eeweb.com 5 INTERVIEW Instruments in Dallas. At TI I also What direction do you see facturing companies with modeling FEATURED co-authored two U.S. patents on your business heading in the and simulation. I see that as a criti- tunneling-based memory. next few years? cal support for the regrowth of the My research will continue to sup- U.S. manufacturing base. At Purdue, I have co-authored 34 port the downscaling and optimiza- nanoHUB tools that have now served tion of nanoelectronic transistors, What challenges do you INTERVIEW over 20,000 users worldwide. plus the coupling of electronic de- foresee in our industry? vices to photons (optoelectronics, I see a substantial and ever- What are you currently photovoltaics) and phonons (ther- increasing shortage of U.S. citizens working on? moelectrics). going to graduate school to study Within my research group at Purdue, fundamental engineering. Even in I hope nanoHUB.org will grow fur- we are developing NEMO5—a other developed countries, one can ther and manage data of simulation generalized 3D, 2D, and 1D see the same trend. This includes usage and also experimental data. quantum transport simulation Germany, Japan, Korea, and even engine. Within nanoHUB.org, I’m We are now creating Manufactur- India. It will be a challenge to attract studying the behavior of users to ingHUB.org to support small manu- the brightest minds to this. ■ help support them better. Automotive, Medical, Telecom, POS LCD for Any Application Microtips Technology QVGA Green w/LED Backlight 7” High Bright From design to service, Microtips offers a variety of competitively priced Liquid Crystal Display modules which includes standard character and graphic monochrome, passive and active color displays with white LED as well as custom LCD modules and complete OEM services. 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