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50th Anniversary Issue CAE Software Calculates Unknowns Simulation software is now a normal component of a well-balanced design process. — Jack Browne November 2011 CAE: Do Designers Trust Their Tools? Electronic-design-automation (EDA) tools are used for a variety of simulation and modeling tasks—from developing matching circuits for amplifiers through complete system simulation. — Janine Love November 2011 Nonlinear Modeling Simulates Real Conditions Software-based models of electronic devices and components for use in RF/microwave designs have long dealt exclusively with linear behavior. — Jack Browne November 2011 Software Advances As Computers Improve Computer-aided-engineering (CAE) software is a recent development when viewed over the past 50 years of this industry. — Jack Browne February 2011 Free Software Computes Impedance Transitions Matching impedances is essential to achieving reflection-free signal flow in passive high-frequency circuits and high efficiency in active circuits. although most engineers have preferred approaches to matching impedances to a system’s characteristic impedance—typically 50 O in RF/microwave circuits—materials supplier Rogers Corporation offers a backup plan that doesn’t cost a thing: the company’s... — Jack Browne December 2010 Model PAs With Wideband Signals Effective modeling of power amplifiers (PAs) must often include any memory effects that can impact an amplifier’s linearity. Such effects arise from the influences of self-heating, bias circuitry, and other sources and can hinder any efforts to develop linearization schemes for PAs. To better understand the dynamics of such effects, PA behavioral models were developed, both with and without memory effects, using realistic multicarrier wideband... — November 2010 Software Takes On Design “Wild Cards” Software has taken an increasingly dominant role in the design process—from the controlling code for today’s test and measurement equipment to solvers, simulators, and layout tools that are speeding the development of devices, circuits, and systems. Computer designs and simulations are closing the gap between predicted and measured results, thanks to the fact that the software accounts for more variables than ever before. ... — Nancy Friedrich November 2010 Model Surface Effects On Power Dissipation Due to the decreasing skin depth of printed-circuit boards (PCBs) used for high-speed analog and digital circuits, surface roughness plays an important role in determining electrical performance. The effect of roughness on power dissipation has been considered an electromechanical coupling (EC) issue, studied by simultaneous mechanical and electromagnetic (EM) analyses, but with limited success. So, an EC model was developed as an effective analysis... — Na Li , et al. November 2010 Paris Points The Way To RF Design And Analysis “Active, ambitieuse et un vision pour l’avenir’’ is how the French might summarize this latest European Microwave Week (EuMW) event. As a journalist, I’ve reported on a lot of industry events. As a result, I can easily get a feel for how an industry is doing by gauging the atmosphere and feedback from companies exhibiting at an event. This year’s EuMW was unquestionably the most positive event on which I’ve reported for the past four years. How so? A... — Paul Whytock October 2010 Design A B3G Receiver Front End Markets for mobile communications appear to be poised for growth, given the desire of wireless network customers for increased voice, data, and video services. Current third-generation (3G) networks offer considerably more capability than earlier second-generation (2G) systems, but problems arise when newer equipment is not compatible with earlier standards. These problems will only be compounded by the installation and emergence of ... — Yuannian Qin , et al. August 2010 Software Speeds Simulation Of Phased-Array Antenna BECAUSE OF MAIN-BEAM SCANNING, assessing the performance of a phased-array antenna usually involves the repeated calculation of its far field. Unfortunately, the time-consuming brute-force method comprises the calculation followed by the summation of a large number of complex exponentials, which represent the individual contributions of the array elements to the far field. For an array antenna populated by 1000 array elements, calculating that far field... — Nancy Friedrich August 2010 Software Supports Nonlinear Behavioral Modeling WITH THE RELEASE OF the 2010 Microwave Office (MWO) design suite, engineers are promised new functionality and tools to increase productivity in the design of high-frequency monolithic microwave integrated circuits (MMICs), microwave integrated circuits (MICs), RF printed-circuit boards (PCBs), and modules. The release supports nonlinear behavioral modeling via Agilent’s X-parameters, Mesuro’s Cardiff model, and more. In addition, it delivers improved speed in ... — Nancy Friedrich July 2010 EM Simulators Improve With Age Electromagnetic (EM) simulation has long been an essential modeling tool for RF /microwave design. Before selecting a simulator, however, it helps to understand the differences among EM solvers. On the simplest level, an EM simulator can be as basic as a cross-sectional analysis tool to derive parameters for a transmission line. For more complex structures, EM simulators can be differentiated by programs designed to analyze planar... — Jack Browne July 2010 Form Microstrip Couplers With Shielded Membranes Membrane-supported transmission lines and circuits are excellent candidates for millimeter-wave applications where conventional substrate-supported architectures begin to suffer from parasitic effects at the dielectric/ air interface.1-3 Transmission lines based on the technology, known as shielded-membrane-microstrip (SMM) transmission lines, have been used to realize an asymmetric tapered coupled-line coupler operating from 10 to 60... — Nasreddine Ben Ahmed , et al. June 2010 Software Facilitates Filter Synthesis TARGETING THE SMART-GRID MARKET, a new wireless subsystem can be easily integrated into applications like electric meters, industrial machinery, home appliances, and thermostats. Dubbed the SyNode 3020 (SN3020), this smart-energy embedded wireless module is fully ZigBee compliant. It supports both the Smart Energy and Home Automation profiles. The SN3020 integrates a ZigBee system-on-a-chip (SoC) transceiver, power amplifier (PA), and lownoise ... — Nancy Friedrich April 2010 Design MMICs On A Budget Designing a monolithic microwave integrated circuit (MMIC) implies million-dollar mask sets and expensive computer-aided-engineering (CAE) software. But for those on a budget, is it possible to be fiscally responsible and still create a MMIC? To explore the possibilities, a GaAs low-noise amplifier (LNA) was chosen as an example target design, since it can be created by means of a linear circuit simulator and an S-parameter file, including noise data, as supplied... — John E. Penn April 2010 Math/EM Software Solves Circuit Problems Software simulation has largely taken the place of “trial-and-error” prototypes in fine-tuning high-frequency designs. Two of the types of software tools often used by RF and microwave engineers are mathematical and electromagnetic (EM) field simulators. Although math tools can be applied for analysis in almost all scientific fields, they can also be run with electrical engineering modules. And EM simulators have leveraged the increased computing power... — Jack Browne March 2010 Bring Measurement Equipment Into System Simulation DURING THE SIMULATION of a complete subsystem, the quality of the measurement data is critical to determining whether the finished product will meet or exceed the demands faced by the system when in use. Ideally, that measurement data will allow engineers to save time and money by making changes to the system earlier in the design process. Of course, that capability requires a direct link between the system simulation software and measurement equipment. One... — Nancy Friedrich March 2010 LTE Signal-Fading Simulator Profiles Handsets Rather than having to buy and cable together two separate test instruments, engineers working on fourth-generation (4G) Long Term Evolution (LTE) handsets can now rely on a onebox test system for cell-phone signal fading simulation. This fading simulator option is integrated within the 7100 series digital-radio test set. That signal generator and analyzer covers 70 MHz to 6 GHz continuously with resolution of 1 Hz to 3 GHz and 2 Hz above 3 GHz. To... — Nancy Friedrich February 2010 Shooting Bouncing Ray Method Is At Solver’s Roots DARMSTADT, GERMANY—CST Microwave Studio (CST MWS) now incorporates an asymptotic solver that is based on the Shooting Bouncing Ray method—an extension to physical optics. The integration of CST Microstripes into the CST Studio Suite should facilitate access to features that are particularly valuable in EMC simulations, such as compact models and Octree meshing, within the design environment. The software is capable of tackling simulations covering thousands of... — Paul Whytock  prev. page
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