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White Papers

Visual System Simulator and TestWave Software Integrate Measurement Data into the Design Process

This white paper presents examples illustrating how VSS/TestWave software from AWR enables engineers to design communications systems with the highest possible performance by integrating the once distinct domains of simulation and measurement.
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R&S MATLAB® Toolkit for Signal Generators and Power Sensors

MATLAB is widely used for the simulation of communication systems as well as for the creation or analysis of custom signals. The MATLAB Toolkit provides functions that link the Rohde & Schwarz instruments to the MATLAB environment. For this purpose the toolkit contains scripts for the most common tasks, such as instrument remote control and data transfer.
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New Measurement-based Models Enhance Nonlinear Analysis

Recent developments in measurement and modeling technology have focused on technology-independent, measurement-based black box models. This white paper examines the different nonlinear models and measurement systems available today and how they can be used with Microwave Office®, a leading high-frequency design environment from AWR Corporation.
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MIMO Over-the-Air Testing

Traditional conducted-signal testing of mobile devices provides a more repeatable testing environment than testing with a radiated signal. However, the planned evolution of Fourth-Generation (4G) wireless technologies is critically dependent on Multiple-Input Multiple-Output (MIMO) antenna configurations, which promise significant data-rate increases based on moderate increases in complexity. Therefore, an over-the-air (OTA) testing methodology is needed to account for antenna behavior within the device evaluation.
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Solutions for Characterizing High-power Devices

High-power devices are common building blocks in RF and microwave communication systems. One such device, the high-power amplifier, plays an especially critical role in today’s mobile phones, base stations for cellular and mobile wireless infrastructure and satellite communication systems. In the base station market, for example, high power amplifiers approaching 100 watts are typical. To obtain the most power from these devices, engineers are forced to push them to their limit, often driving them into the nonlinear region of operation. Such nonlinear behavior can be problematic to the amplifier and is typically a contributing factor in wasted frequency spectrum in communication applications. Accurately characterizing and understanding this behavior is critical to enabling today’s engineer to design and verify efficient high-power devices like amplifiers.
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Semiconductor Obsolescence Leads to Gray Market Practices

technology continues to advance, there are an ever-increasing number of semiconductors that are declared EOL (End Of Life) by the original manufacturers. For industries that require extended product support, there is a never-ending need for obsolete or discontinued semiconductors, which has led some companies toward the use of the semiconductor gray market, which has many inherent risks.
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Online Design Support and Evaluation Powered by Remote Simulation

Transim's Design Center is a web-based application that accelerates the design-in complex products into your customers' target applications. Design Centers are already used throughout the analog-mixed signal and power management market place. New areas with pilot implementations or under development are motor drive systems, digital control using microprocessors and RF&MW
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The Design Challenges of RF SIPs and Multi Chip Modules

RF SiP and MCMs integrate CMOS integrated circuits (ICs) for digital circuits and GaAs or SiGe devices for RF and microwave circuits with soft-board laminates and LTCC packages. Software used to design these complex circuits must seamlessly bring together synthesis, simulation, and verification solutions via a single interface ensure optimum component design and placement in each technology.
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Time Domain Oscillator Stability Measurement: Allan Variance

This application note gives a short summary on the Allan variance as a measure of frequency stability and an example on how to calculate it, with measurement results from R&S spectrum analyzers. A software program to sample data from R&S spectrum analyzers and calculate the Allan variance is available.
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300 Watt Class E Amplifier Using MRF151A

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