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ISSUE DATE: JANUARY 2004 | |
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January 2004 - In This Issue [Cover Story] Load-Pull Tuners Are Frequency Selective Power-amplifier (PA) designers must constantly strive for improved linearity and efficiency to meet the needs of current and emerging communications standards. High-data-rate digital modulation formats require nearly distortion-free performance from... — Roman Meierer , et al. [News] Wireless Show Promises Practical Design Solutions Wireless device, circuit, and system design engineers must face time-to-market pressure every day. Challenged also by difficult economic times, designers rely on the latest information on wireless design techniques, test equipment, and software... — Jack Browne [News] Measurement Group Meets On Test/Modeling Issues Simulation and measurement results should agree closely under ideal conditions. Although such conditions are often not met, the most recent meeting of the ARMMS RF and Microwave Society Meeting focused on coordinating design efforts with... — Jack Browne [Design Features] Check Nonlinear Distortion With A Vector Signal Analyzer Nonlinear distortion is a critical performance parameter for power amplifiers in mobile radio networks. Excessive distortion can degrade bit-error-rate (BER) performance, resulting in poor network voice and data transmission. Fortunately, the vector... — Hagen Eckert [Design Features] Design Finite Impulse Response Digital Filters Digital filters have enabled much of modern communications and the measurements that support them. While most high-frequency design engineers may be familiar with the use of the MATLAB mathematical modeling tool from The MathWorks (Natick, MA) for... — Ricardo A. Losada [Design Features] Evaluate The Performance Of Amplifying Predistorters Predistortion circuits can improve the linearity of power amplifiers (PAs) and other devices used in communications systems. An amplifying predistorter, for example, employs the nonlinear distortion components of a preamplifier to correct the... — Ralph Inducta , et al. [Product Technology] Top Products Of 2003 Difficult times notwithstanding, 2003 marked the arrival of many innovative products in hardware, software, and test equipment. Selected by the editors of Microwaves & RF for their technical innovation and practical benefits to designers... — Jack Browne [Product Technology] DSOs Track Elusive High-Speed Waveforms Oscilloscopes are not often considered the main measurement tools of the RF/microwave engineer. However, with the increasing use of complex modulation formats in commercial communications, and "exotic" signal formats in military systems, the digital... — Jack Browne [Product Technology] Synthesizers Switch To 40 GHz In Nanoseconds Nanosecond synthesizer switching speeds are critical in many military applications, including radar, electronic-warfare (EW), and surveillance systems. The UFS Series of frequency synthesizers from Elcom Technologies (Rockleigh, NJ) bring this kind... — Jack Browne [Editorial] Facing The Next Test Challenge Test-equipment developers are to be applauded for their knack of anticipating the industry's high-frequency measurement needs. In spite of the plethora of wireless-communications formats and standards, including the various flavors of cellular... — Jack Browne |
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