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Industry News

IEEE Begins Work on WRAN Standard

Over-the-air broadcast TV channels are separated by unused frequencies. This “white space” in the broadcast spectrum varies with the channels present in a locale and creates opportunities for other applications. As a step in putting these unused channels to practical use, the IEEE has started work on a standard...
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The Book End

Ultra-Wideband Radio Technology Kasimierz Siwiak and Debra McKeown John Wiley & Sons Ltd. 264 pages; $95 ISBN: 0-470-85931-8 This book is designed to give a basic overview of the subject of ultra-wideband (UWB) technology. It grounds the reader with a brief history, offers an understanding of the current regulations...
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Multi-layer Thin Film Interconnects

UltraSource is a high quality supplier of precision thin film circuit fabrication including custom resistor networks and attenuators, metallized substrates and MEMS fabrication with a focus on using its thin film manufacturing capabilities to supply custom products from prototypes to high volume production. The products range in application from...
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Base Station Test Set

Comprehensive on-site testing of base stations using real-world scenarios, both at initial installation and then during ongoing maintenance, plays a vital role in preventing and solving performance problems before they impact subscribers. Thorough independent testing gives operators greater confidence in the quality of the deployed network. Poorly performing base...
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High Voltage, Low Cost FETs for HPA MMIC Applications

M/A-COM is a longtime supplier to the military, Navy, Army and Air Force of GaAs MMICs, employed in active phased array radars. To date, the company’s GaAs process of choice has been its Multifunction Self-aligned Gate (MSAG™) process. MSAG features selective ion implantation with noncontacting stepper lithography to provide...
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A MEMS-based Amplified Switch Filter Bank

For more than 15 years, Spectrum SEI Microwave has developed PIN diode and MMIC-based switched filter banks. Recent advancements have made micro-electromechanical systems (MEMS)-based RF switches advantageous for particular applications. The model 310-020022-001 is SEI’s first MEMS-based switched filter bank. Switching The company was presented with a need for...
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Accurate Power Detection of a CDMA Multi-carrier Power Amplifier Using a Logarithmic Amplifier

The accurate detection of the power output of a multi-carrier CDMA power amplifier enables the enhancement of power efficiency and harmonic suppression. Even though CDMA carriers with equal total power are applied, the experimental results, using a log...
In a typical multi-carrier power amplifier (MCPA) application, it is well known that good amplitude matching and good phase matching are required for greater reduction of intermodulation distortion (IMD) or for better harmonic rejection within the CDMA spectral mask. To solve the mismatching problem, it is desirable to accurately...
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High Performance Wideband MSAG Gain Block/Driver Amplifier MMICs Using MLP Technology

The multi-level plating (MLP) process has been used to develop a family of wideband, low noise, generic gain block and driver amplifier MMICs operating up to 20 GHz. MLP implementation provides significant performance improvements over standard MMIC pr...
Wideband, low noise, generic gain block and driver amplifier MMICs have been developed using many different device technologies including MESFET, HBT and PHEMT. Among these, PHEMT-based MMIC technologies have achieved superior performance due to inherent device high frequency operation capability. In order to achieve superior performance similar to PHEMT...
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Remote Sensing Through Satellites: A Tutorial Review

Remote sensing is a multi-disciplinary activity that deals with the inventory, monitoring and assessment of natural resources, following the analysis of data obtained through observations from a remote platform. This technology, under development since the early 1960s, has shown great promise in improving the information collection regarding the world’s...
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