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Industry News

The Commercial Market

The Commercial Market Small Business IT Expenditures 2002-2006 In-Stat/MDR estimates that the small business market (firms with 5 to 99 employees), in aggregate, spent more than $154 B on information technology in 2002, up almost four percent from 2001 estimates. By 2006, In-Stat/MDR estimates that small businesses will spend...
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The Book End

Modern Microwave Transistors - Theory, Design and Performance Frank Schwierz and Juin J. Liou Wiley Interscience 486 pages; $89.95 ISBN: 0-471-41778-5 Microwave transistors are the backbone of modern microwave systems. In recent years they have undergone an impressive evolution, where continuous research efforts have made transistors faster and more...
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Conformal Subsections for Accurate EM Analysis

The fast fourier transform (FFT) approach to the method of moments (MoM) is well known for providing high accuracy, high dynamic range and robust electromagnetic (EM) analysis of planar circuits. The FFT consistently calculates the coupling between subsections to full numerical precision; no error is introduced by complex multi-dimensional...
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Two New High Performance Resonator Materials

In the telecoms and other RF component markets, today's climate means that there can no longer be a trade-off between cost and performance - the designer needs to achieve both. Temex has recognized this fact and addressed it through the evolution of two new generations of materials on which...
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Breakthrough Power Amplifier Module for Handset Applications

This is the best time to be a consumer of electronic products. Wireless mobile devices, especially cellular handsets, have more features, are smaller and have better battery life than ever before. The cellular handset manufacturing industry is continuously challenged to deliver high performance, cost-effective, small form function products to...
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Design of a MESFET Frequency Multiplier - Theory and Simulation

The design of nonlinear circuits is usually viewed as a challenge, mainly because of the difficulty in determining the accurate model that describes the device behavior over a wide range of conditions, including varying frequency and power level. The m...
The basic principle of operation of a MESFET multiplier is that the device is biased for a particular conduction angle, based on the harmonic frequency to be generated. A generalized circuit schematic of a MESFET frequency multiplier is shown in Figure 1 . It can be seen that the...
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Design of a TRM Calibration Kit for the ZMA Coaxial Interface Using Ansoft HFSS

When new coaxial interfaces become available, it is important to validate their performance. The best way to do this is by using a calibration kit that eliminates the effects of adapters in the measurement. This article discusses the design and impleme...
One of the greatest challenges in characterizing new coaxial interfaces is to determine an accurate test configuration. When precision airlines are not available it is very difficult to obtain a true measurement of the device under test. It becomes necessary to design and implement calibration standards to eliminate the...
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Multicriteria VCO Design

High frequency, voltage-controlled oscillators (VCO) are important components of modern RF systems. They are characterized by a set of parameters, which must be analyzed and optimized (for example, phase noise, frequency tuning range, tuning linearity and output power). Many studies are dedicated to the research of VCO characteristics. 1-8...
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RF Test Fixture Basics

When the RF test system and the device-under-test (DUT) both have coaxial connectors, hooking them together to make a measurement is easy. However, as radio-frequency integrated circuits (RFIC) have shrunk in size, traditional coaxial connectors are no longer useful. With the multitude of RF component sizes and shapes found...
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