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APRIL 2006 | |
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April 2006 - In This Issue [Cover Story] Cost-Effective VCOs Replace Power-Hungry YIGs Phase noise is the curse of many a communications system, and one of the key performance parameters that most oscillators strive to minimize. System designers have long recognized the yttrium-iron-garnet (YIG) oscillator for its broadband, low-noise, high-frequency capabilities. But YIG sources are also power hungry and physically large. The mechanical design, with a YIG sphere mounted in the air gap of an electromagnet, is not conducive to integrated-circuit (IC)... — Ulrich L. Rohde , et al. [News] Cables And Connectors Link A Wireless World Transmission-line components are certainly not the flashiest part in a wireless system. Yet they are an essential part of this market's backbone. These components serve a variety of segments ranging from commercial and consumer to military and base stations. In doing so, they take many forms ranging from raw cables and individual connectors to complete cable assemblies. The companies that provide these products are numerous and many of them overlap in the different... — Nancy Friedrich [Design Features] Seeking Higher-Power Solid-State Devices Increasing communications volume has increased the demand for higher-power solid-state devices in both terrestrial base stations and satellite-communications (satcom) systems. The required output power for GaAs field-effect transistors (FETs) has been pushed higher for both base-station and earth-station applications. Some operators simply want to transmit their signals further to extend their services to a wider area, while others want to send more data over the... — Toshiaki Nakamura [Design Features] Digitizer Provides Direct Sampling Of RF Signals High-speed analog-to-digital converters (ADCs) have changed most approaches to receiver front ends. An ADC allows a good portion of the analog signal chain leading from the antenna to be eliminated. Similarly, in an instrumentation system, a high-speed ADC allows signals from a sensor to be quickly digitized with a minimum of analog processing. To demonstrate effective practices in directly digitizing RF signals, the RF subsystem for an instrumentation product used in high-energy physics... — Uros Mavric [Design Features] Microstrip Filters Provide High Harmonic Suppression Harmonic filters are invaluable for removing unwanted higher-order harmonic signals from microwave multipliers and mixers in receiver designs, among other applications. Although a variety of filter configurations have been developed to reduce the level of harmonic signals, the authors investigated two varieties of bandpass filter designed for good harmonic suppression. Parallel coupled line sections were employed in both filter approaches, with phase equalization of coupled resonators... — R. Ramasubramanian , et al. [Special Report] Finding A Filter From An Array Of Choices Microwave filters come in a confusingly large range of shapes, sizes, and technologies. From the chiplike devices used in cellular telephones to the metal-housed cavities built to handle kilowatts of power, RF/microwave filters serve many purposes. Just knowing what is available helps when it is time to narrow the list of candidates for a particular application. As with most electronic components, the trend in microwave filters is for miniaturization but... — Jack Browne [Product Technology] LDMOS FETs Power WiMAX Base Stations Powering a WiMAX base station is not a trivial matter. The wireless application occupies the 3.5-GHz band among others, which is too high in frequency for traditional RF transistors and too high in power for most microwave devices. In the 2.5 GHz WiMAX band, power-amplifier (PA) designers have been able to choose from both silicon LDMOS FETs and compound semiconductor devices such as GaAs FETs. But the silicon devices have lacked the power, linearity, and efficiency of... — Jack Browne [Editorial] Live Each Day Like It's Your Last LIFE IS WHAT YOU MAKE OF IT. Many far wiser than this writer have tried to hand down this practical advice. But most of us ignore it, probably because there is always tomorrow, or at least our belief that there will be a tomorrow and yet another chance to get things right. And so most of us muddle on with our lives, until there finally is no tomorrow. Sometimes, we awaken to the notion that we don't live forever, and that "leave-it-until-tomorrow" attitude vanishes like the days... — Jack Browne |
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