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AUGUST 2003 | |
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August 2003 - In This Issue [Cover Story] MEMS Sources Offer Alternative To Quartz Frequency generation has long relied on the quartz-crystal resonator as a timekeeper. Because of the required wavelengths (for typical frequencies of 10 and 20 MHz), however, quartz resonators cannot be miniaturized beyond about 1 or 2 mm on a side.... — Jack Browne [News] UWB Proponents Seek Standardization Wireless "standards keepers" have kept a strong collective eye on the emerging technology known as ultrawideband (UWB) communications, perhaps as much for fear that it could interfere with existing wireless formats as much as for fear that it could... — Jack Browne [Design Features] Configure An Optimal RF/Microwave Switch System Switching systems are vital parts of automated-test-equipment (ATE) systems for evaluating communications components. Since a typical test system must route a wide range of signals, including RF, microwave, and DC bias signals, to a wide range of... — Jerry A. Janesch [Design Features] Mounting Technique Aids MMIC Performance Performance levels of high-frequency monolithic-microwave integrated circuits (MMICs) are often compromised within packages and circuits. Fortunately, a novel technique for mounting MMICs in microstrip circuits helps optimize device performance even... — Larry Silverman [Design Features] Simulation Approach Aids RF Design Debugging Design time can be dramatically shaved with the help of a new simulation technique that enables RF designers to perform root-cause analysis of RF architectures. The approach provides complete spectrum identification and origination information for... — Rulon VanDyke [Product Technology] Testers Mimic Propagation Losses To 13.25 GHz Signal losses and fading in communication links result from atmospheric losses, reflections from terrain, and multipath distortion. To recreate the effects of those signal losses, ARRA, Inc. (Bay Shore, NY) offers their model AR39XX and AR40XX series... — Jack Browne [Product Technology] Multiloop Synthesizer Tunes 1 To 2 GHz Frequency-synthesizer performance is usually a compromise. Single-loop phase-locked-loop (PLL) designs can achieve fast switching speeds, but lack the filtering capability to dramatically lower phase noise and spurious content. Multiloop synthesizers... — Jack Browne [Product Technology] Free Software Is Powerful Simulator Simulation can be expensive, especially when adding essential function modules to a suite of programs. But for those hoping to perform some basic linear circuit and system simulations, cost need not be an issue, especially when considering Ansoft... — David Vye [Editorial] UWB Must Survive The Format Wars Wireless technologies tend to spring up quickly, but often do not take root until the adoption of a standard. For one thing, integrated-circuit (IC) suppliers are reluctant to commit to a proposed technology if there is some uncertainty about how long... — Jack Browne |
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