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JULY 2005 | |
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July 2005 - In This Issue [Cover Story] DDS IC Initiates Synchronized Signals Direct-digital-synthesizer (DDS) technology allows a single source to precisely control signal frequency and phase with high-speed switching. But integrate multiple DDS devices on a single integrated circuit, and the capability expands to synchronized signal generation for a wide range of commercial and military applications. The new AD9958 dual-DDS and AD9959 quad-DDS devices offer such capability, with 32-b frequency tuning resolution, 10-b amplitude tuning resolution, and speeds to 500... — Jon Baird , et al. [News] Measuring The Costs Of Broadband Services Emerging technologies are not always enduring technologies. Consumers, for example, may one day fondly recall 5.25-in. floppy computer disks, Beta and VHS videotapes, minidisk recorders, analog televisions, and vacuum-tube radios as representative of technologies past. At microwave frequencies, the importance of vacuum tubes is quickly waning, while increased use of monolithic circuits is quickly eroding the role of discrete transistors, diodes, and hybrid circuits. Of course, with every... — Jack Browne [News] High-Power Transistors Focus On Emerging Applications Transistors may seem like simple devices. The reality, however, is that an impressive lineage of research and development stands behind each transistor. Often, the companies that make these devices have spent years on their technologies and approaches. They come out the other end as specialists in their transistor domain—be it silicon-carbide (SiC), LDMOS, or one of the many other technical variations. For instance, the MOSFET expertise of Integra Technologies, Inc. (El Segundo, CA) has... — Nancy Friedrich [Design Features] Capacitive Loading Shrinks Mobile PIFAs Shrinking cellular telephones call for smaller antennas. One of the more effective antenna designs for mobile applications is the planar inverted-F antenna (PIFA). Fortunately, this proven design can be shrunk without appreciable loss in electrical performance through the use of simple capacitive top loading. Several methods have been applied for antenna size reduction, all at the expense of lower antenna gain and bandwidth.1 This is due to the fact that the antenna is... — Kaj B. Jakobsen , et al. [Design Features] Microstrip Antennas Guide Satellite Data Transmissions Satellite communications, such as the link provided by the Quicksat spacecraft for amateur radio operators at ultra-high frequency (UHF) and S-band, rely on high-performance antenna designs. Fortunately, a microstrip antenna design reported at S-band for remote sensing satellites can be adapted to provide the circularly polarized conical patterns required for effective data transmissions between the satellite and earth at both UHF and S-band frequencies. For medium-altitude,... — Dr. A. Kumar [Editorial] Innovative Solutions Emerge At MTT-S Major trade shows often serve as "launching pads" for new products or technologies. Many microwave firms, for example, plan product introductions around the week of the Microwave Theory & Techniques Symposium, held last month in the Long Beach Convention Center (Long Beach, CA). Although show activity is often a sign of the economic times—fairly slow at the moment—the flurry of introductions at the recent MTT-S belies this trend. One of the technologies of interest... — Jack Browne |
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