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ISSUE DATE: JUNE 2003 | |
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June 2003 - In This Issue [Cover Story] LTCC Leads To Tiny 90-deg. Splitter Low-temperature-cofired-ceramic (LTCC) technology makes possible multilayer circuits with active and passive components occupying a fraction of the volume of conventional planar high-frequency circuits. Mini-Circuits' engineers applied their Blue... — Mini-Circuits' Engineering Dept. [News] Crosstalk: An Interview with Sirenza's Robert Van Buskirk and Chuck Bland Sirenza Microdevices (Sunnyvale, CA) acquired the assets of the Vari-L Co. (Denver, CO) on May 5, bringing together companies with different product lines but similar cultures. Integration of the two companies offers traditional manufacturing... — Barry Manz [Design Features] Designing Antennas For UWB Systems Ultrawideband (UWB) technology offers several advantages over conventional communications methods. For example, UWB systems feature information bandwidths of 1 GHz and more while being able to share spectrum with other applications without causing... — Christopher R. Anderson , et al. [Design Features] Tracking WCDMA Transmitter Theory Third-generation (3G) wireless communications systems are designed to improve upon the performance and services available from their first- and second-generation (1G and 2G) predecessors. The goal of 3G systems is true seamless global mobile... — Paul Kimuli [Design Features] Optimize Benefits Of Subharmonic Mixers Subharmonic mixers are attractive for millimeter-wave systems, at frequencies where signal generation is expensive. Such mixers are often used in applications above 30 GHz, such as digital microwave radios, and even called upon in support of... — Tony Donisi [Product Technology] EM Software Boosts Productivity Electromagnetic (EM) circuit simulation has grown steady in importance to RF/microwave designers. Long an accurate method of predicting high-frequency behavior, early EM simulators were nonetheless difficult to use because of limited design... — Brad Brim [Product Technology] Single HBT Amp Drives All WLAN Bands Wireless local-area networks (WLANs) are proliferating almost as fast as the number of WLAN standards. At present, several 5-GHz bands are earmarked for high-data-rate WLANs within the UNII band from 5.15 to 5.85 GHz, including IEEE 802.11a and... — Jack Browne [Product Technology] EMC Antenna Spans 26 MHz To 5 GHz Antenna technology does not often benefit from dramatic new developments compared to, for example, semiconductor technology. But the designers at Amplifier Research (Souderton, PA) have managed to significantly advance wideband antenna technology... — Jack Browne [Product Technology] Linearizers Enhance PA Performance Power amplifiers (PAs) represent one of the more critical components in wireless devices and systems. Many techniques have attempted to improve PA linearity and efficiency, including the use of analog feedforward processing and digital signal... — Jack Browne [Product Technology] ADC Driver Offers Digitally Controlled Gain Digitally controlled gain in the new MAX2055 variable-gain amplifier (VGA) from Maxim Integrated Products (Sunnyvale, CA) allows the device to quickly achieve optimum signal levels for analog-to-digital converters (ADCs). Designed for intermediate... — Jack Browne [Editorial] Assess Economics At Trade Shows Predicting future economic conditions is a task that often seems a curious blend of economic theory, statistical analysis, and old-fashioned voodoo. One of the most commonly asked questions during plant visits or at trade shows during the last year... — Jack Browne |
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