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ISSUE DATE: FEBRUARY 2004 | |
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February 2004 - In This Issue [Cover Story] Agile ADCs Enable Digital Cellular Receivers Digital receivers for cellular communications systems require the highest performance levels from analog-to-digital converters (ADCs) and their supporting cast of RF components. The signal chain must be sensitive enough to capture low-level signals,... — Dan Terlep [News] Process Improvements Drive Device Advances Semiconductor processes and materials continue to improve, leading the way for steady advancements in discrete-device and integrated-circuit (IC) performance and value. Several decades ago, high-frequency devices were almost exclusively based on... — Jack Browne , et al. [Design Features] Assessing Multicarrier Direct-Conversion Transmitters Direct-conversion transmitters appeal to designers of wireless systems for their simplicity and low cost. Unfortunately, the simple architecture does not allow the filtering of broadband noise, images and spurious components typically executed at... — Eamon Nash [Design Features] Design Finite Impulse Response Digital Filters Finite-impulse-response (FIR) digital filters enable many modern communications systems. Last month, this four-part article series opened with a review of key filter specifications and how tradeoffs impact final performance and examined several... — Ricardo A. Losada [Design Features] Quad Demodulators Arm Direct-Conversion Receivers Base-station receivers for next-generation wireless systems must deliver higher performance at lower cost than their predecessors. The direct-conversion receiver architecture is a good candidate to satisfy these conflicting requirements. Although the... — Vladimir Dvorkin , et al. [Design Features] Plastic Packages Take On High-Power Devices Packaging is critical to achieving maximum performance from RF power transistors. Since RF power transistors are among the most expensive components in a power amplifier (PA), and the PA is the most expensive component in a cellular base station,... — David Boulin , et al. [Design Features] Darlington Gain Blocks Hurdle Reliability Problems Gain blocks are used by the millions in commercial and military applications ranging from cable-television (CATV) systems to test instruments. Typically, these broadband amplifiers are designed with a pair of transistors in a Darlington configuration... — Dr. Dean Barker [Product Technology] Analyzers Test New 3G Wireless Formats Third-generation (3G) cellular technologies are slowly but surely gaining ground on the promise of delivering the high data rates required for Internet access and multimedia at acceptable speeds. To ensure that designers of these systems have the... — Jack Browne [Product Technology] Real-Time Analyzers Capture Complex Signals Capturing time-varying signals is a challenge for most measurement tools. Oscilloscopes, of course, are known for their ability to trigger on a high-speed event and show time-domain information about the captured waveform. But engineers seeking... — Jack Browne [Product Technology] FBAR Filter, Duplexer Isolate PCS Signals Filters, once a challenge for semiconductor manufacturers to fabricate, are now being produced in the millions by high-volume batch processes. The Semico nductor Products Group of Agilent Technologies (Palo Alto, CA), for example, has already shipped... — Jack Browne [Editorial] Logging Advances In Semiconductors Semiconductor suppliers have been active during the last few years, trying to keep pace with existing and emerging standards and trends in wireless electronics. In the history of the microwave industry, there has never been a time when specifiers... — Jack Browne |
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