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Fast Data Converters Advance Wireless Systems Data converters can be thought of as the central cores of wireless-infrastructure systems. Complex signals must be digitized upon reception and converted to analog form for transmission. To meet the needs of present and future-generation wireless-infrastructure systems, analog-to-digital converters (ADCs) and digital-to-analog converters (DACs) must therefore perform at RF rates and with outstanding linearity. The AD9444 ADC and AD9779... — Jack Browne March 2005 RF RMS Power Detector Measures Two Signals Simultaneously To support the data converters in wireless-infrastructure equipment, Analog Devices has introduced a dual-channel RF root-mean-square (RMS) power detector. This power detector measures transmit and receiver signal levels to 2.7 GHz. Known as the AD8364, the device can measure two complex input signals simultaneously. This integrated circuit is ideal for measuring the power levels of complex signals with constantly varying peak-to-average power levels, as in cdma2000, W-CDMA,... — Jack Browne February 2005 Structured ASICs Plan To Outpace FPGAs System architects generally turn to application-specific integrated circuits (ASICs) when designing ICs for high-volume, high-performance applications. Yet the development of such ASICs calls for expensive design tools. It also invites high development costs and extended time to market. To conquer these problems, Altera recently introduced its third-generation structured ASIC: the 90-nm HardCopy II family. The HardCopy II structured ASICs were created as an alternative to... — Nancy Friedrich January 2005 Tools Aid Compliance With RF Safety Program Since the construction of the earliest television and radio antenna towers, health concerns over "overexposure" to non-ionizing radiation have surrounded wireless transmissions. With the growth of wireless communications services, these concerns have only increased. The Federal Communications Commission (FCC) has therefore adopted guidelines that govern the exposure to RF emissions for those operating FCC-licensed wireless transmitters. Compliance by FCC licensees isn't just recommended. It... — Robert E. Johnson December 2004 Amplifiers Drive Broad Applications General-purpose amplifiers (GPAs) can be thought of as the "RF glue" in wireless systems. Although they're simple in design, these amplifiers must boost RF signals to acceptable levels. They also must overcome the losses that are accrued by a... — Jack Browne November 2004 Higher-Bandwidth DSP Covers Asia's Telecom Market Few places have experienced the explosive wireless-telecommunication-network growth that has been seen in Asia. The demand for wireless devices and, more importantly, the networks that support them has been especially great in China. For instance,... — John Blyler September 2004 Software Works So You Don't Have To Traditionally, the cover of Wireless Systems Design has featured a product, component, or design tool that in some way stands out from the rest. The cover product may flaunt lower power, lower cost, or higher performance. Or, it may have been... — Cheryl Ajluni July/August 2004 Software Drives Ultra Wideband Home Ultra Wideband (UWB) is used to transmit digital data over a wide spectrum of frequency bands with very low power. This wireless technology can carry huge amounts of data over a short distance. Thankfully, UWB is not prone to the signal... — Cheryl Ajluni June 2004 Chip Set Widens ZigBee's Web Right now, a multitude of wireless-connectivity standards exists. Each of these standards promises to fill a unique void in the path toward total wireless-network connectivity. Many experts agree that getting to this connected reality is possible. Yet... — Cheryl Ajluni May 2004 WLAN Testing Gets Down To A Science When engineers think of wireless-local-area-network (WLAN) test equipment, images of bulky spectrum analyzers often come to mind. They may even picture oddly named "sniffer" programs that are used in conjunction with these analyzers. In addition,... — John Blyler April 2004 ADC Takes On Cellular Base Stations Cellular base stations currently present many challenges. They remain complex in design and operation while carrying a significant price tag. Weighing heavily on this cost and complexity are the individual cellular base-station components. Among these... — Cheryl Ajluni March 2004 DUC Eclipses Competitive Offerings The cellular-infrastructure market continues to face its own set of challenges. Consider, for example, that the single most expensive component on a base station is the multi-carrier power amplifier (MCPA). Depending on the MCPA architecture and... — Cheryl Ajluni February 2004 Transceivers Make Wireless Easy The desire for wireless embedded communications is quickly gaining ground. After all, wireless technology gives users unrestricted access to different locations. At the same time, it eliminates the need for costly wiring. Consider, for example, a... — Cheryl Ajluni November/December 2003 Radio-On-A-Chip Unwires Electronics Many of today's engineers and designers hope to make the switch from wired electronics to their wireless counterparts. Factoring in installation, this migration typically provides a great deal of cost savings. But the adoption of wireless technology... — Cheryl Ajluni October 2003 Chip Set Withstands WLAN's Future Blows The furious pace of WLAN announcements is almost drowning engineers. Because they're being inundated with so much information, it's hard for engineers to separate marketing hype from technical fact. Yet certain truths do exist. For example, the WLAN... — Cheryl Ajluni September 2003 Location-Based Services Are Positioned For Growth To many people, "location-based services" (LBS) is just one long buzzword. The average American consumer is probably familiar with some of the capabilities of the FCC-mandated e-911 initiative. But he or she has had little real exposure to LBS... — John Blyler July/August 2003 Mobile Technology Goes To Medical School Medical institutions strive to provide each student with the best tools and training possible. These physicians in training are probably most commonly described as "mobile." To observe doctors, patients, and procedures, they move between classrooms,... — John Keane , et al. June 2003 PLLs Plot An Adjustable Course Phase-locked loops (PLLs) are commonplace in applications like cellular phones, wireless transceivers, and Global Positioning Systems. Despite their familiarity to systems engineers, however, PLLs come with their own unique set of challenges. For... — Cheryl Ajluni May 2003 Design Suite Bridges System/Circuit Gap Over the course of the past 10 years, wireless-communications-system design has become increasingly difficult. The old way of doing it required engineers to deal with measurements based on things like S-parameters and third-order intercepts.... — Cheryl Ajluni April 2003 Receiver Drives Base Stations To EDGE The EDGE standard is quickly becoming a key linchpin in the migration to 3G. Many factors support this statement. For starters, today's operators want and need to drive up revenue. With the high-speed data rates that it enables, EDGE is seen as one... — Cheryl Ajluni  prev. page
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