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RF Power Amplifiers Come From Common Stuff Most modern RF power amplifiers are built from legacy analog circuits. Typically, such circuits are produced in multi-component modules and in costly, low-volume semiconductor processes like Gallium Arsenide (GaAs). Yet ParkerVision, Inc. recently extended its Direct2Data digital RF transceiver technology to overcome a significant hurdle. It can now produce ultra-efficient, low-cost RF power amplifiers in common silicon semiconductors.... — Lisa Maliniak March 2005 [Cover Story] 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 [Cover Story] 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 March 2005 [Design Application] LCDs Enjoy Flexible Power-Up Sequencing For many systems, liquid-crystal displays (LCDs) are a large part of the bill of materials (BOM). In some cases, more than 80% of the entire system cost is that of the LCD panel (e.g., high-definition televisions or HDTVs). LCDs also are a major factor in a consumer's perceived quality perspective. If the LCD begins to fail, the end customer will associate the system and its manufacturer with poor quality. Clearly, safeguarding the LCD component is a critical aspect of these system... — Bart Borosky , et al. January 2005 [Column] Technologies Look To Bring Backup Power Out Of Flux Across the wireless industry, a confluence of factors has made the upgrade of backup power a top priority. Networks are straining to handle the burgeoning number of products and the skyrocketing demand for them. At the same time, networks must provide the reliability that consumers expect. In 2003, the blackouts on the East Coast of the U.S. revealed the extent of this pressure. Not surprisingly, carriers are striving to optimize every aspect of their networks including backup power. The... — Eoin Connolly January 2005 [New Products] High-Gain Amplifier Spans 3.3 To 3.8 GHz The race to WiMAX is on and it can be seen in many parts of the industry. For instance, Hittite Microwave Corp. just came out with a high-efficiency GaAs InGaP HBT MMIC power amplifier. Although the HMC409LP4 is suited for 802.16d/e WiMAX applications, the amplifier also is useful in other broadband fixed wireless applications in that frequency range. It operates between 3.3 and 3.8 GHz. Using a minimum of external components, the amplifier provides 31 dB of gain and +32.5 dBm of... — Lisa Maliniak November 2004 [New Products] Interconnect Manages Power And Data Flow As systems-on-a-chip (SoCs) bring more functionality onto the chip itself, data flow becomes a daunting issue. To confront this design problem, Sonics, Inc. has come out with the SonicsMX solution. The goal of SonicsMX is to enable the design of... — Nancy Friedrich July/August 2004 [Design Application] Will RF Detectors Measure Up To 3G? Many systems need to measure radio frequency (RF) power. Some examples include communications transceivers, instrumentation, industrial controls, and radar. Sometimes, these RF-power measurements are required to assure compliance with... — Rick Cory , et al. July/August 2004 [Design Application] Cell Phones Demand Better Battery Life Just a few short years ago, the expectations of cell-phone users centered around one capability: being able to reliably conduct voice calls while they were away from a wired telephone set. Since then, impressive technological advances have been... — Walter Croce July/August 2004 [New Products] Wide-Bandwidth Amplifier Heightens Dynamic Range The design and manufacturing of radio systems can be simplified by selecting a device that supports multiple functions. Mimix Broadband, for example, recently announced an amplifier with low noise bias. This feature makes it suitable as a low-noise... — Staff April 2004 [Design Application] Memory Motivates Cell-Phone Growth As cellular phones incorporate the multi-function capabilities that enable web-access and digital-camera functionality, their supporting memory subsystems grow increasingly complex. For engineers in today's cell-phone market, one of the main design... — Masashi Yokotsuka March 2004 [Special Report] Looking For Ethernet Power? Find The Outlet, Nevermore Designers and customers alike are just beginning to appreciate the far-reaching effects of Power-over-Ethernet (PoE) technology. The products that meet the IEEE 802.3af PoE standard may revolutionize the installation of any device that's based on the... — John Blyler February 2004 [On The Wireless Front] On The Wireless Front Milpitas, California Linear Technology now offers the LTC1407A and LTC1407 analog-to-digital converters (ADCs). These 14-b and 12-b, 3-MSample/s ADCs have two simultaneous sampling inputs. Plus, the... — Cheryl Ajluni November/December 2003 [Special Section] Human Power Charges Handsets Have you ever seen those emergency-radio products that receive power from a hand-crank mechanism? Well, now the same type of mechanism is available for mobile phones. The FreeCharge hails from a company called FreePlay. Essentially, it converts... — Staff November/December 2003 [On The Wireless Front] On The Wireless Front New Cumberland, Pennsylvania A new series of low-phase-noise, oven-controlled crystal oscillators is available from Techtrol Cyclonetics, Inc. These high-performance SC crystal oscillators are offered in... — Cheryl Ajluni October 2003 [News] PA Module Urges Smart Phones To Diversify Modern cellular phones perform a varied array of tasks. They can connect to the Internet, take and send photos via e-mail, and keep their users organized and on time. Meanwhile, innovation in personal communications and handheld computing is forging... — Cheryl Ajluni October 2003 [Special Section] PA Offers Possibilities To 2.4-GHz WLAN Products Manufacturers of WLAN routers and access points are hustling to develop competitive equipment in a demanding market. To succeed, they first need high-performance, low-cost, power-amplifier (PA) modules. Thanks to its excellent linearity and... — Staff October 2003 [News] On The Wireless Front Santa Clara, California California Eastern Laboratories (CEL) recently announced the availability of an uncooled, 1310-nm, directly modulated laser-diode module. Hailing from NEC, it is designed for the 10-G... — Staff September 2003 [Design Application] Batteries Bear The Digital Load's Burden As the world moves from analog to digital communications devices, new demands are being placed on the battery. While analog transceivers draw a steady current, the digital radio loads the battery with short, heavy current spikes. For example, the... — Isidor Buchmann September 2003 [News] On The Wireless Front Syracuse, New York Anaren, Inc. recently announced that its Breakthrough 2003 launch represents a major improvement in balun transformers. This launch takes the form of a minuscule, surface-mount Xinger-brand... — Staff  prev. page
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