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Industry News

Mature IP-PBX Technology Fuels More IP-centric Deployments

The enterprise IP-PBX market has moved well beyond the days of protracted testing in enterprise IT labs, and into substantial numbers of user deployments. While businesses are still not likely to upgrade their legacy systems to IP-based systems, nearly all new developments have some degree of IP components. More...
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RFID Integration Services Revenue to Surpass that of RFID Hardware by 2007

As supply-chain-based RFID tags, readers, software and electronic product code (EPC) guidelines rapidly adapt to meet large retailer mandates, tying together the increasingly complex solutions becomes a larger challenge. Larger hardware and software spends require heavy reader, software and system integration service investments. To date, integration has been a...
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The Book End

Software Defined Radio Architectures, Systems and Functions M. Dillinger, K. Madani and N. Alonistioti, Eds. John Wiley & Sons Inc. 456 pages; $155, £85 ISBN: 0-470-85164-3 For a software defined radio (SDR) system to be useful as an adaptable future-proof solution and to cover both existing and emerging standards,...
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Leadless, Multi-band, High Performance GaAs HBT Driver Amplifiers for Cellular Base Station Infrastructure

As cellular system manufacturers begin to roll-out advanced transceiver and multi-channel power amplifier (MCPA) designs destined for the emerging 2.5G and 3G markets, a new series of robust driver power amplifiers is introduced offering users a lower cost, high performance platform approach to base station infrastructure amplification needs. The...
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A Fast Responding 60 dB Log Amplifier for Microwave Applications

Modern wireless transmitters generally incorporate circuitry that directly or indirectly measures and regulates transmitted power. There are a number of reasons for this. Cellular standards such as WCDMA, CDMA2000 and GSM/EDGE demand that both base station and handset power be tightly controlled so that spectral leakage into adjacent channels...
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A Compact RFID Reader Platform for UHF and Microwave Applications

A new line of compact RFID readers has been developed for UHF and microwave applications worldwide. WJ’s model SX2000 is the first in a series of compact EPC Class 1 RFID readers whose size and performance are enabling new RFID applications. The SX20xx RFID reader platform — only 3.37"...
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An Interface Providing Web-based Control of Microwave Power Amplifiers

The ubiquitous IEEE 488.2 interface has served the instrumentation industry well for many years, and will probably do so for many more to come. However, in order to offer considerably more customer choice for the mundane yet important task of instrument interfacing and to exploit emergent interface technologies, Milmega...
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A Low Noise Amplifier IC for 400 MHz to 2 GHz Applications

Key considerations when considering low noise amplifiers (LNA) for mobile applications include small dimensions, and low voltage operation and current consumption, allied to excellent electrical performance. Designed to meet these criteria is a new LNA based on the uPC8211TK IC that can be matched with external passive components for...
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A New Large-signal Model for a Pulse-doped GaAs MESFET

Advances in GaAs MESFET technology require accurate large-signal MESFET models to correctly predict the circuit performance of power amplifiers and oscillators utilized in RF applications and communication systems. New devices such as PHEMTs and pulse-doped MESFETs utilize a concentrated carrier region in the active layer. This leads to more...
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Amplifier Design Using a λ/4 High Impedance Bias Line with a Defected Ground Structure (DGS)

In this article, a new -/4 bias line, combined with a dumbbell shaped defected ground structure (DGS), is proposed to suppress harmonics in power amplifiers. The proposed bias line maintains the required high impedance after the DGS is inserted, while ...
Recently, extensive research efforts on photonic band gap (PBG) structures where periodic patterns are etched on the ground plane of microstrip lines have been conducted for microwave circuit applications. 1–4 The applications of PBG for power amplifiers, filters and mixers have been reported. A defected ground structure (DGS), which...
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