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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...
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...
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,...
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...
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...
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"...
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...
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...
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...
A considerable research effort has been invested to optimize the efficiency of high frequency power amplifiers. The work has been focused on output load network design for high frequency active devices. However, the attention received by the driving waveforms and input circuits has been quite low compared to that...
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