Page 51

EETE MAR 2014 A leading reference resource for electronics engineers, E Times Europe’s White Paper library includes over 600 white papers, application notes, technical articles, books and case studies that can be downloaded free of charge. The latest featured papers are available below. Putting FPGAs to Work in Software Radio Systems Handbook FPGAs have become an increasingly important resource for software radio systems. Programmable logic technology now offers significant advantages for implementing software radio functions such as DDCs (Digital Downconverters). For many applications, this implementation shift brings advantages that include higher precision processing, higher channel density, lower power, and lower cost. Recently updated to its 7th edition, this handbook introduces the basics of FPGA technology and its relationship to SDR systems. Real-Time Spectrum Analysis for Troubleshooting 802.11n/ac WLAN Devices 802.11 WLAN devices operate in the license-exempt 2.4 GHz ISM and 5 GHz UNII bands, where they must share spectrum with many other wireless devices that can cause interference. Verifying the performance of WLAN devices in the presence of interfering signals that may be time-varying is an important part of design verification. Troubleshooting performance problems in real-world environments is another challenge, and being able to capture interfering signals that may be present and impacting performance, even if they are transient and very short in duration, can provide important insight. Real-time spectrum analysis can help address these test challenges. NSR Noise Suppressors: Wirewound Resistors Noise suppressors are wirewound resistors which are specially designed to be implemented in automotive ignition systems to reduce radio frequency interference (RFI) caused by electrical discharges. The resistors can be placed in the rotor of the distributor, the spark plug leads, as well as in the spark plug caps itself. This application note will explore key specifications of the devices. Radar Waveforms for A&D and Automotive Radar This white paper provides a detailed view on radar waveforms for Aerospace and Defense and commercial radar systems. Waveforms such as pulse and pulse- Doppler signal, continuous wave and frequency shift keying waveforms are described. It also shows continuous waveform trends designed for specific needs and application differences of continuous wave radar compared to pulse radar systems. Hall-Effect Sensor ICs for Motor Control Motor control circuits in appliances, including refrigerators, washing machines, and air conditioners, need to operate more efficiently, reliably, and safely, while meeting cost requirements. With energy efficiency becoming a greater concern, appliance manufacturers should consider Hall-effect current sensor ICs for motor control. Understanding WLAN offload in cellular networks The coming challenge for Wi-Fi™ offload is to provide a converged network solution for a seamless, transparent and better user experience. The user will not have to interact with its smartphone or mobile device in any way to switch from 3G/LTE to Wi-Fi™. The data stream will even be able to use both connections at the same time depending on QoS requirements. This short guide explores the technical aspects of Wi-Fi™ offload architecture and its related capabilities. It is presenting the different types of possible integration into existing mobile networks to provide a viable and efficient way to offload subscriber traffic. It concludes with an overview on testing methods. Electronic Engineering Times Europe March 2014 51

To see the actual publication please follow the link above