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Welcome to our DesignLine network of web communities. On these sites, we provide practical how-to technical information for engineers and engineering managers involved in
Automotive,audio, DSP, DTV, EDA, Industrial Control, Mobile Handset, Power Management, Programmable Logic,RF,Video, and Wireless networking design. Check out the sites and let us know your thoughts.
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Resource Links
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HOW-TO
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FEATURED HOW-TO
802.11n PHY layer--A tutorial
With 802.11n, wireless achieved data rates equal to wireline. This article discusses how that happened and the major aspects of the 802.11n PHY layer.
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Ethernet Design
Deploying Industrial Networks--A Primer
Seldom does one network topology work for all levels, and a mixture of ring, star and daisy-chaining topologies often works best. The key is a base technology, such as Ethernet, that can work with minimal data manipulation between topological sections. A mature, trusted network technology facilitates quick network design, reliable installation, and provides a wealth of support tools.
Get ready to design power for security IP cameras
Power over Ethernet (PoE) is fast becoming the networking vehicle of choice for video surveillance cameras. As the IEEE works to increase the power available to network powered devices, the market is expected to have new momentum to increase this explosive growth. Find out what you need to know for creating power supplies appropriate for your applications.
Making a case for flexible media Ethernet PHYs
Emerging Ethernet media interface standards exist. Silicon vendors and equipment suppliers must now contend with supporting these interface standards while also supporting legacy equipment in their latest generation of products. See why second-generation dual media Ethernet PHYs achieve this level of flexibility and still keep system BOM costs down.
See all Ethernet Design »
IP Networking
HD multi-room video distribution over IP-based home and commercial networks
Challenges using TCP/IP to distribute HD video include Bandwidth, lost packets, synchronization of signal distribution, and backwards / forwards compatibility. How NetStreams overcomes these hurdles to distribute multiple 1080p video streams.
Delivering outstanding video experiences over IP networks
Imagine you run a company that builds cars. You've been building cars for decades, and you've mastered the practice. Then one day, your company's board of directors decides that from now on, you're going to make jet planes instead. Even though you've never attempted anything like this before. This is what traditional wireline service providers around the world are facing right now as they make the transition from basic voice and data services to consumer video.
Tip of the Week: Correcting soft errors can't be an afterthought
To ensure the highest network QoS and compliance with service level agreements, the ternary content-addressable memory (TCAM) must use up-to-date error correction code (ECC) techniques. Here they are.
See all IP Networking »
Metro/Edge Networking
Understanding OFDMA, the interface for 4G wireless
Though there is no definition on what separates 3G from 4G systems, there seems to be a consensus forming within the standards bodies with respect to maximum supported data rates. Now, and for good reason, OFDMA is emerging as the air interface of choice to achieve those rates with the necessary spectral efficiency.
InGaP HBT vs CMOS for mobile handset power amplifiers
Bulk CMOS and advanced silicon processes have made huge technical advances but the argument is strong in favor of GaAs to meet the stringent performance needs of the most advanced mobile handsets and wireless networking products.
Defeating turn on overshoot
During the startup process, a common problem is overshooting the output voltage. This is caused by the voltage feedback loop configured as an integrating controller. Learn how to eliminate the turn on overshoot associated with integrated feedback circuits in forward, half-bridge, full-bridge or push-pull converter topologies.
See all Metro/Edge Networking »
Last-Mile/Broadband Access
802.11n PHY layer--A Tutorial--Part III
Part 3: The structures of a MIMO-OFDM transmitter and receiver are analyzed and a data rate table is constructed.
Designing for global STB markets
Common among the needs of STB OEMs & ODMs are those for integrated hardware/software solutions. Virtually all want proven reference designs to minimize hardware design & engineering, and to enable rapid time-to-market (TTM).
802.11n PHY layer--A Tutorial--Part II
With 802.11n, wireless achieved data rates equal to wireline. This article discusses the major aspects of the 802.11n PHY layer.
See all Last-Mile/Broadband Access »
Enterprise Networking
Equivalent Results: A methodology to measure the effects of high-speed compression
Real-world examples demo the benefits of using appropriate compression (lower pin counts, lower power consumption, reduced board area, and lower system costs).
Compression/decompression tradeoffs for data networking and storage
Several design trade-offs to exist when building a high performance lossless data compression engine. Each of these trade-offs can vary the gate area of the end design greatly and have significant impact on the overall efficiency of the compressor (compression ratio).
System Clock Generators: PLL Synthesizer vs. Crystal Oscillator Clock--A comparison
Paul Shockman of On Semiconductor answers the question, "Should the new circuit board design or redesign use several crystal oscillator (XO) modules or a phase locked loop (PLL) synthesizer as its system clock source?" Read on for an in-depth comparison.
See all Enterprise Networking »
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