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Practical Considerations for Wireless Sensor Networks and Mesh Networking

September 22, 2009 7:25 am | by Robert Jackson, Wireless and Energy Product Manager, National Instruments | Comments

In Crossing the Chasm, Geoffrey A. Moore introduced the Technology Adoption Lifecycle.  This curve highlights a chasm that exists between visionaries who are early adopters of technology and pragmatists who wait for proven technologies and products.  For technologies to “cross the chasm” one key component are products with defined product specifications and system deployment guidelines.

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Data Acquisition Rules of the Road: Selecting High-Speed Differential ADC Drivers Part 2

September 17, 2009 7:38 am | by John Ardizzoni and Jonathan Pearson, Analog Devices | Comments

The input signal is v1; the first five harmonic-distortion products are v2 through v6; and the ADC electronic noise is vn. The reciprocal of THD + Noise, the signal-to-noise-and-distortion ratio, or SINAD, is usually expressed in dB. If SINAD is substituted for the signal-to-quantizing-noise ratio, we can define an effective number of bits that a converter would have if its signal-to-quantizing-noise ratio were the same as its SINAD.

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Data Acquisition Rules of the Road: Selecting High-Speed Differential ADC Drivers

September 15, 2009 6:14 am | by John Ardizzoni and Jonathan Pearson, Analog Devices | Comments

As applications engineers, we are constantly bombarded with a variety of questions about driving high-speed analog-to-digital converters (ADCs) with differential inputs. Indeed, selecting the right ADC driver and configuration can be challenging. To make the design of robust ADC circuits somewhat easier, we’ve compiled a set of common “road hazards” and solutions.

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The Wireless Power Consortium Releases the 0.95 Specification

September 11, 2009 6:05 am | by Camille Tang, Co-Chair, Wireless Power Consortium | Comments

Wireless power interoperability marked an important milestone with the 31 July 2009 release of 0.95 specifications of Qi, the Wireless Power Consortium’s “WPC” international standard in wireless power. This interoperability means that all Qi power receivers can be powered and charged with all Qi transmitters.

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Brushless DC Motors Roll On

September 10, 2009 12:36 pm | by Jon Titus, Senior Technical Editor | Comments

You can find brushless-DC motors in appliances, medical instruments, and industrial equipment because they offer advantages over their brushed-DC-motor siblings. But before you can use a brushless-DC (BLDC) motor you need to understand how it works.

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Design Talk - Industrial and Harsh Environments

September 10, 2009 10:30 am | Comments

Editor's note No matter how good the tech, if it addresses an industrial or other demanding environment application, it better be able to deal with its surroundings without operational compromise.

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Serial Flash Memory: The Solution to a Shrinking Problem

September 10, 2009 10:04 am | by Jeffrey Bader, Director, Embedded Business Group, Numonyx | Comments

As consumers clamor for smaller, sleeker and cheaper products, the pressure for embedded designers to find space and cost effective flash memory is higher than ever. Thankfully, serial flash memory devices provide the solution. Serial flash is a small, low-power NOR flash memory that uses SPI (Serial Peripheral Interface) bus, sometimes called “four wire” serial bus, for sequential data access.

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Bridging the Worlds of Hardware and Software with USB-based FPGA

September 10, 2009 6:42 am | by Jake Janovetz, President, Opal Kelly | Comments

Field-Programmable Gate Arrays (FPGA) are the most flexible and capable devices available to interface to a large variety of system devices such as memories, data acquisition (ADC/DAC), image sensors, displays, and so on.  Often, the goal is to interface these system devices to a software infrastructure running on a workstation platform

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Precision Power Control in Electro-Optics

September 8, 2009 7:17 am | by Mary Johnson, Wavelength Electronics | Comments

As new laser devices become available, their complexity is met with increasingly sophisticated electronics that allow continuous refinement of precision.  As optical systems mature, new processes and procedures are made possible.  These include: lasers in medical diagnostic and treatment equipment (e.g. Optical Coherence Tomography (OCT)), increased sensitivity for environmental monitoring equipment

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Battery and Charge Management: Choices and Tradeoffs

September 8, 2009 6:30 am | by Masoud Beheshti, Director, Product Line Manager, Texas Instruments | Comments

Designers of portable electronic devices have a variety of choices on types of chemistries, charger topologies and charge management solutions. Selecting the most suitable solution should be a simple task, but in most cases, it is a more complicated process. The designer needs to reach an optimal balance between performance, cost, form factor and other key requirements.

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Supercapacitors Replace Batteries with Help of 3mm × 3mm Charger

September 8, 2009 5:51 am | by Jim Drew, Sr. Applications Engineer, Linear Technology | Comments

Supercapacitors are finding their way into an increasing number of applications for short-term energy storage. One such application is a power ride-through circuit, in which a backup energy source cuts in and powers the load when main power supply fails for a short time. This type of application has been dominated by batteries in the past

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Choosing the right IGBT Trade-Offs to maximize Motor Drive performance

September 8, 2009 5:29 am | by Vijay Bolloju, Jun Yang , & Elk Kabaker, IGBT Applications Engineering group, International Rectifier | Comments

Recent advances in IGBT technology have given motor drive designers more options to consider for system development.  Different specification conventions of various vendors complicate the design process further.  Conventionally, system efficiency has been equated directly with VCEON.  This metric is important for calculating the conduction losses of an IGBT but leaves out switching losses completely.

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Constant Current Regulation delivers HB-LED advances

September 4, 2009 8:23 am | by Tim Kaske & Paul Decloedt, On Semiconductor | Comments

In recent years significant advances in high-brightness LEDs (HB-LEDs) have given designers the opportunity to replace conventional incandescent, fluorescent and halogen technologies with more reliable and energy-efficient LED-based alternatives. As a result, solid-state lighting has seen considerable uptake in automotive, digital signage, and architectural applications, as well as the illumination of our city streets.

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Power over Camera Link Standard Saves Space in Factory Floor Machinery

September 2, 2009 11:35 am | by Dan Cronch, Product Development Specialist, 3M Electronic Solutions Division | Comments

In Japan, space is a precious commodity. In the manufacturing setting, companies strive to make the most of every square inch. To that end, the Japan Industrial Imaging Association (JIIA) led the development of the Power over Camera Link (PoCL) Interface Standard for digital cameras and frame grabbers used in Machine Vision systems.

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SuperSpeed USB: A USB 3.0 Update

September 2, 2009 7:35 am | by Jon Titus, Senior Technical Editor | Comments

SuperSpeed USB connections — coming in 2010 — will zip data between devices at a theoretical rate of 5 Gbps, or more than 10-fold faster than a high-speed USB 2.0 connection. The faster transfers could help embedded-system developers who design video kiosks, TV recorders/players, and test-and-measurement equipment that use large quantities of information.

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