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Tech Advances Impact Motion Control  10/8/2009 10:08:00 AM
There are a number of technology trends that are profoundly changing how engineers are designing machines with motion control. Two among these stand out for their potential impact on cost, ease of assembly, and serviceability. These are the continual reduction of the size of the motion amplifier, and the advent of low cost, high-speed digital networks.

Driving 3-Phase Induction Motors  10/6/2009 9:56:00 AM
Although an increasing interest and use of Permanent Magnet Synchronous Motors (PMSM) can be observed during the last decade, the standard 3-phase Induction Motor (IM) is still the most widely used electrical motor. The simplest way to start an IM is to connect the motor directly to the 3-phase main supply.

Successful PCB Design, Engineering, and Production Considerations for Medical Electronic Assemblies  10/5/2009 9:02:00 AM
Med_Board-webMedical electronic assemblies have unique requirements that set them apart from other types of electronic devices, such as consumer electronic products. Often, thermal management issues must be anticipated in the design, and assemblers must conform to certain quality standards such as ISO 13485.

Storage in Streaming Media: Advanced Solid State Storage SSDs Meet Performance and Reliability Demands  9/29/2009 4:22:00 PM
The rapid adoption of streaming media in embedded applications has been largely driven by decreasing bandwidth costs. In 2005, it cost approximately $.89 per gigabyte (GB) delivered for up to 49,000 GB (47.8 terabytes) of bandwidth.  Today, a major content provider could pay a meager $.05 per GB delivered for 500 terabytes of bandwidth.

Designing SSDs for write-intensive Embedded System Applications  9/25/2009 2:52:00 PM
Write-intensive applications require a mix of controller, storage media, and solid state storage management algorithms to achieve optimal endurance and lifespan, while read-intensive applications just go for the lowest cost per gigabyte. A key design metric for long product lifespan requires an understanding of the concept of write amplification and its crushing affects resulting in SSD failure when overlooked.

Data Acquisition Rules of the Road: Selecting High-Speed Differential ADC Drivers Part 2  9/17/2009 11:30:00 AM
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.

Data Acquisition Rules of the Road: Selecting High-Speed Differential ADC Drivers  9/15/2009 10:04:00 AM
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.

Serial Flash Memory: The Solution to a Shrinking Problem  9/10/2009 2:02:00 PM
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.

Choosing the right IGBT Trade-Offs to maximize Motor Drive performance  9/8/2009 9:28:00 AM
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.

Crosstalk in Multi-Channel High-Speed ADCs  8/13/2009 2:12:00 PM
In the push to increase bandwidth, range and sensitivity in wide bandwidth systems, multi-antenna and multi-sensor arrays are becoming increasingly popular. With each antenna or sensor requiring its own signal chain, many analog-to-digital converter (ADC) suppliers are integrating multiple high-speed ADCs into a single IC design.



 




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