Circuit techniques minimize temperature dependence for DPPs News & Analysis 6/26/2002 Post a comment The digitally programmable potentiometer (DPP) has two temperature dependent parameters, writes this now-famous applications guru. The temperature dependence of an analog circuit using a DPP is reduced if the main temperature coefficient can be shifted from the end-to-end resistance of the pot to a more ratiometric value. Catalyst Semiconductor's Chuck Wojslaw gives details.
Motion control technology jumps into the driver's seat News & Analysis 6/26/2002 Post a comment Today's motion control technology - specifically variable speed motor control - offers a navigation path to the high performing, fuel-efficient vehicles of the future. Running a car from multiple motors (instead of a single fan belt) enables peppy acceleration, precision steering and ride control - all with greater fuel economy. Power management electronics plays a key role, says visionary Alex Lidow.
Database Modeling in UML News & Analysis 6/25/2002 Post a comment When it comes to providing reliable, flexible, and efficient object persistence for software systems, today's designers and architects are faced with many choices. From the technological perspective, the choice is usually between pure Object-Oriented, Object-Relational hybrids, pure Relational, and custom solutions based on open or proprietary file formats. In this feature article, Geoffrey Sparks addresses one of those choices, the layering of an object-oriented class model on top of a purely r
Robots called electronics driver of 21st century News & Analysis 6/24/2002 Post a comment As the competitive field narrows for World Cup soccer, Honda Motor's Asimo robot kicked a soccer ball to start the RoboCup competition last Thursday (June 20) as part of the Robotrex 2002 exhibition, where developers and builders forecast a broad, expanding market for robots.
Studios pause as audiophiles embrace digital News & Analysis 6/21/2002 Post a comment The next big format for music may be just plain bits. Many audiophiles who have amassed collections of vinyl records, cassette tapes and compact disks see digital as the ultimate format-though it's not clear where users will house liner notes and album cover art.
Linux System Development on an Embedded Device News & Analysis 6/19/2002 Post a comment Embedded Linux development for embedded devices such as broadly involves three tiers: the bootloader, the Linux kernel, and the GUI. In this article, IBM's Anand K. Santhanam and Vishal Kulkarni focus on some basic concepts involving these three tiers; provide some insights into how the bootloader, kernel, and filesystem interact; and investigate some of the numerous options available for the filesystem, GUI, and bootloaders.
Test techniques provide insights for noise-sensitive applications News & Analysis 6/12/2002 Post a comment If there is an analog-to-digital (A/D) converter in the signal path of your signal-condition system, there are three fundamental tools that can be used when assessing the circuit's performance. These include frequency analysis (FFTs), time analysis, and DC analysis techniques. In this tutorial, Microchip Technology's famous apps engineer, Bonnie Baker, offers some waveforms - and advisories for interpreting them.
Engineers note: Capacitors are key to voltage regulator design News & Analysis 6/12/2002 1 comment Why do LDOs hate ceramic bypass capacitors? Why do LDOs oscillate? Some 99 percent of the "design" problems associated with linear and switching regulators can be traced to the capacitors: the wrong type, the wrong value, or bad physical placement. National Semiconductor's power supply technologist, Chester Simpson offers some long overdue advisories.
Network vendors brew Ethernet/SONET hybrid News & Analysis 6/10/2002 Post a comment System vendors are welcoming new technologies for carrying Ethernet over synchronous optical networks (SONET), a development that will enable additional services on their previously SONET-only platforms.
Successfully Using Linux and Open Software in an Embedded System Design News & Analysis 6/10/2002 Post a comment Fueled by time-to-market pressures and the need to reduce overall system cost, many developers are migrating to Linux and open-systems software in their embedded systems designs. There are some real challenges that face an embedded designer who wishes to use Linux in his product. LynuxWorks' Greg Rose presents questions developers should ask while planning embedded designs, how Linux stacks up, and how to overcome some of those challenges.
MEMs eye dynamic optical products News & Analysis 6/6/2002 Post a comment The current slowdown in telecommunications spending clearly indicates that increased bandwidth capacity will not automatically translate into increased demand for the optical components and subsystems needed to enhance the network infrastructure.
ALF facilitates SI-aware design flow News & Analysis 6/5/2002 Post a comment Many of the challenges facing EDA tool users graduating to ASIC-style system-on-chip (SoC) design at 0.13 micron and below can be addressed through the use of new methodologies taking advantage of the Advanced Library Format (ALF).
FPGA Designs Take on Timing Closures News & Analysis 6/4/2002 Post a comment Over the last couple of years, FPGAs have made amazing advances in performance and capacity. Solutions, such as physical synthesis, are now needed that allow designers to take advantage of these improvements.
MEMS Overview News & Analysis 6/4/2002 Post a comment In the "smaller is better" world of microelectromechanical systems
(MEMS), device processing is king. This overview from Sandia
National Laboratories describes the intricate manufacturing processing
you need to add to a CMOS device to build viable MEMS-based SoCs.
Clocking Strategies for QDRII, DDRII Designs News & Analysis 6/4/2002 Post a comment To meet the high-speed requirements of designers, second-generation QDR and DDR memories are on the way. In addition to delivering wider bus widths, these memory schemes provide a host of clocking options.
System C: a realistic SoC debug strategy News & Analysis 6/3/2002 Post a comment As Moore's Law steams ahead, the resulting rush to retool for ever-smaller geometries has led to the realization by most leading companies designing systems-on-chip that the emphasis in SoCs is on that "S," for system.
Reconfigurable IP requires a flexible software development toolset News & Analysis 6/3/2002 Post a comment Until recently SoC technology was considered the exclusive domain of high-tech multinational companies. That's because of the high entrance barriers: the need for diverse and complex expertise, the high costs of hardware and software development tools and the shipment volumes required to justify the cost of ASIC development.
Embedded real-time behavior requires "design-in" processes News & Analysis 6/3/2002 Post a comment In embedded environments, where the reliability of one element of a design often dictates the reliability of the whole, issues such a real-time correctness is best achieved through "design-in" techniques rather than the traditional "test-in" timing performance procedures at the end of development.