Schurter now offers an assortment of filters with ambient temperature ratings at 75ºC. The filters have cURus and ENEC approvals ranging from 6A at 275/480 VAC to 1100A at 480/520 VAC, according to derating curves at 40-50ºC and 75ºC. Applications such as frequency converters, stepper motor drives, UPS system and inverters are ideally suited for these filter products. … [Read more...]
Choosing Optical Coatings for Medical Displays to Enhance Display Performance – Free White Paper
Dontech provides a wide range of optical filters and coatings for EMI/RFI shielding of LCDs and enclosures. Offerings include high transmission ITO coatings on glass (with resistances … [Read more...]
Tunable RF Filters for Next-Generation Radio Communications and Radar
Active Spectrum has announced what it touts as a breakthrough in tunable filter technology for co-site interference mitigation in next generation wireless communication systems and radar. According to the announcement, the new miniature tunable filters have the capability for isolating transmit and receive signals, including low insertion loss (1.0dB), high RF power handling … [Read more...]
Automotive Power MOSFETs Limit EMI
International Rectifier’s automotive DirectFET power MOSFETs are optimized with low gate charge for switching applications. Low parasitic inductance provided by the DirectFET power package results in excellent high frequency switching performance with reduced waveform ringing which in turn helps limit EMI and filter size.These first automotive DirectFET2 devices from IR are … [Read more...]
Holding Steady
As the economy gained momentum in late 2009 and early 2010, engineering organizations, like every other business sector, sensed promise that a strong, self-sustaining recovery was kicking in. However, as government spending to stimulate the economy trailed off and businesses concentrated on rebuilding their inventories, the growth rated started to slow – a pattern that … [Read more...]
System Compatibility: An Essential Ingredient for Achieving Electromagnetic Compatibility and Power Quality for Lighting Control Systems
Philip Keebler, Kermit Phipps, Frank Sharp, EPRI Lighting Laboratory For years, lighting systems have been operating as stand-alone loads without the use of sophisticated lighting controls for energy savings in all types of facilities—residential, commercial, and industrial. Utilities and end users viewed lighting controls in the past as, luxury, systems that were used only … [Read more...]
Differential Transfer Impedance of Shielded Twisted Pairs
Michel Mardiguian, EMC Consultant, Saint-Rémy-lès-Chevreuse, France The concept of Shield Transfer Impedance (Zt), introduced by S. Schelkunoff in 1934, is a very convenient parameter for the prediction and control of EMI coupling through cable shields. Although widely applied to coaxial cables against EMI susceptibility problems, the Zt parameter can be easily extended to … [Read more...]
Clocking Strategies for EMI Reduction
Sassan Tabatabaei, SiTime Corporation Electronic devices have to operate in close proximity, whether it is in the home, office, industrial establishment, or outdoors. Each of the devices may radiate electromagnetic energy, which can interfere with the operation of the rest of the devices. To avoid such harmful interference, governments and industry bodies limit the amount of … [Read more...]
EMC Performance of a Product Over Its Lifetime
Gert Gremmen, Tim Haynes, Ralph McDiarmid, Ed Price, John Woodgate EMC performance of a product is likely to vary with age as the physical characteristics change, e.g. caps dry out and metal junctions oxidize, etc. Obviously, the product is designed with the intention of consistent compliance over the life of the product, but are there any requirements or guidance relating to … [Read more...]
Effective EMC Troubleshooting with Handheld Probes
EMC testing is an unavoidable part of the development cycle for electronic products. As clock frequencies continue to increase, radiated emissions get harder to control. In an ideal world, the R&D engineer would test the emissions from his product early in the design stage and retest frequently as design changes were made, just ass he tests whether his product meets its … [Read more...]
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