A new EMI filter plate from Spectrum Control comes with a special epoxy potting and rubber pin protector for applications in which rough handling or challenging environmental conditions are typical. The filter plates utilize ceramic capacitors as the filter element, and the special potting protects their electrical and mechanical integrity during shipping and typical use. The … [Read more...]
Boxes Incorporate EMI/RFI Shielding
The new LI0201 line of ferrite chip beads from Laird Technologies features a smaller miniature footprint suitable for use in advanced handheld devices such as cell phones and PDAs. This series offers superior impedance versus frequency characteristics with low DCR for EMI noise suppression on high-frequency or broadband digital signal lines. The 0.6 mm x 0.3 mm x 0.3 mm … [Read more...]
GPS Module Includes Filters to Forestall Interference in New Mobile Telecom Apps
The new BGM681L11 from Germany’s Infineon Technologies AG is being debuted as “the world’s smallest GPS receive front-end module. The necessity of forestalling interference with cellular signals and the constraints of limited PCB space are two of the major design challenges encountered in designing the next generation of wireless, multi-function cell phones. The BGM681L11 … [Read more...]
Flexible Lead EMI Filters Offer Design Options
New Flex Lead EMI filters from Pacific Aerospace and Electronic (PA&E) offer new options when choosing an EMI filter. These new filters are said to offer several advantages over conventional filtering approaches. Reliability is boosted by the elimination of a solder joint, and the lead insulation encapsulated within the filter body reduces the potential for accidental … [Read more...]
Spectrum Control Expands Capabilities with Purchase of SatCon Electronics
Spectrum Control, well known manufacturer of EMI-control and other high-tech electronic products and systems, has announced that Spectrum Microwave, its wholly-owned subsidiary, has acquired substantially all the assets and has assumed certain of the liabilities of SatCon Electronics, Inc. of Marlborough, MA, a designer and manufacturer of high-performance microelectronic … [Read more...]
MIL-COTS Front End Module Performs EMI Filtering
The MFIAM9 28-V-input attenuator module from Vicor Power supplies EMI filtering and transient protection for Vicor’s Maxi, Mini, and Micro Series of 24-V-input DC/DC converters. The front end filter module enables designers to meet the conducted emission and conducted susceptibility requirements of MIL-STD-461E, as well as the input transient requirements of MIL-STD-704A/E/F … [Read more...]
New X2 EMI Suppression Film Capacitors Feature Increased Voltage Rating
The new MKP 339 X2, MKP 338 2 X2, and MKP 336 2 X2 from Vishay Intertechnology are X2 EMI suppression film capacitors with an increased maximum mains voltage of 310 VAC and a wide range of lead pitches and capacitance values. These devices differ from conventional EMI suppression capacitors that offer a typical voltage range of 275 VAC to 305 VAC. They offer designers an … [Read more...]
Meeting Military Requirements for EMC and Transient Voltage Spike Suppression
The basics of EMI and transient compliance for military systems using SMPSs are covered. Dr. Glenn Skutt, VPT, Inc., Blacksburg, Virginia, USA THE EMI AND VOLTAGE TRANSIENT CHALLENGE Military and aerospace engineers face several challenges with respect to electromagnetic interference (EMI) and transient voltage compliance. The standards developed by the various military … [Read more...]
Inrush Current in DC-DC Converters
Some applications may require limiting the inrush spike into the input capacitors. Steve Butler and Jeremy Ferrell, VPT, Inc., Blacksburg, Virginia, USA BACKGROUND Inrush current is the spike of current drawn by a power supply when it is turned on. A typical power system is shown in Figure 1. The input EMI filter will include some capacitance connected across the input … [Read more...]
Enhanced Test System Targets Emissions Testing from 9 kHz to 30 MHz
A newly released version of GAUSS Instruments’ “TDEMI” test systems carries out emissions testing from 9 kHz to 30 MHz. The original version, released earlier this year, handled the frequency range of 150 kHz to 1 GHz. With the new “TDEMI30M” a quasi-peak measurement in Band A or Band B can take as little as 12 seconds. The “TDEMI” measurement system from GAUSS Instruments … [Read more...]
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