EMC CL and LC Filters Comparison

  • Posted by doEEEt Media Group
  • On May 25, 2020
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First, the insertion loss a general filter is defined, and then the impact of the source and load impedance on the insertion loss is investigated. Simulations and measurements focus on the CL and LC filters. In Part II (to appear in the next issue) the performance of the Pi and T filters is evaluated and compared to that of the CL and LC filters.
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The Top Five Reasons Products Fail EMI Testing

  • Posted by doEEEt Media Group
  • On May 25, 2020
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PC Board Design—Poor layout and layer stack-up Cable Shield Termination and Pigtails—Cable shields are not terminated to an enclosure or lack of common-mode filtering for unshielded products, plus shield pigtails used Gaps in the Return-Path—High-frequency clocks or signals crossing gaps in the return path Power Distribution Design—Poor power distribution network (PDN) design Shielding Design—Apertures or slots in the shielded enclosure that are too long
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Ceramic Feedthrough Filters Explained

  • Posted by doEEEt Media Group
  • On May 8, 2020
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EMI is a serious concern for devices that are externally powered (ones that have a plug) or require signal wires that need to extend outside the device (signal wires that might attach to sensors or input/output devices). The wires that connect to power sources, or I/O points, can act as antennas that will allow EMI to be received (coupled onto them) and enter the device.
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Vishay Expands its Low profile, High Current E-Shield Reduced EMI Inductor Series

  • Posted by doEEEt Media Group
  • On April 29, 2020
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The devices released today contain the electric and B field associated with EMI in a tin-plated copper integrated shield, providing up to -20 dB of electric field reduction at 1 cm (above the centre of the inductor) when the integrated shield is connected to ground. Featuring high-temperature operation to +155 °C and coplanarity of their four terminals within ≤ 100 µm, the inductors are optimized for energy storage in DC/DC converters up to 2 MHz and provide excellent attenuation of noise in high current filtering applications up to the SRF of the inductor.
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Ceramic Safety Capacitors | Kemet webinar

  • Posted by doEEEt Media Group
  • On April 24, 2020
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There are several options of technologies for safety capacitors. In this webinar, we will look at the purpose of EMI filter capacitors and what it means to be a “safety” capacitors as well as when to use ceramic technologies and their advantages.
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Clarifying MIL-STD-461 and EMI Filter Misconceptions

  • Posted by doEEEt Media Group
  • On March 19, 2020
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The US MIL-STD-461 specification manages electromagnetic interference emissions by setting limits on the levels that can be emitted from electrical equipment. This specification also sets regulation to control equipment susceptibility to external noise sources and establishes guidelines for properly measuring the relevant equipment features.
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