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What is EMI?

Short for electromagnetic interference, a naturally occurring phenomena when the electromagnetic field of onedevice disrupts, impedes or degrades the electromagnetic field of another device by coming into proximity with it.

In computer technology, computer devices are susceptible to EMI because electromagnetic fields are a byproduct of passing electricity through a wire. Data lines that have not been properly shielded are susceptible to data corruption by EMI.

Source: Webopedia
Technical Archives related to EMI:
Design a multimedia interface having low EMI 2006-07-26
Careful design is needed to ensure low EMI when providing an automotive multimedia interface
EMI shielding strategies for design and attachment options 2000-12-01
This technical article describes methods to contain EMI and achieve EMC
Serial buses cut EMI, cabling constraints in 3G cam phones 2005-01-17
Serdes plays a role in reducing cabling constraints and EMI when interfacing cameras and LCDs to baseband processors in mobile phones
EMI from the ground up: Maxwell to CISPR 2004-07-16
To quash the veritable balloon called EMI, all we need is some physics and a clear understanding of 'power
Eliminating EMI protection components 2007-12-31
This article explains how the faraday cage or ?picket fence? approach to PCB design can reduce production costs by eliminating EMI protection components
Employ fencing for best EMI protection 2008-07-15
Use the Faraday cage approach for PCB design and layout to eliminate costly EMI protection components
Reduce switcher EMI with frequency spreading 2007-04-10
When using multiple switching regulators is appropriate, multi-phase synchronisation offers clear benefits, including reduced EMI. As for the EMI benefits of SSFM, it depends on the bandwidths of interest. SSFM is not a substitute for proper design, but it may offer the improvement that achieves EMC compliance
Eliminating EMI protection components (1 2007-12-31
This article focuses on the use of the faraday cage or "picket fence" approach to PCB design and layout to eliminate costly EMI protection components
Testing system design components for EMI problems 2007-02-16
This article details how new standards from the International Electrotechnical Commision will change EMI/EMC testing methods
Spread spectrum clocking to reduce EMI 2008-04-28
Spread spectrum clocking (SSC) is an efficient, effective and less costly alternative method for controlling EMI
Reduce EMI with spread spectrum clock generators 2008-04-07
To control EMI in consumer devices clock parameters like PLL charge pump current, VCO gain, and output drive strength, need to be programmable
Using automatic Emscan in high-speed PCB design 2003-09-01
Emscan claims that its system provides an efficient way of evaluating the replacement component's usability, reducing production cost without any compromise to EMI integrity
Techniques for handling electromagnetic interference 2001-01-01
This technology article focuses on the primary steps that engineers can take at the PCB level to control common-mode radiated EMI
Test EMC using novel time-domain methods 2004-02-02
This article covers new ways of signal processing to use time-domain measurement techniques to perform accurate and time efficient EMI measurements
Minimizing RF effects during PCB design 2001-08-16
An essential read for all designing high-frequency boards, this article describes certain techniques that help minimize EMI effects on PCBs
New Products related to EMI:
EMI suppression devices protect Ethernet apps 2007-12-28
Akros Silicon has offered active EMI suppression devices that integrate unique active chokes that provide 10dB of additional CM noise suppression over the entire Ethernet bandwidth, allowing designers to meet Class B compliance
EMI filters reduce PCB size 2007-03-27
NXP's ultrathin EMI filters enable handheld designers to reduce the size of their PCBs while doubling the level of integrated ESD protection
EMI test receiver offers FFT-based time domain scan 2006-08-28
Rohde & Schwarz has introduced the R&S ESU, a family of CISPR16-1-1-compliant EMI test receivers, claimed to be the first to offer FFT-based time domain scan capabilities
Murata's new EMI filter mixes small size, large insertion loss 2005-09-06
Murata commercialized its BNX022 series of EMI suppression filters thar are suitable for noise suppression in DC power supply lines for amusement and industrial equipment
USB connectors incorporate EMI, ESD filters 2008-01-29
Spectrum Control has developed a series of USB connectors that saves PCB space and delivers better protection for the entire device by incorporating EMI or ESD filters into an industry-standard USB package
EMI filter array includes ESD functions 2006-10-05
TDK has announced the development of the MEA2010LV series of multilayer chip EMI filter arrays with electrostatic discharge countermeasure functions
Resin-sealed bolt-in EMI filters are RoHS compliant 2006-05-10
Spectrum Control Inc. is offering RoHS/lead-free versions of its resin-sealed bolt-in EMI filters
EMI filters protect data lines in mobile apps 2006-03-06
Vishay Intertechnology has launched six EMI filter arrays with integrated ESD protection diodes in ultra-small leadless, plastic packages. These devices provide both EMI filtering and ESD protection for data lines in space critical mobile applications
Laird Tech introduces beryllium-free EMI solution 2006-08-22
Laird Technologies has introduced the Recyclable Clean Copper range of environmentally friendly, copper-based shielding gaskets that offer a beryllium-free EMI solution for use in a wide range of slotted applications
Op amps deliver 120dB EMI rejection ratio 2008-08-28
National has introduced op amps with integrated EMI filters that reduces the effects of RF interference
EMI filter for cell phones has ESD countermeasure 2006-10-10
TDK Corp. has developed a series of multilayer chip EMI filter arrays with ESD countermeasure functions. Designed for cell phones, these devices combine the noise countermeasure functions of EMI filter arrays with features that protect circuits from static electricity
EMI filters target cell phone audio 2005-12-23
CMD's CM1418 and CM1419 EMI inductor-based filter arrays with ESD protection are aimed at audio applications in wireless handsets
EMI cage performs double duty 2005-08-09
dataMate introduced its rugged, dual port, SFP EMI cage with dual transceiver hosting and EMI protection for both copper and optical SFP transceivers for Fiber Channel, Gigabit Ethernet and Infiniband apps
EMI filter features ESD protection for wireless handsets 2006-03-08
California Micro Devices has launched its next generation of Praetorian EMI filter with ESD protection for wireless handsets that offers a roll off of 20dB/octave and attenuation greater than 30dB between 800MHz and 3GHz with a typical corner frequency of 300MHz
EMI filters offer two attenuation levels 2006-07-14
Lambda has developed industrial EMI filters that provide two levels of electrical noise attenuation in the same-size package
News & Trends related to EMI:
X-EMI readies chips to cut EMI by 20 dB 2005-08-11
A startup with roots in the network-processor company SiTera Inc. has demonstrated a unique solution to electromagnetic interference problems at a vertical EMI show in Chicago
Startup tames EMI using spectral-diffusion scheme 2005-10-03
X-EMI Inc. uses a method of spectral diffusion that modifies system clocks to reduce EMI from various sources
Players address EMI problem in clock chip designs 2007-09-13
Cypress Semiconductor and SpectraLinear have introduced clock chips based on spread-spectrum tech, which promises to tackle the growing problem of electromagnetic interference in clock chip designs.
Rivals roll spread-spectrum clock chips 2007-11-02
Cypress and SpectraLinear have introduced clock chips based on spread-spectrum technology, which promises to tackle the growing problem of EMI in clock chip designs
RFID devices interfere with medical equipment 2008-06-27
The use of RFID in hospitals can interfere with critical care medical electronics according to a report by University of Amsterdam researchers.
Wireless blocking paint protects in-building data from hackers 2007-03-20
EM-SEC Technologies announced it has developed a novel way to protect in-building wireless data from unauthorised incursions, block electromagnetic interference and reduce the threat of electronic eavesdropping.
Sanmina-SCI licenses Buried Capacitance to ISU Petasys 2005-08-15
Sanmina-SCI Corp. has entered into a licensing agreement with ISU Petasys Corp. to manufacture multilayer PCBs using Sanmina-SCI's patented Buried Capacitance (BC) technology.
DVD, Kaleidescape argue on digital media security 2007-07-05
The legal dispute between the DVD CCA and Kaleidescape focuses on the digital media rights of the owners and users and the need of security in digital media era.
China gears up for more innovative design 2007-01-08
Although there is still a lot of work to be done in mainland China's R&D sector, there has been remarkable progress especially in the communication and consumer electronics (CE) front.
Make right choices when building Zigbee apps 2005-09-16
Increase your Zigbee's performance without encountering drawbacks in your design platforms.
Efficient DC/DC converter saves power in portable design 2007-10-16
Two features of an advanced power mgmt IC design contribute to the efficiency of its operation: the integration of internal feedback mechanisms and the inclusion of a power-save mode to conserve energy during operation.
Barriers to MEMS commercialisation 2008-10-23
A major barrier to MEMS commercialisation has been the lack of design for manufacturing and test strategies.
Laird Technologies establishes India research lab 2007-07-13
Laird Technologies' newly established corporate research lab in Bangalore will focus on longer-term research in materials and multi-functional products for use in electronic components and systems.
Demo shows 6Gbps SAS interoperability 2008-05-08
LSI, Dell and Seagate demonstrated the interoperability of 6Gbit/SAS I/O throughput and data integrity confirmation.
Mobile entertainment industry to drive wireless data usage in Asia 2005-10-26
According to the UMTS Forum, the mobile entertainment industry is expected to generate revenues of up to US$47 billion by 2010 in the Asia-Pacific. This positions mobile entertainment as a key driver for wireless data usage and revenue.
Application Notes related to EMI:
App Note 3512: Spread-spectrum clock oscillators lower EMI 2005-06-08
This app note discusses how spread-spectrum clocks can aid EMI reduction, as well as reduce BOM cost, by reducing the amount of filtering and shielding required
Reduced electromagnetic interference (EMI) with the TMS320C24x DSP 2001-05-14
This application note discusses how a designer can reduce EMI in digital motor control applications using Texas Instruments' TMS320C24x DSP controller
Conducted EMI filter design for the NCP1200 2005-06-20
This app note briefly describes the mechanism of conducted EMI noise generation and depicts a way to circumvent it
EMI suppression techniques with spread spectrum frequency timing generator (SSFTG) ICs 2001-03-22
This application note describes the operation, advantages and limitations of spread spectrum technique in suppressing/reducing the effect of EMI within electronic devices
PCK2001 (CKBF) reduced EMI techniques 2002-11-08
This application note describes the background, technique and results of EMI measurements on the PCK2001 (CKBF), showing reduced EMI emissions over standard design techniques
EMI reduction techniques 2000-11-29
This application note suggests some tips, including the spread spectrum technique, on how to effectively reduce the EMI effect generated by higher clock speeds in PCs and workstations
EMI characteristics 2000-12-04
This application note will give an overview of EMI, the appropriate standards and regulations, how these standards and regulations relate to dc/dc power modules, suggestions for external filtering solutions, and suggested layout and grounding practices
Design considerations for ESD/EMI filters: I 2005-06-23
This app note demonstrates design considerations for ESD/EMI filters
Using the DS1086 as a Microcontroller Clocler to Reduce EMI 2003-06-28
Using the DS1086 as a Microcontroller Clocler to Reduce EMI
Countering EMI in Class D audio applications 2008-09-09
EMI and noise can be suppressed through other means such as better segregation at the circuit level
EMI considerations for dc/dc converters and integrated switching regulators 2001-09-21
EMI considerations for dc/dc converters and integrated switching regulators
CS4297A/CS4299 EMI reduction techniques 2001-04-16
This application note describes EMI reduction techniques for Crystal Semiconductor's CS4297A and CS4299 AC '97 audio codecs
Real-time spectrum analysis for EMI diagnostics 2008-07-18
Reduce the minimum signal duration to guarantee 100 per cent probability of intercept of transients.
EMI immunity testing for automotive components 2005-02-01
Select the best test method to use for increasingly complex automotive environments.
Transmitter EMI reduction 2001-10-04
This application note is intended to provide the reader with a real-world application that can be emulated to solve most noise-related signal conditioning problems.
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