Special Feature: A World With, and a World Without Noise Suppression

    What If We Didn’t Have Noise Suppression Technology?

    Today our life is flooded with electronic equipment such as smartphones, PCs, TVs and in-vehicle systems.
    Many of these devices are fitted with wireless and digital circuits, which — whether purposefully or not — emit various kinds of electromagnetic waves. As a result, such electromagnetic waves can negatively affect other electronic devices being used in the vicinity. This kind of disturbance is known as electromagnetic interference, and it is becoming more and more common.

    Table of contents

    Noise Suppression Technology Creates Balanced Electromagnetic Environments

    Emission Measures and Immunity Measures

    Two kinds of measures are necessary to ensure that a number of electronic devices in a limited space function normally without interfering with each other. Emission measures prevent devices from generating noise, while immunity measures are designed to prevent devices from being affected when they are exposed to noise generated by other devices. If an environment is balanced with both kinds of measures to ensure that electronic devices operate in close vicinity without mutual interference, or electromagnetic interference (EMI) , such an environment is said to maintain electromagnetic compatibility (EMC) . EMI filters are noise suppression components indispensable for EMI suppression.

    The dissemination of smartphones and increasing use of electronics in vehicles mean that we are always increasingly surrounded by electronics. Many devices that incorporate wireless circuits and digital circuits in order to connect to the internet often suffer from mutual interference. Noise suppression technology for establishing EMC is becoming an increasingly important part of ensuring the proper operation of all electronic devices that are densely deployed.

    Development of the Electronic Society and Solutions from Murata
    ～Digital Symphony of EMI Filter Division Products with Diverse Functions～

    The Continuous Evolution of Murata Inductors and Noise Suppression Devices

    All aspects of our modern life are flooded with electronic devices. Increasingly downsized, integrating multiple functions, and handling radio frequencies, they use more power and emit stronger electromagnetic waves. So they generate noise, filling our living space with a complex mix of electromagnetic waves. In keeping with changing customer requirements and the trends of electronics, Murata’s inductors and noise suppression components continue to evolve with a broad lineup featuring diverse functions, helping customers achieve power savings in their products and create cleaner electromagnetic environments.

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    A History of Major Noise Regulations

    1934 CISPR (International Special Committee on Radio Interference) was established
    FCC (Federal Communications Commission) was established (USA)
    1973 CENELEC (European Committee for Electrotechnical Standardization) was established
    1977 CISPR Pub. 16 "Specification for radio disturbance measuring apparatus and methods" was issued
    1979 FCC Part 15 Subpart J "RADIO FREQUENCY DEVICES/Computing Devices" was issued
    - Initiation of noise regulations on digital equipment in the USA
    1985 VCCI (Voluntary Control Council for Interference by Information Technology Equipment) was established (Japan)
    - Initiation of noise regulations for information technology equipment in Japan CISPR Pub. 22 "Limits and methods of measurement of radio disturbance characteristics of information technology equipment" was issued - Initiation of international standard relating to information technology equipment
    1989 89/336/EEC "EMC Directive" was announced (Europe)
    FCC Part 15 Subpart B "RADIO FREQUENCY DEVICES/Unintentional Radiators" was issued (amendment of Subpart J)
    1996 EMC Directive came into effect
    - Initiation of noise regulations in Europe CISPR Pub. 16 amended, and "specification for radio disturbance and immunity measuring methods" was added
    1997 CISPR Pub. 24 "Information technology equipment - Immunity characteristics - Limits and methods of measurement" was issued
    CISPR Pub. 22 "Information technology equipment - Radio disturbance characteristics - Limits and methods of measurement" (Ed. 3.0) was issued
    1998 CISPR Pub. 16 amended, and "specification for radio disturbance and immunity measuring apparatus" was added
    2005 Revision of the CISPR Standards for information technology equipment (CISPR 22)
    Expansion of the range of test frequencies from 1 to 6GHz
    Additional regulations on communication line ports
    2006 Revision of the immunity standards IEC 61000-4-3
    Expansion of the range of test frequencies for radiation immunity from 2 to 2.7GHz
    2008 Revision of the CISPR Standards for equipment used on board of vehicles, boats, etc. (CISPR 25)
    Expansion of the range of test frequencies from 1 to 2.5GHz
    2010 The Qi Standards on wireless charging were established
    2011 Expansion of the range of test frequencies stipulated by VCCI (Voluntary Control Council for Interference by Information Technology Equipment) from 1 to 6GHz
    2012 The CISPR Standards for multimedia devices and receivers (CISPR 32) were established
    2013 Revision of the CISPR Standards for home electrical appliances and lighting equipment (CISPR 15)
    Rules on LED lighting equipment added

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