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EMI Suppression Filters Application Guide
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Catalog excerpts

EMI Suppression Filters Application Guide - 1

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Noise Suppression by EMIFIL® Application Guide Application Manual

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EMI Suppression Filters Application Guide - 2

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Introduction To make effective noise suppression in electronic equipment it is necessary for design engineers to have a good understanding of the various types of EMI suppression filters available and the characteristics so that they can use suitable...

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EMI Suppression Filters Application Guide - 3

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 1 Example of Noise Suppression in Desktop PCs 2 Example of Noise Suppression in Notebook PCs 3 Example of Noise Suppression for USB's 4 Example of Noise Suppression in CD-ROM Drives 5 Example of Noise Suppression in DVD Players 6 Example of Noise...

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EMI Suppression Filters Application Guide - 4

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 1 Example of Noise Suppression in Desktop PCs Noise Emission Status : Noise is emitted from the cables connected to a personal computer. When using a computer case that does not have efficient shielding, radiated noise from the computer body may sometimes...

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EMI Suppression Filters Application Guide - 5

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Desktop PCs Noise Suppression Content in Personal Computers A PC contains many sources of noise inside and out, with many connected cables. Therefore, it is necessary to use EMI filters on the interface cables, in addition to...

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EMI Suppression Filters Application Guide - 6

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Desktop PCs Improving Shielding Parts of the metal case make contact with each other by surface contact, where fingers and gaskets are used where necessary to minimize the impedance of contact points at high frequencies....

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EMI Suppression Filters Application Guide - 7

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Desktop PCs Example of effects produced when improving the GND and installing EMI filters on the cable connector port In the data above the GND is improved by increasing the number of connection points between the board and...

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EMI Suppression Filters Application Guide - 8

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Desktop PCs Improving the GND on Extension Boards In case of installing an extension board with a cable, noise may conduct to the cable when GND noise level is high. This results in high-level noise radiation from the cable....

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EMI Suppression Filters Application Guide - 9

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. 2 Example of Noise Suppression in Notebook PCs Noise Emission Status : Noise emission from PC body, LCD, connection cables, and connection cable between PC body and LCD. In notebook PCs, PCBs incorporate many signal lines with high-level noise. Generally,...

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EMI Suppression Filters Application Guide - 10

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Notebook PCs Noise Suppression Content in Notebook Personal Computers Notebook PC components are mounted in a limited space. Therefore, it is important to intensify the shielding condition as much as possible to suppress...

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EMI Suppression Filters Application Guide - 11

Note • Please read rating and CAUTION (for storage and operating, rating, soldering and mounting, handling) in this catalog to prevent smoking and/or burning, etc. • This catalog has only typical specifications. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering. Example of Noise Suppression in Notebook PCs Improving the Case Shielding and GND Connection Since plastic is usually used to encase a notebook PC, conductive plating is applied to the inside of the case. However, conductive plating alone is not sufficient...

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