EMI Suppression Filters Application Guide 13/09/2013 by Murata Manufacturing Co.,Ltd.

More catalogs by Murata Manufacturing Co.,Ltd. | EMI Suppression Filters Application Guide 13/09/2013 | 52 pages | 2018-02-03

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Catalog EMI Suppression Filters Application Guide 13/09/2013

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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 c35e.pdf september.5,2013 1 example of noise suppression in desktop pcs noise emission status noise is emitted from the cables connected to a personal computer 1 when using a computer case that does not have efficient shielding radiated noise from the computer body may sometimes cause problems extension card back side of pc power supply usb mouse keyboard display cable 2 conducted noise radiated

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 c35e.pdf september.5,2013 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 notebook pcs use a resin case with conductive plating which provides a lower shielding effect than the metal case of desktop pcs causing high level noise to be emitted from the pc body furthermore they use many connection cables which also emit noise in most cases transmission signals to the lcd are lvdss low voltage differential signals since the lvdss are high-speed signals

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 3 c35e.pdf september.5,2013 example of noise suppression for usb s noise suppression content for usb 3 usb s support three types of transmission modes depending on the function of the connected device ls low speed 1.5mbps fs full speed 12mbps and hs high speed 480mbps in order to suppress noise emission without deforming the signal waveform it is necessary to take noise suppressing measures suitable for individual transmission modes for noise suppression in the ls/fs mode chip ferrite bead blm18bb121sn1 or common mode choke coil dlp11sn900hl2 should be mounted on the signal line and the blm pg series chip ferrite bead should be mounted on the

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 c35e.pdf september.5,2013 example of noise suppression in cd-rom drives 4 example of effects produced when installing the chip ferrite bead on the bus lines noise suppression effects produced when installing the blm series on the data bus lines before measure 60 noise level dbμv/m 50 40 before measure 30 4 20 10 30 50 100 150 200 250 300 frequency mhz after installing the chip ferrite bead on the bus lines chip ferrite bead inductor blm18ag601sn1 600Ω at 100mhz 60 dram 40 cpu noise level dbμv/m 50 30 20 bus line 8mhz 10 30 50 100 150 200 250 300 after installing the chip ferrite bead on the bus lines frequency mhz

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 5 c35e.pdf september.5,2013 example of noise suppression in dvd players installing emi filters on bus lines data bus/address bus lines contain many lines that switch on and off simultaneously an instantaneous large current flows into the gnd and power supply lines therefore it is necessary to suppress the current flow to the signal lines the blm series chip ferrite bead is generally used for this purpose on the control bus line especially at high operating speeds and high noise levels a filter with resistance components is used such as the nfr21g series chip emifil® chip ferrite bead blm18pg300sn1 30Ω at 100mhz vcc 5v chip ferrite bead

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 c35e.pdf september.5,2013 example of noise suppression in printers 6 installing emi filters on bus lines bus lines contain many lines that switch on and off simultaneously this causes instantaneous large currents to flow into the gnd and power supply lines through the data and address therefore it is necessary to suppress the current flow on the signal lines the blm series chip ferrite bead is generally used for this purpose on the control bus line especially at high operating speeds the blm□□b series chip ferrite bead for high-speed signal lines that features a steep impedance rising is used on bus lines with high-level noise the

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 c35e.pdf september.5,2013 example of noise suppression in fax machines 7 example of effects produced when installing emi filters on the clock lines noise suppression effects produced when installing the emi filter on the data clock lines before measure 60 noise level dbμv/m 50 40 before measure 30 20 10 30 84 138 192 246 300 frequency mhz when the emi filter for signal line is mounted to a clock line and the chip ferrite bead inductor is mounted to a dc power supply line chip ferrite bead chip emifil® for signal lines blm18bd102sn1 1000Ω typ at 100mhz nfw31sp107x1e4 cut-off frequency 100mhz 60 7 noise level dbμv/m 50 40 22Ω cpu 30

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 8 c35e.pdf september.5,2013 example of noise suppression for car navigators installing emi filters on the clock lines high frequency clock signals generate high frequency noise noise and signal frequencies may be close to each other therefore an emi filter with high and steep attenuation is used such as the nfw31s series chip emifil® for signal lines or the blm□□b series chip ferrite bead for high-speed signal lines noise caused by transient currents is also generated on the power supply line therefore a chip ferrite bead is installed as well as a by-pass capacitor to suppress noise on the power supply line chip ferrite bead

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 c35e.pdf september.5,2013 example of noise suppression in ac power supplies newer switching power supplies tend to have a high switching frequency that generates high levels of noise noise is especially strong in the several hundred khz frequency range close to the switching frequency the figure below shows an example of measured mains terminal interference voltage in this example noise of 500khz or less frequency is strongly generated when this noise is broken down into common mode and differential mode components it is found that the noise consists mainly of differential mode components newer switching power supplies tend to strongly generate

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 c35e.pdf september.5,2013 10 example of noise suppression in mobile phones base band ic rf chip set rf section 10 46 tcxo lcd panel mobile phone base band section typically the base band ic controls various signals such as voice signal and lcd signal the base band ic is a significant noise source because it operates at a high-speed and connects many data lines if such noise flows into the rf section through the data line or power/gnd line sensitivity suppression occurs resulting in ber bit error rate deterioration ant noise emission status when noise from the base band section flows into rf section sensitivity suppression occurs resulting in ber

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 c35e.pdf