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EMI filters: recommendations and measurements

Posted: 17 Jun 2009 ?? ?Print Version ?Bookmark and Share

Keywords:EMI filter? ESD? interference? recommendation EMI?

With the development of wireless telecommunications, consumer products and cellphones are subjected to RF interference (RFI) and may generate EMI. This is in addition to ESD that the user can apply when touching a connector like a bottom connector on a cellphone.

In the past, filtering was achieved by discrete devices (capacitors, resistors), and ESD protection was done by discrete diodes. Cellphone size drop and enhanced features require faster signals and more and more integrated devices, which are becoming very sensitive to ESD or EMI/RFI. Discrete devices impose a well designed layout to minimize parasitic effect of PCB inductances while Integrated Passive and Active Devices suppress most of these inductances due to very short tracks between passives on the die itself.

Discrete filter will behave like a rejection filter but the rejection frequency will be depending on parasitic inductances, while the IPAD filter will act like a low pass filter. EMIF filters have three main functions: the first is of course to filter EMI/RFI, the second is to protect inputs and outputs against ESD, and the third one is to transmit data from inputs to outputs. The application note aims to explain test conditions for EMIF devices.

View the PDF document for more information.

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