EMI Filters Used in Military Vehicle Radios

April 7, 2008
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The reliability and compact packages of Vicor Picor modules were key considerations for a Vicor customer in Turkey. The Picor modules are being used to achieve low EMI by reducing switching noise at the converter input, and to reduce the ripple currents at the output of the converter, in multi-band, multi-mode radios designed for use in tactical military vehicles.

The QPI family of active EMI filters provides conducted common-mode (CM) and differential-mode (DM) attenuation from 150 kHz to 30 MHz in the CISPR22 range. The proprietary active filtering circuit provides superior attenuation at low frequencies to comply with EN Class B limits, including PICMG® 3.0 for ATCA boards.

Compared to passive filters, active filtering reduces the volume of the common-mode choke, and allows the use of a low-profile, surface-mount package. This smaller size saves valuable board-space and reduces the height which camn improve airflow in blade applications.

The QPO output ripple attenuator products use proprietary active filtering to reduce power supply output ripple and noise (PARD) over 30 dB from 1 kHz to 500 kHz. QPOs improve transient response, ensure quiet point-of-load regulation and work with most DC-DC converters and switching power supplies. Output regulation is maintained by using remote sensing or the trimmed input of the power supply. Active filtering can also effectively reduce load capacitance by a factor of 10 whilst maintaining comparable transient performance.

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