Composite chips for efficient EMI/RFI filtering

Microelectronics International

ISSN: 1356-5362

Article publication date: 1 August 1999




(1999), "Composite chips for efficient EMI/RFI filtering", Microelectronics International, Vol. 16 No. 2.



Emerald Group Publishing Limited

Copyright © 1999, MCB UP Limited

Composite chips for efficient EMI/RFI filtering

Composite chips for efficient EMI/RFI filtering

Keywords BI Technologies, Chips, Filters

A new range of inductor/capacitor EMI/RFI chip filters, which incorporate ceramic and ferrite composite construction technology for superior performance, has been introduced by BI Technologies. Designed to filter out unwanted frequencies effectively and efficiently in a broad range of applications, the LC series chips are manufactured in both 0805 and 1206 standard sizes. They are ideal for use in digital communications and AV equipment, LAN, WAN, serial bus and graphics cards, on-board controllers, computers and peripherals.

Each LC chip incorporates four inductors and three capacitors which are connected in a ladder network configuration to provide accurate and reliable EMI/RFI filtering performance on a single monolithic chip. The cut-off frequencies available in both chip sizes are 10MHz, 22MHz, 47MHz and 100MHz, with an additional 220MHz device available in the 0805 size.

The chip's integrated passive ladder construction is superior to discrete solutions at high frequencies due to very short internal connections. It also offers greater attenuation beyond the cut-off point compared to "T" styles. In addition, insertion loss characteristics are steeper and noise attenuation greater than with other types of filter.

For further information, please contact BI Technologies Ltd, 7 Westleigh Park, Blaby, Leicester LE8 4EZ. Tel: +44 (0)116 278 1133; Fax: +44 (0)116 278 1199.

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