Composite chips for efficient EMI/RFI filtering
16 Feb 2000
Circuit & System Protection
Avnet Kopp
A range of inductor/capacitor EMI/RFI chip filters which incorporates ceramic and ferrite composite construction technology for superior perform- ance, 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 suited 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 10 MHz, 22 MHz, 47 MHz and 100 MHz, with an additional 220 MHz 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.
The LC series chips complement BI’s existing range of ferrite beads, wound surface mount inductors, RC chips and RC networks and the company is committed to the continued development of integrated passive products which can provide effective solutions for filtering requirements and minimise component counts on PCBs.
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