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EMI filter passes only good vibrations
By Bill Schweber -- EDN, 4/1/2004
The KNA21 Series of EMI filters from AVX/Kyocera lets you suppress noise generated by high-speed digital lines. You can tuck these multilayer, 2×1.25×0.85-mm devices into tight spaces, such as cell phones, and keep RF noise from LCD and camera lines from the sensitive RF section, for example (Picture).
Depending on model, these devices protect as many as four lines. The filters provide cutoff frequency of 400 MHz and attenuation range of 800 to 2500 MHz at 15 dB and 800 to 1000 MHz at 20 dB. Prices for this EMI filter start at 30 cents (production quantities).
AVX Corp, www.avxcorp.com.
