This application note describes the background, technique andresults of EMI measurements on the PCK2001 (CKBF), showingreduced EMI emissions over standard design techniques. Throughthe use of circuit design, the high frequency EMI emissions from theCKBF were reduced from a standard design approach. Thesereduced emissions should help a board/systems manufacturer passFCC and CISPR EMI requirements.BACKGROUND OF EMI, FCC AND CISPRSTANDARDSEMI, Electro-Magnetic Interference, is any unwantedelectromagnetic signal which may degrade the performance of anelectronic device. It is generally thought of as one device creatingelectromagnetic radiation that interferes with the operation orperformance of another device. PCs and PC motherboard designshave to meet standards set by regulatory agencies. Two standardsare, FCC (Federal Communications Commission) regulations part15B, and International Electrotechnical Commission’s InternationalSpecial Committee on Radio Interference (CISPR) 22B. Theseregulations specify limits: