Effectively Reduced Radiated Electromagnetic Interference for Emission Source of High-Frequency Signal Circuits Using the Filter

• Main Authors: Pao-Shu Huang, 黃寶樹
• Other Authors: Yuang-Shung Lee
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/44369029146505243380

碩士 === 輔仁大學 === 電子工程學系 === 96 === Now, the high-speed signal of printed circuit board of electronic product usually exceeds 100MHz, moreover, the nonideal behavior of the circuit makes the high-speed signal produce radiated electromagnetic interference (radiated EMI) easily, however, the radiated EMI are mostly coming from higher frequency harmonic of high-speed signal, So this thesis proposes four kinds of different structure EMI filters and then using Pspice to simulate EMI filter’s circuit and using derived transfer function to calculate EMI filter’s parameters, finally, put electronic product into EMI chamber and actually measure radiated EMI, it can prove that radiated EMI produced by high-speed signal can be suppress and enable the electronic product to pass the regulation of EMI (CISPR 22).