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頁籤選單縮合
題名 | Experimental Study of IC EMI Reduction Using Spread-Spectrum Clocks=使用展頻時脈降低IC EMI之實驗研究 |
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作者 | 黃崇豪; 林明星; 何前程; 蕭國祥; 許崇宜; Huang, Chuang-hao; Lin, Ming-shing; Ho, Chian C.; Hsiao, Kuo-hsiang; Hsu, G. Chung-i; |
期刊 | 中正嶺學報 |
出版日期 | 20101100 |
卷期 | 39:2(A) 2010.11[民99.11] |
頁次 | 頁87-91 |
分類號 | 448.533 |
語文 | eng |
關鍵詞 | 電磁干擾; 展頻技術; 展頻時脈; Electromagnetic interference; EMI; Spread-spectrum technology; Spread-spectrum clock; |
中文摘要 | 時脈(Clock)電路為積體電路的主要電磁干擾(EMI)來源,本文利用展頻技術來調變時脈,期能有效抑制來自於時脈系統的電磁干擾(EMI)。本研究以內建FM三角波調變函數之德州儀器公司的TI CDCE906 時脈合成器當作展頻時脈產生器(Spread-Spectrum Clock Generator; SSCG),並以橫向電磁波室(TEM cell)來評估展頻時脈產生器激發螺旋天線的輻射放射。當一般時脈被頻頻率調變且其上升/下降時間被延長時,量測結果證實螺旋天線的放射準位確實能被大大地降低。 |
英文摘要 | In this study, a spread spectrum technique was employed to modulate clocks so as to reduce the electromagnetic interference (EMI) owing to clocking circuits, which have been considered as major sources of EMI from an IC. A TI-offered evaluation board containing a TI CDCE906 clock synthesizer with a built-in FM triangular modulating function was used as a spread-spectrum clock generator (SSCG). A TEM cell was used to evaluate the radiated emission from a spiral antenna excited by the SSCG. With the clock frequency-modulated and the rise/fall time extended, measured results revealed that the emission levels of the spiral antenna can be greatly reduced. |
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