發明
美國
14/993,280
US 9,918,379 B2
Circuit board
中原大學
2018/03/13
本研究主要探討在差模訊號線相鄰接地防護線與接地平面時之共模雜訊生成。設計準則與減少方案提出了建議。要明確的區分,因此每個結構分為兩部分,第一個是差模訊號線相鄰接地防護線連接接地平面,另外一個結構是差模訊號線相鄰一條接地防護線與接地平面。在另一方面,差模訊號線相鄰一接地防護線連接接地平面。 共模雜訊生成機制與減少方案研究了兩種結構,此外,用不同的設計方案研究以驗證共模雜訊生成機制與減少方案的有效性。由於所述之生成機制與減少方案的分析,共模雜訊的減少設計方式被提出。 兩種減少方案中,藉由不適當的設計,時域之下共模雜訊的峰對峰值分別為92%與94%。此外,頻域之下差模轉共模的減少幅度(|Scd21|)於0GHz~6GHz的頻率範圍內,共振峰值超出了35dB。 最後,模擬與實驗結果之間的比較有利地印證了提出的共模雜訊減少方案(設計準則)中之減少共模雜訊的性能。 In the other, differential traces adjacent to one ground line were connected to a ground plane. The CMN generation mechanisms and reduction schemes are studied in the two structures. In addition, the test structure with different designs cases is also investigated to verify the effectiveness of the CMN generation mechanisms and reduction schemes. Based on the analysis of the generation mechanisms and reduction schemes, design guidelines for CMN reduction are proposed. In both reduction schemes, peak-to-peak CMN amplitudes in the time domain were 92% and 94% of those obtained by unsuitable designs, respectively. Moreover, in the frequency domain, the reductions in the magnitude of differential-to-common mode conversion (|Scd21|) at the resonant peaks exceeded 35dB in the frequency range 0GHz~6GHz. Finally, a favorable comparison between simulated and measured results confirms the excellent CMN reduction performance of the proposed reduction schemes (design guidelines).
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