防護線減小微帶線間串擾的FDTD分析
FDTD Analysis of the Crosstalk Reduction with Guard Trace Between Microstrips
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摘要: 隨著信號轉(zhuǎn)換速度日益提高，高速電路設(shè)計中的串擾問題也日趨嚴重。該文分析了使用防護線減小PCB微帶線間串擾的效果，并運用FDTD對長耦合微帶線進行了仿真驗證。仿真結(jié)果表明，只要：(1) 添加有接地過孔的防護線并使過孔間距小于信號在RT/2(RT：傳輸信號的上升時間)時段內(nèi)的傳輸距離；(2) 在滿足線間距布線規(guī)則的前提下，將防護線適當加寬而又維持三條線(防護線和兩條微帶線)中兩兩之間的中心距不變，就能夠有效減小線間的遠端和近端串擾。
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關(guān)鍵詞:
- 微帶線;串擾;防護線;FDTD
Abstract: As the velocity of signal switch becoming fast, the crosstalk in high-speed circuit design is becoming worse than ever. The performance of guard traces in reducing the crosstalk between microstrips is analyzed and simulated with FDTD method in this paper. The simulation results show that the far-end and near-end crosstalks are reduced largely and efficiently by the following useful measures: (1) The guard trace with several grounded vias should be inserted between microstrips and the distance between two adjacent vias should be less than propagating distance during RT/2, the half rising time of signal. (2) By obeying the smallest side-to-side distance routing rule and keeping the center-to-center distances between arbitrary two of three lines (microstrips and the guard trace) constant, the guard trace inserted should be as wide as possible. -
Johnson Howard, Graham Martin. High-Speed Digital Design. USA, Prentice Hall PTR, 1993: 189.211.[2]劉博, 陳如山. 降低耦合微帶線間串擾問題FDTD分析. 微波學(xué)報, 2003, 19(3): 7.9.[3]Xu J, Zhao A P, Raisanen A V. A stable algorithm for modeling lumped circuit source across multiple FDTD cells[J].IEEE Microwave Guided Wave Letters.1997, 7(9):308-[4]Bogatin Eric. Signal Integrity-Simplified. USA, Prentice Hall PTR, 2003: 401.408.葛德彪, 閆玉波. 電磁波時域有限差分方法. 西安, 西安電子科技大學(xué)出版社, 2003: 8.49. -
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