挠性印制板拐角防撕裂结构信号传输性能分析

Signal performance analysis of corner anti-tear structures on FPC

印制电路板的不连续问题已成为当今高速数字设计研究的重点。随着频率的增长和信号上升沿的变陡,挠性印制板拐角带来的阻抗不连续会引起信号的反射,严重影响系统的性能和信号完整性。由于挠性印制板很容易在大应力的作用下造成开裂或断裂,在设计时常在拐角处采用抗撕裂结构设计以更好的改善FPC的抗撕裂的性能。文章基于三维电磁场仿真软件HFSS,对挠性印制板多种圆弧拐角仿撕裂结构进行了研究。通过建立三维物理模型,分析了多种圆弧拐角防撕裂结构对高速电路的信号完整性的影响。

Research on discontinuity in PCB has became the emphasis in modem high-speed digital designs. As frequency increases and signal rise time reduces, FPC comers causes impedance discontinuities resulting in signal reflections and hence deterioration of signal integrity and system performance. As the FPC easily cracking or fracture under the influence of large stresses, in developing a design, regular using anti-tear structurals around the comer to better improve the anti-tear performance of FPC. The paper carries out a comprehensive study of various FPC comers anti-tear structures using a full-wave electromagnetic simulator HFSS. The impact of multiple arc comers anti-tear structures on SI was analyzed by modeling and simulation.