高速波前处理机中信号完整性分析

Signal Integrity Analysis of High-speed Wavefront Processor

摘要:

随着自适应光学(AO)系统的发展，波前处理机(WFP)中包含了复杂的高速I/O接口和多电平标准供电，使得WFP面临严重的信号完整性(SI)挑战，若不能有效解决这些问题，系统性能将会受到严重影响。文章使用场路混合仿真方法对高速波前处理机中并行多传输线间的串扰、高速传输通道上的反射及高速串行链路上的差分信号完整性问题进行了分析与仿真。结果表明通过增大间距与增加短路防护布线可有效降低串扰，通过终端与源端共同匹配的方式可减少信号反射，差分线不平衡会增加高速链路的共模噪声，最后进行了系统级高速链路仿真与实测，传输速度达6.25Gb/s，误码率低于1×10-12，满足系统要求。

Abstract:

The high-speed wavefront processor(HS-WFP) is the core of the adaptive optics (AO)system, so any adverse effect on the signal will make the system failure. Hybrid Field-Circuit approach which incorporates 3D full-wave EM and system simulation was proposed to analyze the impacts of crosstalk between the multi-transmission lines, reflection on the high-speed transmission channels, and the integrity of differential signal in HS-WFP. The results show that increasing the spacing and adding short-circuit protection wirings can effectively reduce the crosstalk, the terminal and source-side match can reduce signal reflections, and differential line imbalance will increase the common mode noise of the high-speed link. The system-level high-speed link simulations were carried out, and it shows that the transmission speed is up to 6.25Gb/s and the error rate is less than 1×10-12, completely meeting the system requirements.