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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。
With the development of adaptive optics (AO) systems, WFP poses a serious signal integrity (SI) challenge with the inclusion of sophisticated high-speed I / O interfaces and multi-level standard power supplies in wavefront processors Can not effectively solve these problems, the system performance will be seriously affected. In this paper, field-circuit hybrid simulation is used to analyze and simulate the crosstalk between parallel multi-transmission lines in high-speed wave-front processors, the reflection on high-speed transmission channels and the differential signal integrity on high-speed serial links. The results show that crosstalk can be reduced by increasing the spacing and adding short-circuit protection wiring, and the signal reflection can be reduced by the common matching between the terminal and the source. The unbalanced differential line increases the common-mode noise of the high-speed link, and finally the system-level high speed Link simulation and measurement, the transmission speed of 6.25Gb / s, bit error rate of less than 1 × 10-12, to meet system requirements.