touchstone文件的S21结果不足时的眼图模拟

S参数模拟将默认为恒定外推，但是，在瞬态和通道模拟器中，ADS使用基于希尔伯特变换和Kramer's-Kronig关系强制执行的专利因果变换。
模拟消息还提供有关每个S参数块的时域仿真中使用的带宽的信息。
我建议看一下关于该主题的以下DesignCon论文，然后尝试将S-Parameter带宽限制到更小的带宽，以查看对设计的相对影响。
较低的带宽基本上是低通滤波器，但如果通道已经有其他组件减慢了边沿速率，则可能不会产生重大影响，1.5 x奈奎斯特可能仍然足够。
http://literature.cdn.keysight.com/litweb/pdf/5991-4084EN.pdf?id=2440386查看“夹具设计分析”部分。
http://www.te.com/documentation/electrical-models/files/papers/DC2008_CM2.pdf问候，Heidi



     以下为原文

  The S-parameter simulation will default to constant extrapolation, however, in the Transient and Channel Simulators ADS uses a patented causal transformation based on the Hilbert transform and enforcement of the Kramer's-Kronig relationship. The simulation messages also provides information on the bandwidth used in the time domain simulation for each of the S-Parameter blocks.  I would suggest taking a look at the following DesignCon papers on the topic and then experiment with bandlimiting the S-Parameter to even smaller bandwidths to see the relative impact on your design.  A lower bandwidth is basically a low pass filter, but if the channel already has other components slowing down the edge rate it may not be a significant impact and 1.5 x Nyquist might still be sufficient.  

http://literature.cdn.keysight.com/litweb/pdf/5991-4084EN.pdf?id=2440386  Look in the Fixture Design Analysis section.

http://www.te.com/documentation/electrical-models/files/papers/DC2008_CM2.pdf

Regards,
Heidi