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现在我正在使用S21触摸石头文件测试眼图模拟。 我的目标数据速率是20Gbps。 但我发现我的S21文件的结果高达15GHz。 如您所知,当我们想要20Gbps的眼图模拟时,S21结果应该具有频率高达30GHz(目标数据速率的3次谐波,3 * 10GHz)的结果即使我的文件只有高达15GHz的结果,模拟完成 有一些结果。 (也许是不完美的结果)那么,我想知道ADS使用什么样的算法来补偿那些信息不足(频率从15GHz的S21)ADS是否假设高于15GHz的频率的每个S21值都是15GHz的相同值? 或者ADS是否使用一些特殊算法来弥补S21信息的不足? 非常感谢。 以上来自于谷歌翻译 以下为原文 Hi. Nowadays I am testing Eye-diagram simulation using S21 touch stone file. My target data rate is 20Gbps. But I've found that my S21 file has the result upto 15GHz. As you know, S21 result should have the result of frequency upto 30GHz(3rd HARMonics of the target data rate, 3*10GHz) when we want to to 20Gbps Eye-diagram simulation Even though my file has the result only upto 15GHz, simulation completed with some result. (Maybe imperfect Result) So, I wonder what kind of algorithm ADS is using to compensate those lack of information (S21 of frequency from 15GHz) Does ADS assume that every S21 value of frequency which is higher than 15GHz is the same value of 15GHz? Or does ADS use some special algorithm to compensate the lack of S21 information? Thanks a lot. |
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2个回答
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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 以上来自于谷歌翻译 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 |
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