> {quote：title = RinC写道：} {quote}>在图片中，我没有接触连接到EM模型的S2P数据块。
这是你的意思吗？
如果是这样，不幸的是它不起作用。
这是相同的。
我也尝试在理想的原理图模拟中删除。
我的观点是Momentum SMD端口无法连接任意S2P块。
它们仅为没有分流路径的纯系列元素提供正确的结果。
不确定安捷伦在介绍这种SMD端口实现时的想法......当然，一般来说，S2P模块的接地路径必须正确连接（当然不是浮动的）。
我只建议删除它作为测试，看看这是否导致你看到的差异。
>而且，我的另外一个问题是：作为您的解释，它仅适用于差分端口的引脚组，因此如果我不使用SMD校准端口，如何模拟集中元素在动量中的影响？
我建议远离SMD和Delta Gap端口。
通过强制用户将引脚分组到一个差分端口=>全局接地访问丢失=>这有效地断开（浮动）您连接的S2P数据中的任何分流路径，两者都有缺陷。
您可以禁用端口校准，或使用零长度TML校准，而不是将这些差分端口与SMD校准一起使用。
然后你的端口应该引用全局接地（不要将引脚分组到差分端口！）现在从你的回答中，我知道差异有其他原因，在你的情况下。
显然，这可能是布局寄生效应造成的差异（焊盘电容接地）。
要进一步解决这个问题，如果你可以上传你的项目（使用文件>存档项目压缩它）将有所帮助编辑：volker_muehlhaus于2014年5月20日上午9:12
以上来自于谷歌翻译
以下为原文
> {quote:title=RinC wrote:}{quote}
> In the picture, i ungrounded the S2P data blocks which are connected to EM model. Was that your point? If so, unfortunately it doesnt work. It is the same. I also try to removed in the ideal schematic simulation.
My point was that Momentum SMD ports are not valid to connect arbitrary S2P blocks. They only give correct results for pure series elements that have no shunt path. Not sure what Agilent was thinking when they introduced this SMD port implementation ...
In general, of course, the ground path of S2P blocks must be properly connected (not floating, of course). I only suggested to remove it as a test, to see if this is causing the difference that you see.
> And, my additional question is: as your explanation, it only works for groups of pin at differential ports, so how can i simulate the effect of Lumped elements in Momentum if i don't use SMD calibration port?
I would suggest to stay away from SMD and Delta Gap ports. Both are flawed by forcing the user to group pins to one differential port => loss of global ground access => this effectively disconnects (floats) any shunt path in the S2P data that you connect. Instead of using these differential ports with SMD cal, you could either disable port calibration, or use the zero length TML calibration. Your ports should then reference the global ground (do not group pins to differential ports!)
Now from your answer, I understand that the difference has other reasons, in your case. Obviously, it could be the layout parasitics that are causing the difference here (pad capacitance to ground). To troubleshoot this further, it would help if you could upload your project (zip it by using File > Archive Project)
Edited by: volker_muehlhaus on May 20, 2014 9:12 AM
> {quote：title = RinC写道：} {quote}>在图片中，我没有接触连接到EM模型的S2P数据块。
这是你的意思吗？
如果是这样，不幸的是它不起作用。
这是相同的。
我也尝试在理想的原理图模拟中删除。
我的观点是Momentum SMD端口无法连接任意S2P块。
它们仅为没有分流路径的纯系列元素提供正确的结果。
不确定安捷伦在介绍这种SMD端口实现时的想法......当然，一般来说，S2P模块的接地路径必须正确连接（当然不是浮动的）。
我只建议删除它作为测试，看看这是否导致你看到的差异。
>而且，我的另外一个问题是：作为您的解释，它仅适用于差分端口的引脚组，因此如果我不使用SMD校准端口，如何模拟集中元素在动量中的影响？
我建议远离SMD和Delta Gap端口。
通过强制用户将引脚分组到一个差分端口=>全局接地访问丢失=>这有效地断开（浮动）您连接的S2P数据中的任何分流路径，两者都有缺陷。
您可以禁用端口校准，或使用零长度TML校准，而不是将这些差分端口与SMD校准一起使用。
然后你的端口应该引用全局接地（不要将引脚分组到差分端口！）现在从你的回答中，我知道差异有其他原因，在你的情况下。
显然，这可能是布局寄生效应造成的差异（焊盘电容接地）。
要进一步解决这个问题，如果你可以上传你的项目（使用文件>存档项目压缩它）将有所帮助编辑：volker_muehlhaus于2014年5月20日上午9:12
以上来自于谷歌翻译
以下为原文
> {quote:title=RinC wrote:}{quote}
> In the picture, i ungrounded the S2P data blocks which are connected to EM model. Was that your point? If so, unfortunately it doesnt work. It is the same. I also try to removed in the ideal schematic simulation.
My point was that Momentum SMD ports are not valid to connect arbitrary S2P blocks. They only give correct results for pure series elements that have no shunt path. Not sure what Agilent was thinking when they introduced this SMD port implementation ...
In general, of course, the ground path of S2P blocks must be properly connected (not floating, of course). I only suggested to remove it as a test, to see if this is causing the difference that you see.
> And, my additional question is: as your explanation, it only works for groups of pin at differential ports, so how can i simulate the effect of Lumped elements in Momentum if i don't use SMD calibration port?
I would suggest to stay away from SMD and Delta Gap ports. Both are flawed by forcing the user to group pins to one differential port => loss of global ground access => this effectively disconnects (floats) any shunt path in the S2P data that you connect. Instead of using these differential ports with SMD cal, you could either disable port calibration, or use the zero length TML calibration. Your ports should then reference the global ground (do not group pins to differential ports!)
Now from your answer, I understand that the difference has other reasons, in your case. Obviously, it could be the layout parasitics that are causing the difference here (pad capacitance to ground). To troubleshoot this further, it would help if you could upload your project (zip it by using File > Archive Project)
Edited by: volker_muehlhaus on May 20, 2014 9:12 AM
举报
