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嗨,我正在使用4端口N5224A进行差分测量。
我需要将SP10T多端口swithces连接到我的每个测试端口。 每个开关的一条路径都打开,然后我用N4692A执行一个完整的4端口校准。 当我执行传输测量时,单端传输测试数据似乎正常,但SDD12不是附加的。 我无法弄清楚发生了什么。 因此,我从测试端口移除了所有开关,再次使用N4692A执行完整的4端口校准,并测量传输,这次单端和差分参数(SDD12)都正常。 似乎开关影响了我的差分测量,但我无法解释原因。 你有什么建议吗? 谢谢。 SN 以上来自于谷歌翻译 以下为原文 Hi, I am doing differential measurement with a 4-port N5224A. I need to connect a SP10T multiport swithces to each of my test port. One path of every switches is turned on, then I perform a full 4-port cal with N4692A. When I perform a transmission measurement, the single ended transmission test data seems normal but the SDD12 is not, as attached. I can't figure out what happen. So I removed all the switches from my test ports, do a full 4-port cal again with N4692A, and measure transmission, this time both single-ended and differential parameter (SDD12) are normal. Seems like the switches affected my differential measurement, but I can't explain why. Do you have any advice for me? Thank you. SN 附件
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1个回答
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在连接开关的情况下查看各个传输参数的相位。
我怀疑你可能会看到数据中的相位反转。 Sdd21只是4个S参数的向量和,所以如果它显示不好,它必须来自底层的单端S参数。 如果您使用ecal,默认情况下它使用未知的直通校准。 通过未知通过你必须知道+ -90度未知通过的阶段。 通常情况下,Ecal处理这个问题没有问题,但我想知道交换机的不匹配是否会使Ecal默认估计混乱。 您可以尝试为ecal选择“修改cal:更改校准方法”,然后选择“Ecal as defined thru”而不是“Ecal as unknown thru”。 看看是否能解决问题。 以上来自于谷歌翻译 以下为原文 Look at the phase of the individual transmission parameters with your switch attached. I suspect you might see a phase reversal in that data. Sdd21 is just the vector sum of 4 S-parameters, and so if it shows bad, it must be from the underlying single-ended S-parameters. If you use an ecal, by default it uses unknown thru calibrations. With unknown thru you have to know withing +-90 degrees the phase of the unknown thru. Normally the Ecal handles this with no problem, but I wonder if bad mismatch from the switch is making confusing the Ecal default thru estimate. You can try to select "modify cal: change cal methods" for ecal and then select "Ecal as defined thru" instead of "Ecal as unknown thru". See if that fixes the issue. |
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