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这是问题,我想解嵌我的夹具的S参数。
因此,为了得到我的灯具的S参数,我让PCB在DUT侧进行TRL校准以获得夹具。 首先,我对我的VNA进行了电子校准并将状态保存为cset1。 然后我使用TRL PCB进行了TRL校准,并将状态保存为cset2。 然后我使用这两个保存的校准集得到S参数,这是由VNA计算的。 但是,我得到的S参数是错误的。 我的夹具将特征Z0从50Ω传输到10Ω,之前已经过测试。 但在使用ADS测试S参数后,我发现它无法传输50Ω至10Ω。 我使用的VNA是N5227A,我的操作程序如下面的附件。 2.bmp933.1 KB3.bmp922.7 KB4.bmp937.3 KB5.bmp1.2 MB9.bmp738.4 KB10.bmp733.2 KB11.bmp739.8 KB12.bmp1.2 MB 以上来自于谷歌翻译 以下为原文 Here is the problem, I want to de-embed the S-parameters of my fixture. So, to get the S-parameters of my fixture, I made the PCBs to do TRL calibration at the DUT sides for my fixture. First, I e-calibrated my VNA and saved the state as cset1. Then I did the TRL calibration using the TRL PCBs and saved the state as cset2. Then I got the S-parameters using these two saved calsets, which is calculated by VNA. However, the S-parameters I got was wrong. My fixture transfers the characterized Z0 from 50 Ω to 10 Ω and this was tested before. But after testing the S-parameters using ADS, I found that it couldn't transfer 50 Ω to 10 Ω. The VNA I use is N5227A and my operating procedure is as the attachments below. 附件 |
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6个回答
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你说你的夹具将特征阻抗从50欧姆转移到10欧姆。
TRL校准中使用的线路标准的实际阻抗是多少? 它们是50欧姆线还是10欧姆线。 在您发布的套件信息中,它表示50欧姆,但我想也许线路设置为与DUT接口的灯具匹配,10欧姆也是如此? 请检查线路的实际阻抗是多少。 以上来自于谷歌翻译 以下为原文 You say your fixture transfers the characteristic impedance from 50 ohms to 10 ohms. What is the actual impedance of the line standards used in the TRL calibration? Are they 50 ohm lines or 10 ohm lines. In the kit information you posted, it says 50 ohms, but I guess maybe the lines are set to match the fixture at the DUT interface, and so are 10 ohms? Please check what is the real impedance of your lines. |
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是的,我的线路标准的实际阻抗是10欧姆,所以我将我的校准套件中的特征阻抗从50改为10来试试,但它也不能很好地工作。 我现在真的很困惑。 与那些不改变线路特性阻抗的灯具相比,我还需要做些什么来获得灯具的正确S参数? 以上来自于谷歌翻译 以下为原文 Yes, my actual impedance of the line standard is 10 ohms, so I changed the characteristic impedance in my cal kit from 50 to 10 to have a try, but it doesn't work well too. I'm really confused now. Compared to those fixtures which don't change the characteristic impedance of line, what else do I need to do to get the right S-parameters of my fixture? |
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hkzhd888 发表于 2018-9-20 17:47 S参数根据参考阻抗而变化。 您想将它们表示为10欧姆参考或50欧姆参考吗? 也就是说,如果您的DUT实际上是10欧姆输入阻抗,您希望S11为0(参考10)或0.666(参考50欧姆)。 以上来自于谷歌翻译 以下为原文 S-parameters change depending upon the reference impedance. Do you want to express them as a 10 ohm reference or a 50 ohm reference? That is, if your DUT is really 10 ohms input impedance, do you want S11 to be 0 (ref 10 ) or 0.666 (ref 50 ohms). |
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脑洞大赛9 发表于 2018-9-20 17:55 是的,我想将它们表达为10欧姆参考。 如果我的DUT真的是10欧姆输入阻抗,我希望S11为0。 以上来自于谷歌翻译 以下为原文 Yes, I want to express them as a 10 ohm reference. If my DUT is really 10 ohms input impedance, I want S11 to be 0. |
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在这种情况下,您需要将calkit中的参考线阻抗设置为10欧姆(直通和线路),PNA系统参考阻抗设置为10欧姆。 然后,史密斯图表的中心将显示为10欧姆(零反射)。 以上来自于谷歌翻译 以下为原文 In that case, you need to set the reference line impedance in the calkit to be 10 ohms for the thru and the line, and the PNA system reference impedance as 10 ohms. Then the center of the smith chart will show read as 10 ohms (for zero reflection). |
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connector family 还可以是PCB吗?这个没有设置错吧?
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