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问候,我一直试图通过绕过测试端口的内部耦合器来提高我的N5230C PNA灵敏度。
为实现这一目标,我直接访问了内部微波硬件配置,并通过循环器路由信号。 请参阅附件。 我没有达到更好的灵敏度,但是我的测量质量比简单的1端口测量更差。 如果1端口测量结果具有或多或少的具有一些噪声的平坦迹线,则绕过内部耦合器会导致大量波纹。 我的测量设置中的问题在哪里? 我怎么能改进它? 最好的问候,KA 以上来自于谷歌翻译 以下为原文 Greetings, I have been trying to improve my N5230C PNA sensitivity by bypassing the internal coupler at the test port. To achieve this, I directly accessed the internal microwave hardware configuration and routed the signal through a circulator. Please, see the attachments. I did not achieve better sensitivity, but I made the quality of my measurements even worse than straightforward 1-port measurements. If the 1-port measurement results have a more or less flat trace with some noise, bypassing the internal coupler leads to lots of ripples. Where is the problem in my measurement setup? How could I improve it? Best regards, KA 附件
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2个回答
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看起来很奇怪...通常对于反射测量,噪声基底比方向性地板低约50 dB,所以从来没有真正的问题。
你想测量什么? 在你的实验中,你做过校准吗? 我们需要花费一些精力来配合内置耦合器以获得良好的低纹波效果,因此绕过它可能无法在没有校准的情况下使事情变得更好。 以上来自于谷歌翻译 以下为原文 seems an odd thing to do... normally for a reflection measurement the noise floor is about 50 dB below the directivity floor, so never really an issue. What are you trying to measure? And in your experiment, did you do a calibration ? We take some effort to match everything up with the built-in coupler to get good, low ripple results, so bypassing it might not make things better without a cal. |
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Joel博士我在循环器方面不是很好,但我不认为他们有更好的指令(隔离度约为20dB)作为内部耦合器/电桥(隔离> 25dB)。 这肯定会降低系统的性能。 kauerbach你用过什么力量? 省略内部耦合器后,接收器的电源将增加16dB(不确定PNA耦合器是16还是20dB)。 我不确定端口2到3之间的循环器损耗是多少。我认为它比典型的耦合器低。 如果放置0dBm,您可以在校准期间压缩接收器。 问候。 米雷克 以上来自于谷歌翻译 以下为原文 Dr. Joel I am not that good in circulators, but I do not think that they have better directive (the isolation is about 20dB) as the internal coupler/bridge (isolation >25dB). That definitely will reduce the performance of the system. kauerbach What power did you used? Once you omit internal coupler you power to receiver will increas by at list 16dB (not sure if the PNA coupler is 16 or 20dB). I am not sure what is the loss of circulator between port 2 to 3. I will assume it is lower then typical coupler. You may compress the receiver during the calibration if you put like 0dBm. Regards. Mirek |
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