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您好,我有一个信号发生器,我想将10MHz Ref Out连接到3个不同硬件(2个SpecAns和我的DUT)的3个10MHz参考输入。
我的基本问题是,我该怎么做? 使用阻抗匹配的功率分配器或简单的三通或者这是不推荐的? 我觉得使用分离器可能会导致相位问题,因为它在输入和输出之间有几度的相位差。 关于设置的更多信息:我正在处理一个内置VXI SigGen和SpecAn的测试站。来自SigGen的10MHz Ref已经通过一个简单的T形接口提供SpecAn 10MHz输入并提供对10MHz参考的访问权限 前面板。 我想在前面板上使用该连接将此引用输入到外部辅助SpecAn以及DUT。 我希望通过外部SpecAn避免菊花链接,因为它需要我的接口设备上的额外连接器。 我担心力量不够。 规格如下:SigGen输出> 0dBm,内部SpecAn输入> -3dBm,外部SpecAn输入> 0dBm,DUT> -5dBm。 一次只能使用一个SpecAn; 但是,内部电源将始终通电并连接。 非常感谢任何帮助或建议。 谢谢,J 以上来自于谷歌翻译 以下为原文 Hello, I have a signal generator and I would like to connect the 10MHz Ref Out of it to 3 10MHz Ref Inputs of 3 different pieces of hardware (2 SpecAns and the my DUT). My basic question is, how would I do this? Using an impedance matched power splitter or a simple tee or is this just not recommended? I feel using the splitter may cause phase issues since it has a few degree phase difference between input and output. A little more about the setup: Im dealing with a test station that has a VXI SigGen and SpecAn built in. The 10MHz Ref from the SigGen already goes through a simple tee to feed the SpecAn 10MHz input and give access to to the 10MHz ref at the front panel. I want to use that connection at the front panel to input this reference to an external auxiliary SpecAn and also to the DUT. I was hoping to avoid daisy chaining through the external SpecAn because it would require an additional connector on my interface device. I'm worried the power will not be sufficient. The specifications are as follows:The SigGen output is >0dBm, the interal SpecAn input is >-3dBm, the external SpecAn input is >0dBm, and the DUT is >-5dBm. Only one SpecAn will be used at a time; however, the internal one will always be powered on and connected. Any help or advise is greatly appreciated. Thanks, J |
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嗨Jluke,我大多使用BNC T型连接器连接参考信号而不用担心相位。
只要仪器(和DUT)锁定到相同的参考,并且水平在规格范围内就可以了。 如果您同时具有输入和输出,也可以将它们串联连接。 如果您具有相位关键设置,则可以使用相位检测器(混频器)和示波器测量发生器输出的相位差,但您最终可能需要另外一个源作为“相位参考”。 然后可以将直流信号馈送到相位调制输入,以调整输出相位,甚至可以使用相位检测器和低通滤波器(环路滤波器)对其进行相位锁定。 一些发电机有可能调整输出相位。 以上来自于谷歌翻译 以下为原文 Hi Jluke, I have mostly connected the reference signal using BNC T-connectors without worrying about the phase. As long as the instruments (and DUT) are locked to the same reference and levels are within spec it's fine. You can also connect them in series if you have both input and outputs. If you have a phase critical setup, it's possible to measure the phase difference at the generator outputs using a phase detector (mixer) and an oscilloscope but you may end up needing one more source as "phase reference". It is then possible to feed a DC signal to the phase modulation input to adjust the output phase or even phase lock it with your phase detector and a low pass filter (loop filter). Some generators have a possibility to adjust the output phase. |
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