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嗨,我在PCB上制作了一个TRL-kit。
不幸的是,sma连接器脚印会降低连接器-cb转换的回波损耗,降低到约。 -15dB。 是否有一个关于TRL套件返回损失有多好以便工作的经验法则? 我想必须有某种限制? sma连接器内部的线路是50欧姆线。 以上来自于谷歌翻译 以下为原文 Hi, I have fabricated a TRL-kit on PCB. Unfortunately, the sma connector foot print degrades the return loss of the connector-pcb transistion down to approx. -15dB. Is there a rule-of-thumb on how good the return loss of a TRL kit need to be in order to work? I guess there has to be some sort of limit? The lines inside the sma connectors are good 50ohm lines. |
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3个回答
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对于第一个订单,TRL校准的质量由SMA连接器或Z线的较差者精确设定;
根据您使用的SMA连接器的质量,它与35欧姆至65欧姆的线路阻抗变化相同。 所以,在这种情况下,你可以更好地校准3.5毫米和自动端口扩展。编辑:Dr_joel于2013年12月16日下午2:52 以上来自于谷歌翻译 以下为原文 To the first order, the quality of a TRL cal is exactly set by the poorer of the SMA connector or the line Z; with the quality of the SMA connectors you use, it is the same as having a line impedance variation on the order of 35 ohms to 65 ohms. So, in this case, you are likley much better off to calibrate in 3.5 mm and auto-port extend. Edited by: Dr_joel on Dec 16, 2013 2:52 PM |
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脑洞大赛9 发表于 2018-11-19 11:30 事实上,我应该说“SMA连接器的可重复性”。 因此,回波损耗根本不重要,只是不同标准上两个不同SMA连接器之间回波损耗的共性稳定性。 SOLT PCB校准套件也是如此。 以上来自于谷歌翻译 以下为原文 In fact, I should have said the "repeatability of the SMA connector". So the return loss is not important at all, only the stabilty of commonality of the return loss between two different SMA connectors on the different standards. This is also true for SOLT PCB cal kits. |
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脑洞大赛9 发表于 2018-11-19 11:39 因此,如果SMA连接器在不同TRL标准上的可重复性良好,那么它可以吗? 即使回波损耗真的很差,比如-5dB,是否仍然可以通过校准消除连接器的影响(假设线路正常,而且不匹配来自sma-pcb转换)? 转过身来; 如果假设sma-pcb转换是好的,但是直通和延迟不是50欧姆而是其他东西,那么校准是否最终会出错? 以上来自于谷歌翻译 以下为原文 So if the repeatability of the SMA connectors on the different TRL standards are good, then it is ok? Even if the return loss would have been really bad, say -5dB, would it still be possible to remove the impact of the connectors (assuming the lines would be ok, and the mismatch came from the sma-pcb transition) by calibration? Turning it around; if the sma-pcb transition is assumed good, but the thru and delay wouldn't be 50ohm but something else, would the calibration then end up being wrong? |
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