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您好，我正在尝试使用50GHz PNA-X和固定A.09.80.20的28个标准接收器测量下变频器的噪声系数，输入功率为-70dB，输入功率为-70dBm。
端口1上的源衰减为40dB，端口2上的接收器衰减为5dB。 我使用的是1.2MHz的噪声带宽，平均值为250，功率校准为-55dBm。 我无法以更高的功率进行校准，因为我得到了源无法发现的错误。 我正在使用标量噪声系数进行转换器校准和测量。 问题是我几乎整个乐队都得到了负噪声系数值！ 虽然增益虽然和输出功率似乎还可以。 我使用47到49.8GHz作为我的RF范围，使用10.5GHz（四倍）作为我的LO。 如果有人可以告诉我应该尝试什么来解决这个问题，那将非常感激。 谢谢，rok 以上来自于谷歌翻译 以下为原文 Hello, I'm trying to measure the noise figure of a downconverter with ~70dB of gain @ input power of -70dBm using a 50GHz PNA-X and opt 28 standard receivers with firmware A.09.80.20. The source attenuation on Port 1 is 40dB and the receiver attenuation on Port 2 is 5dB. I am using noise bandwidth of 1.2MHz, Averages of 250, and power calibration of -55dBm. I cannot calibrate at a higher power because I get source unleveled errors. I am using the scalar Noise figure for converters calibration and measurement. The problem is that I am getting negative noise figure values for virtually the whole band! The gain though and the output power seems okay though. I am using 47 to 49.8GHz as my RF range and 10.5GHz (quadrupled) as my LO. If someone can advise what I should try in order to fix this, that would be greatly appreciated. Thanks, rok 附件 
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什么是你的FW rev？
您应该首先转到最新的固件。 必须在27 GHz以上非常小心地使用选件028。 接收器使用LO的三次谐波，这意味着它具有更高的内部噪声系数，并且对DUT的任何噪声功率敏感，或者在校准期间输入频率的1/3（在您的情况下约为16.5 GHz） 。 通常，您必须预先过滤乐队中的收音机。 此外，对于选项028，存在一种不在旧单元上的工厂校准。 如果文件丢失，它会在第一次执行NF校准时创建它。 但是，软件需要正常设置（如预设设置），如果您没有处于这种预设状态，有时校准结果会很差。 如果在校准期间端口1和端口2之间存在大量损耗，则尤其如此。 我不确定文件名，我将在星期二检查，但你重命名这个校准文件，预设并执行NF校准，它将重新创建此文件。 对于您的情况，您应该使用普通测试端口电缆的标准配置。 此校准非常慢，并测量Noise Receiver Gain-BW产品。 我们认为这个值非常稳定，因此每个NF校准都不需要这个校准，但是如果在第一次出现时配置不当（高损耗，带限制），那么它可能会导致一些问题。 另一个问题，即几乎更有可能的是，您无法在正在使用的低功率水平下获得准确的功率计校准。 因此，不使用正常校准，而是使用“Cal All”。 这允许您以高功率进行校准，然后自动对高功率的参与者差异进行描述，并使用PNA接收器校准较低的功率水平。 你甚至可以先试试这个。 以上来自于谷歌翻译 以下为原文 What's your FW rev? You should first move to the latest firmware. With Option 028 must be used very carefully above 27 GHz. The reciever uses the third harmonic of the LO and so that means that it has higher internal noise figure and is sensitive to any noise power from the DUT or during calibration that occurse at 1/3 the input frequency (about 16.5 GHz in your case). Normally, you must pre-filter the receveiver in your band. Further, for option 028, there is a kind-of factory calibration that is not on the older units. If the file is missing, it creates it the first time a NF cal is performed. BUT, the software expects a normal setup (like a preset setup) and if you are not in such a preset condition, sometimes the calibration gets poor results. This is especially true if you have a lot of loss between port 1 and port 2 during calibration. I'm not sure of the file name, I'll check on Tuesday, but you rename this cal file, preset and do a NF cal and it will recreate this file. For your case, you should just use standard conf with normal test port cables. This cal is quite slow, and measures the Noise Receiver Gain-BW product. We think this value is quite stable so this cal isn't need for every NF cal, but if there was a poor configuration (highly lossy, band limited, for example) when it first occured, then it can cause some problems. The other issue, which is almost more likely, is that you cannot get an accurate power meter calibraiton at the low power levels you are using. So instead of a normal calibration, use "Cal All". This allows you to do the calibration at a high power, and then automatically charaterize the attenutor difference from the high power, and calibrate the lower power level using the PNA receiver. YOu might even try this first. |
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嗨，我正在使用A.09.80.20固件。 但我会根据您的建议升级到最新的固件。 我应该在DUT输出上放置什么样的滤波器？ （即5至8GHz的带通滤波器或8或9GHz截止频率的低通滤波器？）我使用的安捷伦功率传感器可以测量低至-70dBm和高达50GHz的工作频率。 对于噪声系数上的“Cal All”，您可以说我可以设置功率电平（即-30dBm）而不考虑衰减器设置，然后应用该校准并稍后更改源衰减。 是对的吗？ 此外，如果您可以让我知道特殊校准文件的名称，我将重命名并再次尝试。 谢谢，rokEdited：rok于2014年1月21日下午2:09 以上来自于谷歌翻译 以下为原文 Hi, I'm using A.09.80.20 firmware. But I'll upgrade to the latest firmware per your suggestion. What sort of filter should I put on the DUT output? (i.e. bandpass filter from 5 to 8GHz or lowpass filter with cutoff at 8 or 9GHz?) I am using an Agilent power sensor that can measure down to -70dBm and up to 50GHz operation. For the 'Cal All' on noise figure, you're saying I can just set the power level (i.e. -30dBm) without regard to the attenuator settings and later apply that cal and change the source attenuation later on. Is that right? Also, if you can let me know the name of the special calibration file, I'll rename it and try it again. Thanks, rok Edited by: rok on Jan 21, 2014 2:09 PM |
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> {quote：title = rok写道：} {quote}>嗨，>>>我应该在DUT输出上放置什么样的过滤器？ （即5至8GHz的带通滤波器或8或9GHz截止频率的低通滤波器？）028的带通是最好的。 LPF也将是用户>>我正在使用安捷伦功率传感器，可以测量低至-70dBm和高达50GHz的操作。 >如果不小心，低于-50 dBm，漂移/偏移误差可能会非常大。 >对于噪声系数上的“全部校准”，您说我可以设置功率电平（即-30dBm）而不考虑衰减器设置，然后应用该校准并稍后更改源衰减。 是对的吗？ 不，不完全是，您设置（或多个通道）所需的设置，当您开始校准时，您有机会为校准设置不同的衰减，以及Cal-all中衰减器设置之间的性能差异 通道和测量通道被表征并应用于每个通道的校准集。 在校准后你不能改变衰减器。 >另外，如果您可以让我知道特殊校准文件的名称，我将重命名并再次尝试。 我需要去找出来 以上来自于谷歌翻译 以下为原文 > {quote:title=rok wrote:}{quote} > Hi, > > > What sort of filter should I put on the DUT output? (i.e. bandpass filter from 5 to 8GHz or lowpass filter with cutoff at 8 or 9GHz?) Band pass for 028 is best. LPF will also be userful > > I am using an Agilent power sensor that can measure down to -70dBm and up to 50GHz operation. > Without great care, below -50 dBm the drift/offset errors can be quite large. > For the 'Cal All' on noise figure, you're saying I can just set the power level (i.e. -30dBm) without regard to the attenuator settings and later apply that cal and change the source attenuation later on. Is that right? No, not exactly, you set the (or multiple channels) with your desired setting, when you start cal-all, you have the opportunity to set different attenuation for cal, and the difference in the performance between attenuator settings in the Cal-all channel and measurement channels are characterized and applied to the calsets for each channel. You cannot change the attenuator after the cal. > Also, if you can let me know the name of the special calibration file, I'll rename it and try it again. I need to go find it out |
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脑洞大赛9 发表于 2018-12-12 08:57 嗨Joel博士，我想知道你是否设法找到该特殊文件的名称？ 谢谢你，rok 以上来自于谷歌翻译 以下为原文 Hi Dr Joel, I was wondering whether you manage to find the name of that special file or not? Thank you, rok |
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我相信它是noiseBW.xml，但我还没有在我的盒子上验证它。 你在和我们当地的AE，Daryl一起工作吗？ 我碰巧看到一个类似问题的电子邮件字符串。 以上来自于谷歌翻译 以下为原文 I believe it is noiseBW.xml , but I haven't verified it on my box. Are you working with our local AE, Daryl? I happened to see an email string with a similar issue. |
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脑洞大赛9 发表于 2018-12-12 09:25 嗨乔尔博士，谢谢你的回复。 我会检查出来看看。 我还没有联系过AE，但我当地的AE是J. Nelson和T. Wade。 我确实尝试了使用0 dB源衰减和-15dBm校准功率的校准设置的'Cal All'，现在我得到了正噪声系数测量，尽管结果确实有一些明显的纹波，因为它估计了 测量通道的源衰减变为40dB。 但至少它看起来有点有效。 谢谢，rok 以上来自于谷歌翻译 以下为原文 Hi Dr Joel, Thanks for the reply. I'll check that out and see. I haven't contacted an AE on this yet, but my local AE is J. Nelson and T. Wade. I did try it out with the 'Cal All' using calibration settings of 0 dB source attenuation and -15dBm calibration power, and now I'm getting positive noise figure measurements, although the results do have some noticeable ripple, since it is estimating the changes to a source attenuation of 40dB for the measurement channel. But at least it is looking somewhat valid. Thanks, rok |
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