PNA-X 67GHz噪声系数选项29与选项28相比

> {quote：title = rok写道：} {quote}> Opt 29允许您使用噪声接收器路径（最高50GHz）或标准NA端口（最高67GHz）执行噪声系数。
您不必安装Opt 29和28，因为Opt 29包含Opt 28的所有功能。>是的，这是真的。
>在重叠区域（即从45到55GHz测试）的情况下，当选择噪声接收器路径时，PNA-X将使用45到50GHz的噪声接收器路径，并使用50到55GHz的标准接收器路径。
>当您设置跨越50 GHz边界的测量并且您选择了噪声接收器时，PNA-X将简单地过扫描噪声接收器。
噪声接收器和跨越边界的标准NA接收器之间没有智能切换。
当然要实现的是噪声接收器没有指定在50 GHz以上，50以上没有工厂校准，并且可能有50以上的可怕噪声系数。但是，理论上你可以用功率传感器校准这个设置
超过50 GHz。
>当校准重叠区域情况（即从45到55GHz测试）时，PNA-X校准向导将使用45至50GHz的噪声接收器校准部分和50至55GHz的标准接收器噪声校准。
>不 - 正如我上面提到的，没有转换。
你要么使用噪音接收器，要么使用NA接收器。
我们只是允许过扫描噪声接收器（不保证性能）。



     以下为原文

  > {quote:title=rok wrote:}{quote}
> Opt 29 allows you to perform the noise figure using either the Noise Receiver Path (up to 50GHz) or the Standard NA Ports (up to 67GHz). You do not have to have both Opt 29 and 28 installed, since Opt 29 contains all the functionality of Opt 28. 
> 

Yes that is true.

> In the case of overlapping regions, (i.e. testing from 45 to 55GHz), when selecting the noise receiver path, the PNA-X will use the Noise receiver path from 45 to 50GHz and use the standard receiver path from 50 to 55GHz. 
> 

When you setup a measurement that crosses the 50 GHz boundary and you had selected the noise receiver the PNA-X will simply over-sweep the noise receiver.  There is no smart switching between the noise receiver and the standard NA receiver across the boundary.  the thing to realize of course is that the noise receiver is not specified above 50 GHz, there is no factory cal for it above 50, and it may have terrible noise figure above 50.  However, you could theoretically calibrate this setup with a power sensor that goes above 50 GHz.  

> When calibrating an overlapping region case  (i.e. testing from 45 to 55GHz), the PNA-X calibration wizard will utilize the noise receiver calibration portion from 45 to 50GHz and the standard receiver noise cal from 50 to 55GHz.
> 

no - as I mentioned above, there is no switching.  you either use the noise receiver or the NA receiver.  we simply allow over-sweeping of the noise receiver (with no guarantees of performance).

嗨，谢谢你的回复和澄清。
因此，由于不涉及切换，那么对于那些重叠情况，为了使用可用的，可以为噪声接收器路径设置从45到50GHz的1个NF测量信道，然后使用标准接收器设置另一个NF测量50到55GHz
然后将结果“拼接”在一起以获得45到55GHz的NF行为。
现在假设我们通过噪声接收器路径运行超过50GHz。
前置放大器是否适用于50GHz以上的频率。
如果是这样的话，它的行为是否也会超出这个限制？
在噪声接收器路径中，同样适用于超过50GHz的IF滤波器组吗？
操作PNA-X噪声接收器路径模式超过50GHz是否有任何损坏风险？
谢谢，rok编辑：rok于2014年7月23日下午7:44



     以下为原文

  Hi,

Thanks for the reply and clarification. So since there is no switching involved, then for those overlap cases, in order to use what is available, one would setup 1 NF measurement channel from 45 to 50GHz for the noise receiver pathway and then another NF measurement 50 to 55GHz using the standard receivers and then 'stitch' the results together to get the 45 to 55GHz NF behavior.

Now suppose we do operate beyond 50GHz via the noise receiver pathway. Will the pre-amplifier be applied for those frequencies beyond 50GHz. And if so, would its behavior also be unknown beyond that limit? And would the same apply for the IF filter bank beyond 50GHz in the noise receiver pathway? Is there any risk of damage in operating the PNA-X Noise receiver path mode beyond 50GHz?

Thanks,
rok

Edited by: rok on Jul 23, 2014 7:44 PM

> {quote：title = rok写道：} {quote}>您好，>>感谢您的回复和澄清。
因此，由于不涉及切换，那么对于那些重叠情况，为了使用可用的，可以为噪声接收器路径设置从45到50GHz的1个NF测量信道，然后使用标准接收器设置另一个NF测量50到55GHz
然后将结果“拼接”在一起以获得45到55GHz的NF行为。
>那是一种方式。
但是你可以做出多大的测量取决于你想要测量的东西。
专用噪声接收器和NA接收器之间存在显着的性能差异。
噪声接收器具有低噪声系数，并且还具有低噪声前置放大器，因此可以非常精确地测量非常小的噪声系数。
另一方面，NA接收器的噪声系数约为35 dB，没有内置前置放大器，没有宽IF滤波器（仅高达1.2 MHz BW），标准配置仅适用于测量具有增益+噪声的设备
高于35 dB。
如果您测量的是属于该类别，那么您也可以考虑将NA接收器用于整个45-55 GHz频段，并节省设置和校准以及从两个通道缝合数据的麻烦。
如果您正在尝试测量低增益，低噪声设备，那么您无法在任何频率下使用NA接收器直接测量它，您将需要包括您自己的前置放大器，反向接收器耦合器或两者。
如果你必须为50 GHz以上的测量做到这一点，那么你也要注意在整个45-55 GHz频段使用这种配置。
唯一一次你的拼接方法是最好的选择是你的前置放大器LNA只能在50 GHz以上工作。
>现在假设我们通过噪声接收器路径运行超过50GHz。
前置放大器是否适用于50GHz以上的频率。
如果是这样的话，它的行为是否也会超出这个限制？
在噪声接收器路径中，同样适用于超过50GHz的IF滤波器组吗？
操作PNA-X噪声接收器路径模式超过50GHz是否有任何损坏风险？
> IF滤波器仍然工作原理，因为它们工作在IF频率而不是RF。
前置放大器仍处于环路中，但未指定其高于50 GHz的性能。
很可能它们各自的增益显着下降到50以上。只要所有功率水平仍然在正常工作范围内，过度扫描噪声接收器就没有损坏风险。



     以下为原文

  > {quote:title=rok wrote:}{quote}
> Hi,
> 
> Thanks for the reply and clarification. So since there is no switching involved, then for those overlap cases, in order to use what is available, one would setup 1 NF measurement channel from 45 to 50GHz for the noise receiver pathway and then another NF measurement 50 to 55GHz using the standard receivers and then 'stitch' the results together to get the 45 to 55GHz NF behavior.
> 

That's one way.  but how good a measurement you can make depends on what you are trying to measure.  there is a significant performance difference between the dedicated noise receiver and the NA receiver.  the noise receiver has low noise figure and it also has the low noise pre-amps to make it possible to measure very small noise figures very accurately.  the NA receiver on the other hand has about 35 dB noise figure, no built-in pre-amps, no wide IF filters (only up to 1.2 MHz BW) and in a standard configuration only suitable to measure a device that has gain+noise above 35 dB.  if what you are measuring falls into that category, then you mind as well just use the NA receiver for the whole 45-55 GHz band and save yourself the hassle of setting up and calibrating, and stitching data from two channels.  if you are trying to measure a low gain, low noise device, then you can't directly measure it with the NA receiver at any frequency and you will need to include your own pre-amp, reverse the receiver coupler or both.  Again if you have to do that for the measurements above 50 GHz, then you mind as well use that configuration for the whole 45-55 GHz band.  the only time your stitching approach is the best option is if your pre-amp LNA only works above 50 GHz.

> Now suppose we do operate beyond 50GHz via the noise receiver pathway. Will the pre-amplifier be applied for those frequencies beyond 50GHz. And if so, would its behavior also be unknown beyond that limit? And would the same apply for the IF filter bank beyond 50GHz in the noise receiver pathway? Is there any risk of damage in operating the PNA-X Noise receiver path mode beyond 50GHz?
> 

the IF filters still works the same because they operate at the IF frequency and not the RF.   the pre-amps are still in the loop, but their performance above 50 GHz is not specified.  it is very much possible that their respective gain drops significantly above 50.  there is no damage risk by over-sweeping the noise receiver as long as all the power levels are still within the normal operating range.

我知道您希望将噪声接收器用于45~55 GHz噪声系数测量。
但另一种选择是使用标准接收器进行整个45~55 GHz测量，然后您不需要将两个测量结合在一起。



     以下为原文

  I understand you would like to use the noise receiver for the 45~55 GHz noise figure measurement. But another choice is to use the standard receiver for the whole 45~55 GHz measurement, then you don't need to stitch two measurements together.