请问AD8343的S参数仿真的外围电路怎样设计？

您好！
对于AD8343 S参数模型，解释如下，供您参考。
The S2P file provides differential impedance measurements. The S2P port assignments are as follows:
 

Port 1: differential input

Port 2: differential output

 
In most cases the 2-port data will be all you'll need to develop matching networks for the AD8343. LO port can be considered as a 50 ohm input.

您好！
请问我下面这个ADS仿真中Ref脚需要接什么？
当Ref脚悬空的时候，此时仿真出来的S（2,1）与S（1,2）的两条线的增益是重叠的。
请给予指导。
谢谢！

您好!
我现在ADS仿真中不知道如何接入二端口。请您解释一下哪个端口是输出，哪个端口是接50欧姆的电阻，还有接50欧姆电阻代替本振时，是需要接一个地还是信号源呢？
我是如下面这样接的：
 
 
 
 
仿真出来的结果是：
 
这样结果S（1,2）与S（2,1）的两条线的增益基本上是一样的了，请问这样有什么问题吗？
 
 
 
 
 
我还有一种二端口的接法如下：
 
 
 
其仿真出来的结果如下：
 
 
请问怎么样改进呢？由于课题时间比较紧张，请您快一点回复！
谢谢！
蒋相
桂林电子科技大学。

您好！
对于AD8343 S参数的使用产品线工程师解释如下，供您参考。
Is there any reason you chose AD8343 over its next generations: AD8342 and ADL5801? Both AD8342 and ADL5801are higher performance active mixers, and much easier to use because of their boardband characteristics.
 
AD8343 s-parameters are provided for purposes of input/output matching, but not freqeuncy conversion simulation. If you look into the s2p file, you will see all 4 parameters were measured under the same corresponding freqeuncy. This means no freqeuncy translation was involved, or LO was zero. In this case, s12 and s21(aka gain for its magnitude) are not useful data for any mixer simulation, but s11 and s22 have valuable service for impedance matching. Once you find the proper matching for the mixer at desired band, you would need to implement the matching on a prototype board rather than relying on any simulation.
 
Regarding the stability consideration, page 21 and 22 have the full discussion. I'm not sure if I can add anything else. Once you set up the mixer on board, you should be able to see if there is any oscillation to verify your stabilty.