How do I read Mixed-Mode of S4P file in ADS ?

today, I use Agilent PNA-X N5247A to measure a 4 port differential LNA

I choose the Mixed-Mode type of S4P file to save


BUT in ADS , how could I read the S4P correctly?

Some people says use ideal balun in ADS, combine 4port ==> 2port can read Sdd (differential in & out) S_paramter

Is it correctly? And how could I read other type of S_parameter ,such as Scd,Sdc,


Attachment is my measure file, anyone can help me .

vb1_5_vb2_0_4_vd3_14_259ma.rar


thx for your help.

Hello, LeeFred
Reading Mixed-Mode of S4P file in ADS shows in picture.
What you need to pay attention to is input and output port .
In the picture,1 and 3 are input. 2 and 4 are output.

Thx for your help!

But I have a problem about what "type" of in/output situation is ? (In your ways)

I know the S4P file have the 4 types, include Sdd(differential-differential),Sdc(differential-common),Scd(common-differential),Scc(common-common)

It seems is Sdd in your ways, right?

The cases that you have listed are for specific modes.

In general, the 4-port device can be measured as that: four ports, without implying any specific mode. Such 4-port measurement includes all possible excitations, including the special cases of common mode (i1=i2) and differential mode (i1=-i2).

I don't know your specific VNA, but would expect that the S4P file includes that general data, without restricting it to specific modes. Results for specific modes would be S2P data.