AD9371 RF Design

[ashesh223]

Hello All!

I'm new to RF design but know the basic tools of ADS. I want to build and simulate the RF circuit for the AD9371 chip. After reading the datasheet and user guide, I understood the chain that will be used to build one.
RX/TX port --> [matching network] --> Balaun --> [matching network]-->SMA connector.
I got the s1p and s2p files of the RX and TX ports and s3p files of the Balun.

Till now, I've been able to make a matching network between the Balauna and SMA connector, with the help of the smith chart utility tool. But I'm not able to figure out between RX/TX port and Balaun.
I've tried with the DAC element by loading the SEDZ file and using the variables and by directly using the s2p file. But, still I'm not able to get the results.

Can anyone tell me what I'm missing?
What approach should I use?
Any specific tips that will be useful while doing this?
It will be helpful if anyone can share any article that can be helpful.

 

[BigBoss]

Whay RX and TX Ports have different?? RX Port has one single Port, (normal, it's OK) but TX Port has 2-Port. There is a misconception here.

 

[ashesh223]

Whay RX and TX Ports have different?? RX Port has one single Port, (normal, it's OK) but TX Port has 2-Port. There is a misconception here.

Hey

So, in this chip according to datasheet, RX and TX port are the differential and further it requires a balaun that converts the differential to single port that will be connected to SMA connector.

 

[BigBoss]

Hey

So, in this chip according to datasheet, RX and TX port are the differential and further it requires a balaun that converts the differential to single port that will be connected to SMA connector.

So, s2p represents two single ended but in differential form. Right?
In this case you have to consider differential impedance matching by applying differential mode but folded single ended configuration.
You don't know probably this technique and therefore matching does not occur.

 

[ashesh223]

So, s2p represents two single ended but in differential form. Right?
In this case you have to consider differential impedance matching by applying differential mode but folded single ended configuration.
You don't know probably this technique and therefore matching does not occur.

Thanks for your insights!

Yes, I don't know about it. I'll go through it.
Would like to know if there is anything else that can be helpful while doing the matching network.

I've used the DAC element and loaded the SEDZ RX file provided by the vendor.

and used the following variables as below.

Now, I'm struggling to make a matching netowork between laminate and balaun.