How to design differential LNA input match?

[John_li]

Hi friends,
I want to design differential input match network.Datasheet give me the input port impedence as attached.and I do not know how to match with differential case. My question is in the attached pictures.I need your kindness help me.
And i am lack of differential impedance match,anyone can share me some documents introduced differential port match?
Many thanks in advance,


If i make the match network?which impedance i should match,10+j*33 of 10-j*33 to get good NF?

 

[RCinFLA]

Thoughs are differential output SAW filters in front of IC. The matching is to get from the SAW output Z to IC input Z. It should be conjugate match so it is resonate at operating frequency.

SAW's need to be terminated with proper Z to get proper response so you ahave to go with conjugate match.

Keep in mind that at 2 GHz PCB layout strays will significantly effect the match.

Differential matching is no different then single ended matching. Just split series cap or inductor in two on either side with half the calculated value.

 

[vfone]

**broken link removed**
https://www.wless.ru/files/433-868Mhz/CD1/Documentation/Application Notes/AN427 v0.1.pdf

 

[John_li]

Thank RCinFLA and vfone for kindness.

 

[radamta]

Hi every body
You can help me ! I use **broken link removed** but not true because form SWA to LNA is differential.