Interfacing - STM32WB Series MCUs with an external power amplifier

[PMeth.1]

I want to use external PA (SKY66118-11) with STM32WB55. Shall i connect RF pin of STM32WB55 to RFIN pin of SKY66118-11 directly or i have to connect it through matching and/or 50ohm balun.

[Remi QUINTIN]

You must connect the RF output pin of the STM32WB to the RFIN pin of the external PA via a 50-ohm matching network as the RF output does not offer a 50 ohm interface.

So the path is:

STM32WB Internal PA => RF output pin => 50 Ohm Matching Network => RFIN pin of the external PA.