Hi,
I have been developing a PCB with an nRF9151 and a SKY65943-11 LNA among other ICs. I looked up the nRF9151 Development Kit (PCA10171) datasheet for some of the pinouts and details, which has been helpful so far.
However, there are some components on the dev board that I am unsure whether I need or not regarding the RF line.
I am not using a GNSS antenna connector between the nRF9151 and SKY65943-11 (J2 antenna receptacle) as it is on the dev board, just an antenna connected to the RF_IN pin of the LNA for the GPS signal. Based on the datasheet of the SKY65943-11, there are no capacitors needed on that 50 Ω trace between the RF_OUT pin of the LNA and the GPS pin of the nRF9151.
I'm wondering if I need the C11, C12, and C13 capacitors, as well as the L3 inductor with VDD input on the GPS-RF_OUT line, or not? I'm assuming it should simply be a 50 Ω trace, but I haven't been able to find any information regarding the setup of the GPS pin of the nRF9151.
Cheers,
Best, Andras