GNSS RF interface

Nordic Thingy:91 X Hardware

The signal from the GNSS antenna (A2) is amplified by a Low-Noise Amplifier (LNA) (U9) before being fed to the GNSS RF port of the nRF9151 System in Package (SiP) (M1).

The following figure describes the GNSS RF interface.

Figure 1. nRF9151 and GNSS RFFE
V DD_nR F 91 1V 8_S W GP S _ R F R F _I N 5 V E N 2 V CC 3 R F _OU T 10 GND 1 GND 11 GND 4 GND 9 AMP _IN 8 GND 6 F IL_OU T 7 U9 S KY 65943-11 C32 100pF C33 100nF C31 39pF L5 9.1nH R 54 1M0 C36 100pF C35 100nF GP S _R F 1 GP S _R F 2 V DD_R F _F E _3V 3 L T E _R F C5 4.7 µ F R 1 10k DE C0 C1 15pF C2 100nF C4 100nF C3 47 µ F C6 4.7 µ F GP S _E N V DD_GP IO 65 V DD 14 ANT 35 A UX 37 GP S 42 E NAB L E 10 DE C0 24 nRF9151 M1A nR F 9151 F B 1 120R /0.7A DNM C103 10 µ F