How can I use the EFR32 sub-GHz RF ports in single-ended way?
Both TX and RX sub-GHz RF ports of EFR32 wireless geckos are truly differential ones. However, they can be used in more simple single-ended way as well, which will enable to use more simple matching networks, but, on the other hand, it will sacrifice some RF performance.
For single-ended RX operation, sensitivity degradation of 6 dB is expected. The unused input pin can be connected to GND. Note, that it also affects the performance of RFSENSE.
Regarding the TX, 3 dB lower output power is expected. Also, the harmonic performance will be degraded. The unused TX pin can be connected to GND (to save current).
The single-ended matching network should use halved impedance compared to the differential one, with removed ceramic balun.