What Si4x6x reference designs need external power supply even if being connected to the Wireless Motherboard (WMB-930)?
Si4x6x reference designs with additional external FEM or FET require external power supply even if connected to the Wireless Motherboard, WMB-930. It means to use an external 4xAA battery pack connected to the RF Pico Board. The reference Pico Boards also use an external LDO in order to ensure the required 3.3 or 3.6V power supply for the radio and FEM/FET.
The external power supply is required due to the higher current consumption.