Fluctuating BLE TX Output Power Value – KBA223309

Version: **

 

Question:

TX output power value from the BLE device is fluctuating from its expected value. How to resolve this issue?

 

Answer:

The TX output power from the device remains the same unless changed by the firmware. One of the probable reasons for the output power to vary from channel to channel is that if the impedance of the PSoC 4 BLE radio or the antenna is not properly matched. As Bluetooth does frequency hopping, the RSSI could be seen fluctuating. Therefore, it is worth checking the matching networks with a network analyzer to see if the impedance is properly matched.