SWRZ092B April 2021 – March 2022 IWR6843AOP
TX, RX Calibrations Sensitive to Large External Interference
IWR6843AOP ES1.0, ES2.0
External interference present on the RX or TX pins, during the period of the device calibration at RfInit, can lead to degraded accuracy or errors in the calibration results. If the interference changes its level while these calibrations are actively running, the calibration algorithm may interpret this as a change in signal power, leading to incorrect convergence. This applies to boot-time PD, Rx IQ mismatch calibration, Rx gain calibration, Tx power calibration, and phase-shifter calibration.
Workaround is to save the boot time calibrations at production (done in a clean environment without interference) and during operation, the calibrations can be restored.