SWRZ092B April 2021 – March 2022 IWR6843AOP
Second Harmonic (HD2) Present in the Receiver
IWR6843AOP ES1.0, ES2.0
There is a finite isolation between the RF pins/package and the FMCW synthesizer. This can create spurious tones at the synthesizer output and lead to appearance of 2nd order harmonics and inter-modulations of expected IF frequencies at RX ADC output. The amplitude of the 2nd harmonic could be as high as -55 dBc, referenced to the power level of the intended tone at the LNA input.
No workaround available at this time. However, in many typical radar usecases the HD2 does not affect the system performance due to two reasons: