Revision(s) Affected:

IWR2944 ES1.0, ES2.0

Description:

In scenarios of no object being present, or a very weak object being present in the vicinity, the sigma delta ADC output could have spurs in the RX spectrum. This is observed only for low RX gain settings. The spur frequency could vary across RX channels. In presence of a real object, this would not be observed.

Workaround(s):

• Workaround#1 : Use higher rx gain (>40dB) in these situations.

• Workaround#2 : Idle channel spur is spread across all doppler bins in 2DFFT at the spur range bin. While detecting peaks in 2D-FFT, users can apply 2D neighborhood peak search (e.g. 2D CFAR-CA), which compares the level with all surrounding bins. This can help avoid detection of idle channel spur as ghost object.