SWRZ102B November 2021 – October 2023 AWR2944
PRODUCTION DATA
Spurs caused due to data transfer activity
AWR294x ES1.0, ES2.0
Digital activity related to ADC data transfer between subsystems inside the chip can potentially create spurious tones in the signal due to undesired intra-chip parasitic coupling to RF. This coupling has been observed to cause weak spurs at 5.17MHz, 8.82 MHz and 10.71MHz offsets. The spur in the Rx data would be seen at the spur frequency offset around a strong object.
The start time of data transfer from ADCBUF can be configured to have a random value across chirps. This helps to spread the spur across doppler bins and reduce spur level by ~15dB.