AWR1642: Questions about received ADC raw data and IF signal

Hi,

For #1, can you please provide the full configuration?

thank you
Cesar

Cesar,

Below is the cfg, pls help check and involve the hardware expert in asap. Appreciated.

Hello Andy,

Could you feed in these configuration in mmWave Studio RampTimingCalculator and find the validity of parameters?

What I have got with the calculator that for 99% settling ADC start time must be at least 4.09usec.

Regards,

Jitendra

Hi Jitendra,

For the second question related ADC valid start time, i can understand it is need to ensure the ADC valid start time set based on below post.

https://e2e.ti.com/support/sensor/mmwave_sensors/f/1023/p/601371/2222050#2222050

For the first issue the signal plotted using the ADC raw data, increase the ADC valid start and idle time, there is no improve, the spur always exist, the signal become bad if the sweep bandwidth is less. They use the AWR1642 ES1.0 for test, need your help support the first question, thanks.

Andy

Hello Andy,
Is this spur seen during this brandwidth or other band as well? If we increase the bandwidth (may be beyond 1GHz) then what is spur status?
And can you help me understand about x/y axis of 1st plot?


Regards,
Jitendra

Jitendra,

For the figure of the first issue, it is plotted using the captured ADC raw data, x axis is the adc sample point from 0~99 (adc sample point number=100), y axis is the amplitude of each sample. U can try it at your 1642 EVM to check if it can be reproduced or not:)
Andy

Jitendra, any update here? thanks.

Andy,

Could you clarify few more points regarding to this issue
• Please explain in detail about what customer is facing and with the info of configuration/raw data/plots etc. From the above plot we are not clear about spur.
• Are they sure there is no other object in the scene (may be wall or other reflective obstacles)?
• Have they tried same scenario with higher frequency band?


Regards,
Jitendra

    We tried different bandwith and the time-domain data was showed in the picture .all the configure setting was the same as the 99% settling of calculator . we did this in our office with radar facing the ceiling.

   What  we want to konw is why the signal has more spur with less bandwith  ,  when we set Bandwith < 100M , because of the supr , it reduces signal and noise ratio  .Can you use your 1642 EVM to check if there is supr when Bandwith < 100M? 

  thanks~