AWR2E44PEVM: How the offset will impact the monitor value for Rx gain and Rx phase

Hi Bryan,

Can you ensure that the run-time calibration configurations are same across the two experiments?

How much time is being represented on the x-axis?

The chip temperature will drift across frames, as the temperature changes, the phase and gain are expected to drift slowly. In my understanding, the variation in gain and phase is not large on the left side. Now, sometimes when the temperature crosses some temperature boundary, the runtime calibrations will trigger and adjust the gain and phase, I think this is happening in the second case. Can you try to repeat both the cases a few times to confirm this observation? Let us compare the case where there are no calibrations triggering in the middle in both the scenarios.

Regards,
Shailesh 

Hi Shailesh

The run-time calibration configuration is same.

I confuse is only with different offset value configuration, but the report value is big different?

Why with big offset both rx gain and phase's report value will become the diagonal lines?

Thanks

Hi Bryan, 

Sorry but it is not very clear to me if you are saying that the difference is bigger than expected or not as big as you expected?

I think you are saying it is big difference because offset alone should not change the way data varies over time, correct? For that my response is the same: 

Shailesh Joshi said:

The chip temperature will drift across frames, as the temperature changes, the phase and gain are expected to drift slowly. In my understanding, the variation in gain and phase is not large on the left side. Now, sometimes when the temperature crosses some temperature boundary, the runtime calibrations will trigger and adjust the gain and phase, I think this is happening in the second case. Can you try to repeat both the cases a few times to confirm this observation? Let us compare the case where there are no calibrations triggering in the middle in both the scenarios.

Regards,
Shailesh

Hi Shailesh

Per my understand the difference will not so big. Because the ambient temperature increase is same, only the offset is different. The rx gain number after add delta of offset will similar. But from the result one is like diagonal lines, the other have spine. 

Thanks

Bryan, 

I think you are largely correct. Only other thing to factor is that sometimes the temperature change can trigger a run time calibration. The sudden shift in values at around time=100 in your right-side plots is looking like a calibration induced shift. The calibrations didn't trigger in the left side case, which is also normal but for comparison we may not be comparing correctly. 

Therefore, in order to compare we should try it a few more times to confirm that it is a repeatable behavior and not affected by calibrations. And if possible, keep the starting device temperature exactly the same in both cases. 

Regards,
Shailesh