IWR6843ISK-ODS: Numbering of antennas on the chip

Hi, 

Usman Mahmood Khan said:

- If it is correct, then the ordering of virtual antennas arrays doesn't seem right. For example, the top horizontal row should be 4 (TX1-RX4), 1 (TX1-RX1), 8 (TX2-RX4), 5 (TX2-RX1). Am I missing something here?

Can you please let me know the reasoning why you think so? 

Usman Mahmood Khan said:

- Are any phase or amplitude calibrations required (other than 180 degree phase inversion for RX2 and RX3) for TX/RX antennas (when collecting raw ADC data through DCA1000)?

For calibration please refer to "6. 8. Range Bias and Rx Channel Gain/Offset Measurement and Compensation" in mmwave SDK user guide 

Regards, 

Sudharshan K N 

Thanks for the response.

My reasoning for the order is that the distances between all the virtual antennas should be the same i.e., lambda/2.

Assume the distance between TX1 and RX1 is 'd'. Then the effective distances for all four pairs (based on the order shown in the figure) will be 'd', 'd-lambda/2', 'd+lambda', and 'd+lambda/2'. As you can see, they are not equally spaced.

Based on the order I mentioned i.e., 4 (TX1-RX4), 1 (TX1-RX1), 8 (TX2-RX4), 5 (TX2-RX1), the effective distances will be 'd-lambda/2', 'd', 'd+lambda/2', and 'd+lambda'. In this case, all elements have an equal spacing of lambda/2.