• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 210 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

IWR6843: Change in EIRP with the antenna temperature

Kouki Yamamoto
Prodigy 20 points
Part Number: IWR6843

Tool/software:

Hi.

When the antenna was connected to IWR6843 and operated, the EIRP decreased as the antenna temperature increased.
(Tx1:40°C→EIRP:13.5dBm, Tx1:60°C→12.7dBm)
Antenna temperatures were obtained from IWR6843.
Calibration is performed at startup, but not on a regular basis.
Is this change in EIRP with temperature due to a change in the current supplied from IWR6843 to the antenna?
Does the supply current of IWR6843 vary with junction temperature?
If so, please provide documentation showing the relationship between temperature and supply current.

Thank you.

  • +1
    TI__Expert 4280 points

    Yamamoto-san, 

    I presume the antenna and the radar are in the same temperature envirmonment. In that case, if periodic runtime calibrations are not done, the radar EIRP perfomance would be expected to reduce as temperature rises. In the case that the device temperature is changing, periodic run-time calibrations can be performed to adjust performance to match temperature condions. Please read this application note on calibrations for more information on resolving this. (https://www.ti.com/lit/an/spracf4c/spracf4c.pdf)

    Thanks, 

    Blake