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TX quadrature calibration temperature dependence

Question asked by obenj on May 21, 2015
Latest reply on Jun 3, 2015 by tlili

The TX quad cal section of the ad9361 reference manual (ug570) states that the cal procedure should be performed again if device temperature changes "dramatically." I have a couple questions:

 

1) Should the NCO phase offsets used have any temperature dependence? Or could the same phase offsets values to refresh the cal results if the sample rate, TX FIR/HB filters, and analog filter settings stay the same? I'm following up here from ad9361 repeated tx quad cal with sample rate & BW changes.

 

2) Would you expect that temperature thresholds for refreshing cal results are the same across individual transceivers/dies?

 

3) If the answer to (2) is yes: is there a temperature threshold that has some testing behind it for some X dBc?

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