AnsweredAssumed Answered

AD9361 LO calibration is not stability

Question asked by KcMeterCEC on Dec 7, 2017
Latest reply on Dec 12, 2017 by KcMeterCEC

Hi guys,

I have a question about AD9361 LO calibration.Below is the environment what i used:

1. I reference AD9361 wiki to ported the driver to petalinux 2016.2 which use linux kernel 4.4.

2. The corresponding device tree is reference adi-fmcomms2.dtsi.

3. The device driver was probed succeeded,and i can see many files from sysfs.

4. The default ensm mode is FDD, i be aware of the TX and RX LO can't set to same frequency

(The default frequency about RX LO is 2.4GHz).

5. I set the frequency from the AD9361 digital interface is 1MHz.

 

It's look like very smoothly.

 

Then i want to output a frequency at 2.1GHz and 2.2GHz, i set the TX LO frequency:

echo 2101000000 > out_altvoltage1_TX_LO_frequency

"wait about 5 seconds"

echo 2301000000 > out_altvoltage1_TX_LO_frequency

 

unfortunately, many times it can't be calibrated stability. Just like this:

9361_spec

 

Did i doing something wrong?Thanks!

Outcomes