nRF52 LO leakage

[JK5]

On the nRF51, LO leakage was measured when in receive mode.
For 2402~2480mhz, LO leakage was measured at approximately 2745~2836mhz.
The nRF52 does not measure LO leakage.
I can't measure at 4.8ghz either, what should I measure?

[Priyanka]

Hi,

I am discussing this internally with a few experts and will get back to you as soon as we get a solid conclusion. 

Regards,

Priyanka

[JK5]

I'm using nRF52810 and I'll give you the marking code.
"
N52810
QFAAD0
2412AJ
"
I couldn't find any LO leakage frequency for the nRF52 no matter how much I searched.
Please give me an answer as soon as possible.

[Priyanka]

Hi,

If you want to measure / look for LO leakage on nRF52 series you need to measure at f_RF-1MHz for BLE1M and f_RF-2MHz for BLE2M

-Priyanka

[JK5]

I'm using the example file radio_test.

You mean set "Start RX carrier" and set the channel to 40 (2440Mhz) and the data rate to 1Mbit.

Then the LO leakge is 2439Mhz?

I've tried this and I can't measure LO leakage at all.

[Priyanka]

I have alerted this internally and will get back to you.

-Priyanka

[JK5]

When can you let me know?

[Priyanka]

Hi,
Please note that expected power level on the LO leakage is very low, around -90 to -100 dBm, maybe? So to measure this you need to reduce input attenuation of the spectrum analyzer to 0 dB and also set RBW to a low value to see the power above the noise level. Hope this helps.

-Priyanka