The receiver of RF52840 RX Sensitivity

[Joseph AHN]

Let me know How to measure RX Sensitivity by  TESCOM TC-3000 

My S.W engineer setup TX power +8dBm then He wants to know How can it measure Rx Sensitivity 

nRF52840_PS_v1.1 describe  on "6.20.15.5 Receiver operation" 

that introduces some case "P rx,MAX, Psent,it,1M..." 

But I don`t think I can setup it when I setup for DTM mode 

Pls ref below picture that is my result data of testing 

My customer select our product because Power consumption
She has a development plan this is to use a battery for She`s design
In case, Development focus is to consider power consumption

She wants to know what is best power consumptions mode ( LDO mode or DCDC Mode)

(1) let me know what is different Each T/RX RF performance according to LDO & DCDC Mode? (She wants to know How many different each mode performance )

(2) Is it possible to change LDO / DCDC settings in DTM mode?
Because She should be check performance by equipment tool

(3) If VDDH and VDD power are disconnected from the table below, should the same external LDO power be supplied when using external LDO power?

(4) Does the table below mean that EXT-SUPPLY uses external LDO?

Pls let know your kindly answer 

[Andreas]

Hi,

 

I am not familiar with this tester, but per the Bluetooth spec there is only a requirement that the DUT shall have a sensitivity of -70dBm or better. The tester might just test for this and not allow you to manually change the input power, but you can do this externally using attenuators.

Another possible solution is if there is a way to measure the BER or PER. Lower the input signal strengt (in the instrument or by attenuators) until the BER or PER is below the threshold limit.

 

You seem to have gotten it to work properly though. The sensitivity you measure is a bit worse than the spec, but your layout also differs quite a bit, which might be the cause. You should also make sure to measure in front of the matching network:

 

Best regards,

Andreas