nRF52840 receiver sensitivity specification discrepancy

[dom]

nRF52840 OPS 0.5.1 lists the following highlighted sensitivity spec:

The Bluetooth core spec defines sensitivity for this payload length as a BER of 0.017%, not 0.01% as you have defined it:

Please clarify whether your sensitivity spec is defined at BER 0.01% or 0.017%.

[ketiljo]

The sensitivity limit is stated in the datasheet as for short packets, < 37 bytes, BER = 0.1 % and for long packets, BER = 0.01 %. 

The Bluetooth definition is that BER shall be better than 0.017% at -70 dBm. This is not the same as the sensitivity limit in the datasheet. 

 

 

[dom]

No, I think you are incorrect. The Bluetooth requirement is that actual sensitivity is better than -70 dBm for LE Uncoded PHYs. Actual sensitivity is defined by the Bluetooth spec as the receiver input level for which 0.017% BER is achieved for payload lengths >= 128 bytes.

My initial question (bolded above) still stands.

Here is the full sensitivity section in the bluetooth  spec:

[ketiljo]

The Bluetooth specification have set of minimum requirements for the receiver. This is to ensure that the Bluetooth technology is only used on HW with good (enough) performance. 

They say that the level when BER is measured to be 0.017% shall be < -70 dBm. We measure 0.01%, less than 0.017%, at our sensitivity limit, which is lower than -70 dBm. So all is good.

We define the sensitivity limit as the input level when PER = 0.01%