About minimum RSSI of nRF51822

[makoto]

We are using the nRF51822 on our product.

I'd like to know about the minimum value of RSSI ?

We checked the minimum RSSI value by using our products.

And most of our products,the minimum RSSI value are -98dBm.

And there are no product have under -99dBm RSSI.

Are there any reason or limitation about that?

When we try a large mount of samples the result shows "Gaussian distribution",I think.

[Sigurd]

Hi,

The radio in nRF51822 have -93dBm RX sensitivity in BLE mode(1Mbps). This means that -93dBm is the lowest signal level the receiver can detect the RF signal and demodulate the data reliably. The -98dBm you are measuring is caused by RSSI measuring inaccuracies.

For the nRF52832 the RX sensitivity is -96dBm in BLE mode(1Mbps). With Bluetooth 5 long range(125kbps), the nRF52840 have -103dBm RX sensitivity.