What is an appropriate range of error in receiver sensitivity during production?

[pkr2258]

Hello.

During production, we occasionally encounter products that exceed the reception sensitivity standards.

Of course, we only select those that completely exceed the sensitivity limits after repeated attempts, not those in a shielded room.

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In reality, there are cases where the difference is more than 10dBm.

Of course, there's absolutely nothing wrong with the operation. Aside from the possible communication range issue...

I don't have any experience with it, but...

What would be a reasonable range for a typical production receiver sensitivity error?

5dBm? / 10dBm?

- Output: 0dBm to 4dBm

- Chip antenna used (matched with CWPG)

- 3V LDO used

- Class F 1005 size resistors used

- 1005 size wire-wound inductors used in the RF section

- NPO grade MLCCs used

thank you

[Kazi Afroza Sultana]

Hello,

I can not see any specific production receiver sensitivity error range in dB documented in the official product documents. There are some errata which mentions specific cases where receiver sensitivity is degraded by 1-4 dB due to known silicon issues. However, these are not common production tolerances. They are specific to certain revisions or package types and are considered anomalies, not normal variation. For example: Errata nRF52840 Engineering A, Errata nRF52832 Rev3.

There is also a previous case I can see where our hardware expert talks about typical output power variation is +/-1.3 dB, device to device, in room temperature. (2) Tone of Tolerance (Power) value for nrf52832 - Nordic Q&A - Nordic DevZone - Nordic DevZone. But this is not for receiver sensitivity and does not account for all environmental or process variations.

However, 10dB variation is never expected and not ideal at all. If you see receiver sensitivity variation is 10dB, then you must review your design.

Thanks.

BR
Kazi