52840 chip precision and consistency problems

RE: 52840 chip precision and consistency problems

Jared — Wed, 29 Sep 2021 09:16:25 GMT

Hi,

See this answer.

regards

Jared

RE: 52840 chip precision and consistency problems

ardenr — Wed, 29 Sep 2021 09:09:01 GMT

Please help to answer the question, thank you.

RE: 52840 chip precision and consistency problems

ardenr — Wed, 29 Sep 2021 00:52:13 GMT

Okay, can you answer the other question?What does RF power accuracy±4 mean in the picture? Is the actual test value between 4 and 12 when I output 8?

RE: 52840 chip precision and consistency problems

Jared — Tue, 28 Sep 2021 11:59:56 GMT

Hi,

I misunderstood you. If the board has been tuned or not is irrelevant for this case as you are connected directly to the radio. I suspect that most of the variation is due to how you're connected, more specifically how you have soldered the connection for each sample. Have you tried measuring it from the connector? Do you see similar variation?

regards

Jared

RE: 52840 chip precision and consistency problems

ardenr — Tue, 28 Sep 2021 09:51:35 GMT

Please help to answer the question, thank you.

RE: 52840 chip precision and consistency problems

ardenr — Tue, 28 Sep 2021 05:15:29 GMT

The data is based on direct testing on the chip side, why the gap is so large.

RE: 52840 chip precision and consistency problems

ardenr — Tue, 28 Sep 2021 05:12:06 GMT

What does RF power accuracy±4 mean in the picture? Is the actual test value between 4 and 12 when I output 8?

RE: 52840 chip precision and consistency problems

ardenr — Mon, 27 Sep 2021 13:00:16 GMT

[quote userid="73165" url="~/f/nordic-q-a/80039/52840-chip-precision-and-consistency-problems/331306#331306"]

If you're using a custom board then you have do an antenna tuning to get optimal performance. Variation in performance of custom boards that hasn't been tuned is expected. See this white paper for more on antenna tuning.

best regards

Jared

[/quote]

Why the same test the same three chips just batch different results will have such a big difference, this is the question I want to know.

RE: 52840 chip precision and consistency problems

Jared — Mon, 27 Sep 2021 12:16:37 GMT

I see.

[quote user="ardenr"]The silkscreen is the mark on the chip as shown below, what does your reference to custom board, has the board been tuned, mean?[/quote]

best regards

Jared

RE: 52840 chip precision and consistency problems

ardenr — Mon, 27 Sep 2021 09:52:05 GMT

RE: 52840 chip precision and consistency problems

ardenr — Mon, 27 Sep 2021 09:51:33 GMT

The silkscreen is the mark on the chip as shown below, what does your reference to custom board, has the board been tuned, mean?

RE: 52840 chip precision and consistency problems

Jared — Mon, 27 Sep 2021 09:18:05 GMT

Hi,

Not sure what silkscreen you are referring too? Is this a marking on the tape and reel? I guess this is on a custom board, has the board been tuned?

regards

Jared