why are the IQ values of nrf5340DK so small? AOA

RE: why are the IQ values of nrf5340DK so small? AOA

Einarh — Tue, 06 Sep 2022 11:04:01 GMT

Hello!

In NCS 1.9.1, there is a 4 bit left shift applied to IQ samples on the nRF5340 and nRF52833. But since the nRF5340 has a 9-bit internal ADC while the nRF52833 has a 12-bit internal ADC, this bit shift affects the magnitude of the IQ samples on the nRF5340 more. This issue has been fixed in upstream Zephyr, so the fix will be included in the next NCS release.

Though even when this issue is dealt with, there may still be differences in the values because of physical differences between the SOCs such as the AGC and the radio peripheral.

Best regards,

Einar

RE: why are the IQ values of nrf5340DK so small? AOA

yntense — Thu, 01 Sep 2022 01:57:04 GMT

thanks

RE: why are the IQ values of nrf5340DK so small? AOA

Einarh — Wed, 31 Aug 2022 12:01:27 GMT

I've asked the direction finding team about this internally, you can expect an answer next week.

-Einar

RE: why are the IQ values of nrf5340DK so small? AOA

yntense — Wed, 31 Aug 2022 11:40:36 GMT

ncs_v1.9.1

RE: why are the IQ values of nrf5340DK so small? AOA

Einarh — Wed, 31 Aug 2022 11:34:59 GMT

Hello

What software version are you using?

Best regards,

Einar