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Recommend Chip antenna for nrf5340

Dhruvit

Hi,

Designing a board with limited space (35-40mm) and need a chip antenna recommendation for the RF transceiver.

Anyone have experience with the Johnson Technology 2450AT18B100 in a similar situation?

Thanks & Regards.

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  • 0

    Hi, Dhruvit.

    It is a chip antenna from Johanson used with the nRF5340 on the nRF7002 DK (hardware files downloadable from here).

    To find what antenna suits your board the best, I suggest that you contact the antenna provider directly. A relevant place to look regarding Johanson antennas specifically, could be their chip antenna selection guide.

    Best regards,
    Mathias

  • 0 in reply to mathiaso

    Hi Mathias,

    Thank you for your reply and suggestions on the chip antenna.

    I have a follow-up question regarding powering the nRF5340. I plan to use a wireless Qi-compatible PMIC as the primary power source, along with its integrated battery charger functionality.

    The nRF5340 has built-in DC-DC converters. My question is: Do I still need to implement all three of these on-chip DC-DC converters components if I plan to use only one as a backup power option in case the PMIC fails? Since space on the PCB is limited for the MCU, PMIC, MEMS sensor, and external flash, I'd like to skip using the remaining two DC-DC converters to save space.

  • 0 in reply to Dhruvit
    Dhruvit said:
    The nRF5340 has built-in DC-DC converters. My question is: Do I still need to implement all three of these on-chip DC-DC converters components if I plan to use only one as a backup power option in case the PMIC fails? Since space on the PCB is limited for the MCU, PMIC, MEMS sensor, and external flash, I'd like to skip using the remaining two DC-DC converters to save space.

    If you have a look at the different options for the reference circuitry, you can see that you choose yourself if you want to enable the regulators in DC/DC mode or if you want to operate them in LDO mode. Is that what you were thinking of?

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  • 0 in reply to Dhruvit
    Dhruvit said:
    The nRF5340 has built-in DC-DC converters. My question is: Do I still need to implement all three of these on-chip DC-DC converters components if I plan to use only one as a backup power option in case the PMIC fails? Since space on the PCB is limited for the MCU, PMIC, MEMS sensor, and external flash, I'd like to skip using the remaining two DC-DC converters to save space.

    If you have a look at the different options for the reference circuitry, you can see that you choose yourself if you want to enable the regulators in DC/DC mode or if you want to operate them in LDO mode. Is that what you were thinking of?

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  • 0 in reply to mathiaso

    Hi,

    I'm considering powering the nRF5340 microcontroller using an external supply. Since the internal DC/DC buck converter and LDO would not be needed in this scenario, can I remove the associated components like inductors and capacitors?

    However, I understand that the nRF5340 still requires a stable voltage supply for its internal circuitry (RF, NFC, etc.). Do I still need an DC/DC converter to provide this stable voltage, or are there alternative approaches?

  • 0 in reply to Dhruvit
    Dhruvit said:
    Since the internal DC/DC buck converter and LDO would not be needed in this scenario, can I remove the associated components like inductors and capacitors?

    You can freely choose between the different configurations in the reference circuitry to go with the option that best suits your needs. So yes, you can choose an option with fewer inductors and capacitors than the others. Please read the general guidance points found on the reference circuitry page.

    Dhruvit said:
    However, I understand that the nRF5340 still requires a stable voltage supply for its internal circuitry (RF, NFC, etc.). Do I still need an DC/DC converter to provide this stable voltage, or are there alternative approaches?

    Yes, it will use the internal regulators to provide a stable voltage for its internal circuitry. However, the extra components are only there to give the possibility of enabling the DC/DC mode instead of the LDO mode. This is described more in detail on the regulators page.

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