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Inductor Considerations for NRF 52832 DC/DC Converter

edougal

Hey, I was considering designing a piece of hardware using the NRF52832 and I want to use the DC/DC converter to save battery life. There are no considerations for choosing an inductor in the LC filter given in the NRF52832 product specification. Why are two inductors used in series in the NRF development board (L2 is 10uH and L3 is 15nH)? Can only L2 be used?

Thanks.

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  • 0

    How will not mounting the 15 nH inductor affect the sensitivity? And does using the DCDC, with recommended components, affect the sensitivity in any way?

  • 0 in reply to FredrikK

    How ignoring the inductor reduces sensitivity? My guess: 15nH has decent inductive reactance (over 200R) only at 2.45 GHz and above. It means it's placed for a reason - to reduce switching noise floor and help to receive weak signals. 10uH main inductor will become capacitive just beyond 10MHz!¬ I didn't find any ferrite offering me 10uH predictable inductance and low losses at 8MHz. 2 components are needed. On the other hand: many data lines ferrites may do much better filtering job than 15nH inductor.

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  • 0 in reply to FredrikK

    How ignoring the inductor reduces sensitivity? My guess: 15nH has decent inductive reactance (over 200R) only at 2.45 GHz and above. It means it's placed for a reason - to reduce switching noise floor and help to receive weak signals. 10uH main inductor will become capacitive just beyond 10MHz!¬ I didn't find any ferrite offering me 10uH predictable inductance and low losses at 8MHz. 2 components are needed. On the other hand: many data lines ferrites may do much better filtering job than 15nH inductor.

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