Balun nRF52

[vidal]

Hello,

Can you share with us the balun of the nRF52 chipset or at least the ZLoad equivalent, that is R + jX value.

The Balun if the nRF52 is a 6-Element Balun or 4-Element Balun?.

Thanks in advance.

Jose.

[AmbystomaLabs]

There is no balun required for nRF52 SoC's. All the antenna connections are single ended.

Only nRF 51 chipsets have balanced antenna connections and require a balun.

[vidal]

I do not want to create a balun, I want to know about the internal balun of the nRF52 SoC or the ZLoad equivalent, that is R + jX value.

[AmbystomaLabs]

You should contact Nordic directly if you are interested in the internal architecture of their SoC's. This site is really about implementation of their chips into products. The internal RF structure of the chips isn't useful for the hardware design.

With regard to external matching, again they are all single ended products. Most people follow the reference designs verbatim. Otherwise if you are doing a highly custom design it is always recommended to employ a VNA and standard matching techniques to come up with your own solution as your embedded RF environment will likely differ significantly from the reference design. Generally they don't even specify Zin for this reason. Your embedded Zin will differ from the reference design unless you follow the reference design absolutely. As such designing around a spec'd Zin will be largely futile.

[vidal]

I want to know the Zin because your reference design is not good at all. You can see this post:

devzone.nordicsemi.com/.../

Please can you contact with Nordic in order to get the internal balun.

[AmbystomaLabs]

I don't think you understand how this blog works. The bulk of the people who provide information on this site do not work for Nordic, including myself. We provide information and support as part of the ecosystem and developer community utilizing Nordic devices. We do this for free in our spare time.

Nordic does however provided significant support on this site and many employees regularly provide answers to posted questions.

With regard to your comment, the post you refer to involves implementing and matching a chip antenna on a custom board.

While it might seem to someone new to RF design that it is a simple matter of hooking up components to make a perfect match...it is not. All designs are highly influenced by their local environment. Epoxy, glass, grounding, vias, trace thickness and width. Even changes as little as a fraction of a millimeter will change a match.