nrf52832 schematic review

RE: nrf52832 schematic review

AmbystomaLabs — Wed, 04 Apr 2018 11:40:33 GMT

Even so they would still need to do the layout correctly or they will get a open stub on the line.

Their antenna measurements stated that both elements were active at the same time. Due to the poor match their antenna efficiency was -8dB which is 6dB down from the antenna spec. Or another way to look at it is, they just halved their range.

I think they really think they can put two antennae together like that. Earlier they referred to it as a splitter.

Little do they know!

RE: nrf52832 schematic review

ketiljo — Wed, 04 Apr 2018 07:56:44 GMT

The idea is probably to populate only one of the caps to be able to change the antenna without a PCB re-spin.

RE: nrf52832 schematic review

AmbystomaLabs — Tue, 03 Apr 2018 18:47:43 GMT

What LNA are you referring to? There isn't one on your design. I see two antennae slapped together with some caps. That won't work.

RE: nrf52832 schematic review

jimhan1960 — Tue, 03 Apr 2018 18:06:29 GMT

Can you be more specific as to the arrangement issues? Did you notice the placement of the LNA's behind the splitters, these would be more effective in front yes?

RE: nrf52832 schematic review

jimhan1960 — Tue, 03 Apr 2018 18:04:03 GMT

devzone.nordicsemi.com/.../R_2D00_1284_2D00_2_2D00_1-Measurement-of-tag-in-chamber.docx

Ketil, Attached is a report where our antenna was tested. Can you review and comment?

RE: nrf52832 schematic review

AmbystomaLabs — Tue, 03 Apr 2018 14:05:20 GMT

Your dual antenna arrangement won't work unless you lay it out correctly.

RE: nrf52832 schematic review

ketiljo — Tue, 03 Apr 2018 13:37:49 GMT

The schematic looks correct. To avoid getting hard to find capacitor values for C125 and C126, it's a good idea to place a empty footprint in parallel with each of the caps. It makes NFC antenna tuning easier.

best regards,

Ketil Aas-Johansen