nRF52840 Layout and Impedance

RE: nRF52840 Layout and Impedance

ZAC — Fri, 16 Mar 2018 15:42:23 GMT

Thanks for the feedback. Measured impedance values in the near future would be helpful to have.

RE: nRF52840 Layout and Impedance

FormerMember — Fri, 16 Mar 2018 13:55:22 GMT

The values needed may slightly vary from design to design. If you have a look at the reference layout (not the nRF52840-DK), you see that the values are slightly different. If you follow the reference design or the nRF52840-DK the result is likely to be quite good.

What is as important is that the layout itself is a copy of our reference layout/nRF52840-DK: It means that the matching network for the chip (C3,L1, C4) is an exact copy of our ref. layout with respect to the geometry and distances. This does also apply for the distance from the chip to C3. In addition, it is important to have a keep-out area of the inner layers in the RF part, see the reference layout.

RE: nRF52840 Layout and Impedance

ZAC — Fri, 16 Mar 2018 13:46:23 GMT

Any updates on the measured values?

RE: nRF52840 Layout and Impedance

FormerMember — Fri, 16 Mar 2018 13:45:00 GMT

Yes, you should follow the newest one.