Hardware design, test and measurement - All Comments

RE: nRF52832 Specific PCB Guidelines

user86994 — Wed, 19 May 2021 08:54:41 GMT

Wow, all comments in this thread are pretty much trash.
Is it possible that the device is able to work without having the capacitor tied to DEC1?
I recently discovered that there is a major flaw with this being exposed and I would like to know if it is able to work sufficiently without this capacitor.

RE: Automating Power Profiler Kit measurements from the command line

user103346 — Mon, 12 Apr 2021 12:56:12 GMT

It is a very nice tool for device testing in mass production. Thanks.

RE: Current measurement guide: Introduction

user93950 — Fri, 02 Oct 2020 11:37:44 GMT

asd

RE: nRF52805 Specific PCB Guidelines

user2133 — Mon, 24 Aug 2020 21:27:56 GMT

There is often confusion as to the nature of the "The RF matching network (L2, C3 and L1) " shown in the reference design. This is NOT a antenna matching network. (See the description of this network in the datasheet) The antenna matching network will need to be added after the RF matching network (L2, C3 and L1) .. The number of components will be determined by the antenna type used. For a monopole type antenna a Pi network is normally suggested for ease of tuning. The number of components used and values are determined during tuning / testing. For chip antennas the manufactures application notes should be followed.

RE: Current measurement guide: Introduction

user82941 — Thu, 05 Sep 2019 03:42:28 GMT

Thanks

RE: General PCB design guidelines for nRF52 series

user75734 — Mon, 26 Aug 2019 13:20:48 GMT

All links have now been fixed! Sorry that it took so long.

RE: General PCB design guidelines for nRF51 series

user80785 — Wed, 21 Aug 2019 11:01:55 GMT

Hi all, if i don't want to use the J1. What else i should add to the design? what i should modify? is the J1 usefull to match the impedances?

Thanks a lot!

RE: Automating Power Profiler Kit measurements from the command line

user2435 — Mon, 05 Aug 2019 12:50:01 GMT

Great work!

RE: Current measurement guide: Introduction

user78859 — Thu, 04 Jul 2019 23:49:58 GMT

Thanks!

RE: General PCB design guidelines for nRF52 series

user63706 — Wed, 26 Jun 2019 09:51:07 GMT

infocenter.nordicsemi.com/.../nwp_008.pdf

RE: General PCB design guidelines for nRF52 series

user80204 — Fri, 31 May 2019 11:59:34 GMT

Broken link...

RE: General PCB design guidelines for nRF52 series

user80204 — Fri, 31 May 2019 11:58:07 GMT

PCB antenna: The whitepaper "Quarterwave printed monopole antenna for 2.4GHz" explains how to design a PCB antenna.

RE: General PCB design guidelines for nRF52 series

user79991 — Fri, 24 May 2019 10:02:35 GMT

The reference circuitry page link appears still to be broken.

RE: General PCB design guidelines for nRF52 series

user6156 — Mon, 13 May 2019 08:55:28 GMT

Please, can you fix this link? Now I see 404:
"The whitepaper "Quarterwave printed monopole antenna for 2.4GHz" explains how to design a PCB antenna."

RE: General PCB design guidelines for nRF52 series

user69316 — Thu, 21 Mar 2019 10:59:27 GMT

Regarding the 50ohm impedance on transmission line: I downloaded the nRF52840-QIAA Reference Layout 1_0 and opened some of the files in Altium and took a look at the PCB stackup, thickness, track-width and track-separation to coplanar ground, on the part that goes to the (SMA?) connector.

I used two free impedance calculators and had them set to conductor-backed coplanar waveguide. With H=1.51mm, W=0.76mm, S=0.263mm and FR4 (er=4.5), I get for both calculators, Impedance of around 62ohm.

I get that these calculators are based on theoretical equations, but are they in fact approximately 24% off, when calculating the impedance? I guess you have actually measured the impedance to be 50ohm. What are your thoughts on the matter? And what do you recommend if I have different PCB thickness or stackup? What tool to use for approximate design? (I don't have ADS, CST etc.)