Hi Forum,
What is the recommended PCB stack-up for the nRF9160 Thing Plus?
Thanks in advanced
Basically everything we make is FR4, if that’s what you’re askin’
If you mean the actual layer order you can always open our eagle files for whatever board https://cdn.sparkfun.com/assets/0/0/9/c … eFiles.zip (nrf9160) and see components, layers, etc
Hi Russell,
What I am looking for is the recommended layer height between the top layer and the 2nd layer to achieve 50Ohm impedance for the antenna trace.
When I open the Eagle file it only tells me that the board has a thickness of 1.64mm and is 4 layers.
https://forum.sparkfun.com/download/fil … ew&id=8244
I am new to Eagle and might be looking in the wrong place.
For as short a trace as I imagine you will use, you are probably overthinking this. But you can calculate it using a calculator similar to: https://www.digikey.com/en/resources/co … -impedance
Dielectric of FR4 is usually around 4.4 (+/- 0.4). 1oz copper layer is around 1.4mil; 0.5oz copper around 0.7mil.