Switching from DWM1000 to DW1000 issues

[Chaabane]

@AndyA

@S_Carroll

Yes, I think this picture tells the story - thanks for sharing.

They look like they may be 0603 case size caps, is that right? Way too big for use at high RF. The mismatch of the thin RF traces and wide component pads will alter the line impedance, causing reflections and power loss.

How many PCB layers are you using? We recommend at least four. Using smaller (ideally 0201) components will allow you to get the all-important decoupling caps as close as possible to the IC.

It’s well worth reading APH001, where the key layout guidelines are presented.

Unfortunately two power pins right next to each other with the RF output next to them does make it rather tricky to get good decoupling in.
We managed to get away with using 0402 parts and then mounting them at an angle so that they could be closer to the chip.

Indeed, it’s very tricky. i’m using only 0402 (only C418 and C425).
For your case, did u manage to put all the components on one side ? we’re redesigning the board to use 4 layers and components on both sides but this will increase the price . I was wondering if you used 4 or 2 layer PCB and If you can share the layout of the decoupling capacitors ? would really appreciate it.