Hi, I am new to PCB design, so I want suggestions for my designed PCB. Please review it once and provide feedback upon that. I am making this PCB to use this with Thread and matter-related products. I have used EasyEda to design the PCB and used the reference designs provided by Nordic.
General PCB design guidelines for nRF52 series
Hi, Thanks for the response, I have updated the design with the Gnd. I will update here after changing the other points you have mentioned . Would you please look into this once and find any improvements
Hi,
Sarvesh_dhar said:1- It should be grounded with centerpad - what does this mean, it is a two-layer PCB?
The centerpad, meaning the die ground pad itself needs to be connected to the GND layer by using vias,
Sarvesh_dhar said:2- What does stump mean. ?
A stump, in this sense is an extension of a wire/transmission line that isn't connected to anything. In the antenna path it's important to avoid stump, because it will move the impedance of the line. I marked the stump with a circle, you should remove it.
Sarvesh_dhar said:5- Much more vias in general to stick the GND layer together - mean Top and Bottom layers? , and I need to give more vias to connect the ground of the Top and Bottom layers of the copper area?
Yes, in general, the more vias the better as you will make sure that all of GND on your board is on the same potential.
Sarvesh_dhar said:6- The transmission line does not look like 50 ohm. How do you guess that, although I have tried to tune it as I have attached the screenshot, is that incorrect?
It's a guess ,I have not measured it. But if you have based the dimensions on by calculating it to be 50 ohm then it's ok.
regards
Jared
Gerber_PCB_nrf52840_2024-04-13.zip
Hi, I have implemented the points that you have suggest , would you please review it once
Hi,
The matching components for the radio needs to be placed much more closer to the radio.
Did you place the matching network for the chip antenna? You need a full PI. They should be placed very close to the antenna.
regards
Jared
The matching components for the radio needs to be placed much more closer to the radio.
How close are you saying they should be?
It seems that you changed the ANT path, can you share the schematic for the new revision as well?
No, I have not changed the ANT path, I have added a connector also via Resistor to use the external antenna or onboard antenna options
What is the trace width that you're using?
All the traces are 0.051 mm in width, and ANT traces is 2.92 mm
Did you place the matching network for the chip antenna? You need a full PI. They should be placed very close to the antenna.
Yes, there is an RC filter for that as well
.
The matching components for the radio needs to be placed much more closer to the radio.
How close are you saying they should be?
It seems that you changed the ANT path, can you share the schematic for the new revision as well?
No, I have not changed the ANT path, I have added a connector also via Resistor to use the external antenna or onboard antenna options
What is the trace width that you're using?
All the traces are 0.051 mm in width, and ANT traces is 2.92 mm
Did you place the matching network for the chip antenna? You need a full PI. They should be placed very close to the antenna.
Yes, there is an RC filter for that as well.
Hi,
I think that you get DRC error because you have set the track clearance too high.
The datasheet for the antenna specifies that antenna should be placed at the corner of the board, and that minimum a T network is required for tuning:
regards
Jared
