PCB design layout review

[Kapil Rawat]

Hi

I'm using nrf51822 & PCB antenna due to size constraint I changed antenna direction (edit library file) so that it will fit within size. Also, components placement slightly different as recommended.

Please review my design

Here are top & bottom layer

edit: I'm attaching updated layout

[AmbystomaLabs]

While I'm in commenting mode, you should get your ground vias under the 51822 a little more uniform. They are off to one side of the part. Again look the the image I pasted into my answer for some nice looking ground vias.

Also the ground pad on the 51822 is too close to the part pins. Again look to the pasted image. Also, you can refer to the Nordic reference design for how the footprint on a QFN should look.

[AmbystomaLabs]

You have a lot of shared ground connections going on by the crystal. Not a good practice since this will lead to coupling between the connections. In this case that would mean RF getting into the 16MHz section or 16MHz getting into DEC1.

[tamojit]

Hi AmbystomaLabs
Can you also have a look at my board layout here and give your valuable suggestions?

[AmbystomaLabs]

See my comments in your original post.