Return currents on a 4 layer board

[Kostas_P]

Hi Everyone,

I have a four layer board with the following layer stack:

L1: Signals
L2: Solid GND
L3: Solid 3.3V
L4: Signals

The signals i am routing on L4 are UARTs, I2C and SPI.

Do you think i will need to be adding capacitors close to vias every time i change layer from 1 to 4 and vice versa?

Thank you.

Kostas.

[robertferanec]

Personally, I would not - especially if these are 3.3V signals.