I know there are multiple questions about this topic, but I didn't found an exact answer to my question.
My situation: I'm having a 2 layer PCB. On the PCB there are multiple SMD components and traces both of them on the top and on the bottom side. All signals and power traces (+5V and +3V3) are already routed. Now my idea was to create a ground plane: one on the top and one on the bottom layer.
- Is it a good idea to have a ground plane on both layers?
- Should the ground planes be connected with vias or is it enough that they are connected through the GND pads of my USB and Ethernet connector?
If anyone needs additional information, please write a comment and I will try to provide this information.
Edit: I want to add some future details about the PCB. The PCB has a size of about 60x60mm. The main components on the board are a microcontroller from Microchip (PIC32MZ) and a ethernet PHY from Texas Instruments (DP83848). Furthermore the board contains a USB-B and ethernet port. The 5V from the USB port is used as the power supply of the device.