I'm working on a 2 layer PCB with very poor grounding. I want to improve it but I'm a little lost. Basically the PCB as a DC input, a couple of buck converters and some communication signaling like USB, UART, etc that goes to connectors for external devices.
There are no controllers, procesors or RF devices on the board.
Any tips, ideas, application notes, books, etc would be greately appreciated.