I have a PCB with a bunch of relays on it. The purpose of the circuit, is to allow signals to pass through from one connector to another (db37), or to stop it - that's where the relays come in - to break the connection.
I have a 6 layer board with the following layer stack(signal, ground, signal, signal, power, signal).
I have +12V supply, +3.3V supply and +5V supply. The +12V is for a bunch of relays, and the +3.3V and +5V are for some microcontroller + other lower voltage ICs and components.
Some of these signals from the db37 connector MAY be higher current signals (3A) but with a frequency no more than 50khz. For the most part, we are looking at 10s of mA and 10Khz signals.
I'm using my power plane for the +12V.
My question is - can I just ground all my components to the ground plane directly or through a close proximity via or should be considering a star topology ?
Are star topologies only useful for situations where there is no dedicated ground plane ?
I suspect that because I have a dedicated ground, I should be able to simply just connect everything to ground. But PCB grounding is fairly new to me.