I am designing a little mezzanine PCB that uses Hirose DF12 connectors to connect to the motherboard.
Four different voltages are delivered to this PCB: ±10v, 3.3v, 48v (and ground). They go through one of the DF12 connectors.
Which of these two ways is the preferred way to lay out the power and ground connections on the connector?
First way: Each power has its own ground.
Second way: Single set of ground shared by all power.