The best way of minimizing ground impedance in a multicard system is to use another PCB as a backplane and have a ground plane (or even two - one analog, one digital) on that mother card.

• 为了降低多板连接的地线阻抗，最好的办法是专门设计一块背板（母板），并且背板上要设置接地面（甚至设置模拟地和数字地两个接地面）。