Circuit boards, power adapters and notebook computers for reducing EMI characteristics

摘要

A circuit board for reducing EMI characteristics and a power adapter and a notebook computer having the circuit board are disclosed. The circuit board includes: a base board; an upper-site transistor having a power pin; and a lower-site transistor having a ground pin; wherein the upper-site transistor and the lower-site transistor are coupled to each other and placed next to each on the same side of the base board. The power pin and the ground pin are close to each other, and positions of the power pin and the ground pin form an angle that is substantially less than 90°.