Layout of power device

A layout of a power device, comprising:

• a substrate;
• a unit array, disposed on the substrate, wherein the unit array has a plurality of rows and each row comprises a plurality of units;
• a plurality of first signal paths, disposed on the substrate, wherein the first signal paths are disposed on a first side of corresponding odd-numbered rows of the unit array;
• a plurality of second signal paths, disposed on the substrate, wherein the second signal paths are disposed on a second side of corresponding odd-numbered rows of the unit array;
• a plurality of third signal paths, disposed on the substrate, wherein the third signal paths are disposed over corresponding rows of the unit array;
• a plurality of fourth signal paths, disposed on the substrate, wherein the fourth signal paths are disposed over corresponding rows of the unit array;
• a first port, disposed on the substrate and electrically connected to the first signal paths;
• a second port, disposed on the substrate and electrically connected to the second signal paths;
• a third port, disposed on the substrate and electrically connected to the third signal paths;
• and
• a fourth port, disposed on the substrate and electrically connected to the fourth signal paths.