Circuit board and electronic assembly

An electronic assembly, comprising:

• an electronic package;
• a circuit board electrically connected to the electronic package, wherein the circuit board has a circuit board surface, the circuit board surface has a package region corresponding to the electronic package, the package region is rectangular and has four sides, and the circuit board comprises:
• a power layer comprising a first power plane, a second power plane, a third power plane, and a fourth power plane, wherein an orthographic projection of the first power plane on the circuit board surface extends from an outside of the package region into the package region and extends through at least one of the sides,
• an orthographic projection of the second power plane on the circuit board surface extends from the outside of the package region into the package region and extends through at least three of the sides,
• an orthographic projection of the third power plane on the circuit board surface extends from the outside of the package region into the package region and extends through at least one of the sides,
• an orthographic projection of the fourth power plane on the circuit board surface extends from the outside of the package region into the package region and extends through at least one of the sides,
• an area of the orthographic projection of the second power plane on the circuit board surface in the package region is greater than an area of the orthographic projections of each of the first power plane, the third power plane, and the fourth power plane on the circuit board surface in the package region, and
• at least one of the sides through which the orthographic projection of the first power plane on the circuit board surface extends is the same as one of the sides through which the orthographic projection of the third power plane on the circuit board surface extends, and at least one of the sides through which the orthographic projection of the first power plane on the circuit board surface extends is the same as one of the sides through which the orthographic projection of the fourth power plane on the circuit board surface extends.