Transformer device

A transformer device, comprising:

• a first coil comprising a first ring structure, a second ring structure, a first connecting portion, and a first terminal, wherein the first terminal is arranged on the first connecting portion and is located at a central location between the first ring structure and the second ring structure, the first terminal is connected to the first ring structure through the first connecting portion in a first direction, and connected to the second ring structure through the first connecting portion in a second direction, and the first direction is the opposite of the second direction;
• a second coil configured to couple the first ring structure;
• and
• a third coil configured to couple the second ring structure, wherein the second coil and the third coil have the same structure, and the first connection portion is arranged outside both of the second coil and third coil,
• wherein the first coil further comprises a second terminal and a second connecting portion, the second terminal is arranged on the second connecting portion and is located the central location between the first ring structure and the second ring structure, the second terminal is connected to the first ring structure through the second connecting portion in the first direction, and connected to the second ring structure through the second connecting portion in the second direction, and the first connecting portion and the second connecting portion are implemented with different metal layers and extend in the same direction.