Inductor device

An inductor device, comprising:

• a first winding in a first metal layer, wherein the first winding comprises a first coil and a second coil;
• a second winding in a second metal layer, wherein the second winding comprises a third coil and a fourth coil, the third coil is overlapped with the first coil vertically, and the fourth coil is overlapped with the second coil vertically;
• a first connecting structure comprising:
• a first crossing structure having a first crossing point and configured to directly couple the first coil and the second coil;
• and
• a second crossing structure having a second crossing point and configured to directly couple the third coil and the fourth coil, wherein the first crossing point is not overlapped with the second crossing point;
• and
• a second connecting structure configured to couple the second coil and the third coil;
• wherein the first winding further comprises a plurality of coils, and the inductor device further comprises:
• an input-output terminal configured to couple a outermost coil of the first winding, wherein the input-output terminal and the second connecting structure are located on a first side of the inductor device, the first connecting structure is located on a second side of the inductor device, and the first side is different from the second side;
• wherein the first coil comprises a first half coil and a second half coil, the second coil comprises a third half coil and a fourth half coil, the first half coil and the third half coil are located on a third side of the inductor device, the second half coil and the fourth half coil are located on a fourth side of the inductor device, and the third side is different from the fourth side.