Symmetrical differential inductor

A symmetrical differential inductor, disposed on a substrate, comprising:

• a first spiral conducting wire, at least having a first outer conducting wire and a first inner conducting wire electrically connected in serial with each other, wherein the first inner conducting wire whirls in spiral fashion towards a central portion of a spiral structure of the first spiral conducting wire;
• and
• a second spiral conducting wire, at least having a second outer conducting wire and a second inner conducting wire electrically connected in serial with each other, wherein the second inner conducting wire whirls in spiral fashion towards a central portion of a spiral structure of the second spiral conducting wire and is connected to the first inner conducting wire of the first spiral conducting wire, and the second spiral conducting wire and the first spiral conducting wire are interwound with each other and symmetrical to a symmetrical plane, wherein
• the first outer conducting wire and the second outer conducting wire are disposed on a first height position corresponding to the substrate, the first inner conducting wire and the second inner conducting wire are disposed on a second height position corresponding to the substrate, and the first height position is higher than the second height position, and
• the first spiral conducting wire and the second spiral conducting wire enter the second height position from the first height position, at a staggering position of the first spiral conducting wire and the second spiral conducting wire.