Patent ID: 7420451

Claim:
A symmetrical differential inductor, disposed on a substrate, comprising: a first spiral conducting wire, having a first end and a second end, wherein the second end whirls in spiral fashion towards a central portion of a spiral structure of the first spiral conducting wire; and a second spiral conducting wire, having a third end and a fourth end, wherein the fourth end whirls in spiral fashion towards a central portion of a spiral structure of the second spiral conducting wire and is connected to the second end 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 when the first spiral conducting wire and the second spiral conducting wire whirl inside, and the first spiral conducting wire and the second spiral conducting wire having the same distance from the substrate are staggered, the first spiral conducting wire and the second spiral conducting wire extend towards the direction of the substrate to shorten the distances between the first spiral conducting wire and the second spiral conducting wire and the substrate.