Patent ID: 8665052

Claim:
A transformer-based circuit, having at least a first port and a plurality of second ports, the transformer-based circuit comprising: a first winding conductor, electrically connected to the first port, the first winding conductor having a plurality of sectors connected in series to thereby form a plurality of loops, wherein the loops are arranged in a concentric-like fashion; and a plurality of second winding conductors, magnetically coupled to the first winding conductor, wherein the second winding conductors are electrically connected to the second ports, respectively, each of the second winding conductors is routed on a plurality of metal layers, and includes a plurality of layout patterns on the metal layers, respectively, where regarding each of the metal layers, layout patterns of the second winding conductors on a same metal layer are identical to each other; wherein the first winding conductor acts as one of a primary winding conductor and a secondary winding conductor, and each of the second winding conductors acts as the other of the primary winding conductor and the secondary winding conductor.