Patent ID: 8198970

Claim:
A transformer, comprising: a primary coil assembly, including a plurality of primary coils formed in a plurality of metal layers, a first interlayer connection unit for connecting the primary coils, and first and second primary terminals for supplying energy to or receiving energy from the plurality of primary coils, at least one primary coil of the plurality of primary coils having at least one substantially continuous turn in at least one metal layer of the plurality of metal layers; and a secondary coil assembly, including a plurality of secondary coils formed in the plurality of metal layers, a second interlayer connection unit for connecting the secondary coils, and first and second secondary terminals for supplying energy to or receiving energy from the plurality of secondary coils, at least one secondary coil of the plurality of secondary coils having at least one substantially continuous turn in the at least one metal layer; wherein the primary and secondary coils formed in a same metal layer of the plurality of metal layers are concentric and axisymmetric with respect to a diameter line passing through a planar center point, wherein the first primary terminal is in a different metal layer than the second primary terminal, and wherein the first secondary terminal is in a different metal layer than the second secondary terminal.