High efficiency on-chip 3d transformer structure

An integrated circuit transformer structure, comprising:

• at least two conductor groups, each conductor group forming a spiral, the spirals of the at least two conductor groups being stacked in parallel in different layers;
• the spirals including:
• turns of a first radius connected in series between the layers to form a first cylinder of turns within the at least two conductor groups;
• turns of a second radius connected in series between the layers to form a second cylinder of turns within the at least two conductor groups;
• and
• turns of a third radius connected in series between the layers to form a third cylinder of turns within the at least two conductor groups, wherein the first and the third cylinder are electrically connected to each other and electrically isolated from the second cylinder, the second cylinder including a plurality of adjacent turns of one or more radii in each of the at least two conductor groups and disposed in a same plane between turns of the first and third cylinders in each of the at least two conductor groups.

A transformer structure, comprising:

• at least two conductor groups, each conductor group forming a spiral, the spirals of the at least two conductor groups being stacked in parallel in different layers;
• a first spiral track including first sets of turns of one or more radii in all the different layers, the first sets of turns of one or more radii being connected in series between the layers;
• and
• a second spiral track including second sets of turns of one or more radii in all the different layers, connected in series between the layers such that second sets of turns are disposed between first sets of turns within each plane of the layers in an alternating pattern and all first sets of turns are electrically connected and all second sets of turns are electrically connected.