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High efficiency on-chip 3D transformer structure

  • US 9,831,026 B2
  • Filed: 07/24/2013
  • Issued: 11/28/2017
  • Est. Priority Date: 07/24/2013
  • Status: Active Grant
First Claim
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1. A transformer structure, comprising:

  • at least three sections, each corresponding to metal layers of an integrated circuit, the at least three sections including;

    a first section of the at least three sections being electrically coupled to a third section with a second section disposed between the first and third sections,wherein the at least three sections including inductor coils, all of which are wound in a same direction and voltage phase starting at an outer terminal and continuing to an inner terminal of each inductor coil;

    a first wire electrically coupling an inner terminal of the inductor coil of the first section to a first intermediate terminal of the third section;

    a second wire electrically coupling an inner terminal of the inductor coil of the second section to a second intermediate terminal of the third section, the second intermediate terminal of the third section distinct from the first intermediate terminal of the third section;

    a break formed through a portion of the inductor coil of the third section of the at least three sections; and

    a plurality of radial connections positioned within the break formed through the portion of the inductor coil of the third section, the plurality of radial connections including;

    a first radial connection extending between the first intermediate terminal of the third section to the outer terminal of the inductor coil of the third section, the first radial connection electrically coupling the inner terminal of the inductor coil of the first section to the outer terminal of the inductor coil of the third section; and

    a second radial connection extending from the second intermediate terminal of the third section to an exterior of the transformer structure, the second radial connection providing electrical accessibility to the inner terminal of the inductor coil of the second section from the exterior of the transformer structure.

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