High efficiency on-chip 3D transformer structure
AssigneeInternational Business Machines Corporation
InventorsRobert L. Barry, Venkata Nr. Vanukuru
Life of this patent
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Abstract
A transformer structure includes a first coil having two sections of spiral, with a top section including a plurality of metal layers occupying top X metal layers and a bottom section including a plurality of metal layers occupying bottom Z metal layers, where X and Z represent a number of metal layers having a specific number selected to provide a particular performance of the first coil. A second coil of the transformer is disposed between the two sections of the first coil and includes a plurality of metal layers where Y represents a number of vertically adjacent metal layers, with the specific number chosen to provide the particular performance, such that a sum X+Y+Z represents a total number of vertical metal layers for the transformer structure.
Claims4
A transformer structure, comprising:
- a first coil including two sections of spiral, with a top section including a plurality of metal layers occupying top X metal layers and a bottom section including a plurality of metal layers occupying bottom Z metal layers, where X and Z represent a number of metal layers having a specific number selected to provide a particular performance of the first coil;
- and
- a second coil of the transformer is disposed between the two sections of the first coil and including a plurality of metal layers where Y represents a number of vertically adjacent metal layers, with the specific number chosen to provide the particular performance, such that a sum X+Y+Z represents a total number of vertical metal layers for the transformer structure,
- wherein the top section includes one of a folded solenoid shape and a folded conical shape, each including a reversal of direction of a shape and a subsequent following of the shape in a reversed direction.
A transformer structure, comprising:
- a first coil including two sections of spiral, with a top section including a folded spiral occupying top X metal layers and a bottom section including a parallel stacked spiral occupying bottom Z metal layers, where X and Z represent a number of metal layers having a specific number selected to provide a particular performance;
- and
- a second coil of the transformer is disposed between the two sections of the first coil and including a parallel stacked spiral of Y metals with gradually decreasing width and increasing spacing from outermost turn to an innermost turn, where Y represents a number of vertically adjacent metal layers, with the specific number chosen to provide the particular performance, such that a sum X+Y+Z represents a total number of vertically adjacent metal layers for the transformer structure,
- wherein the folded spiral includes one of a folded solenoid shape and a folded conical shape, each including a reversal of direction of a shape and a subsequent following of the shape in a reversed direction.
Dependencies are inferred from the claim text.