High efficiency on-chip 3D transformer structure
First Claim
1. A transformer structure, comprising:
- a first coil including two sections of spiral, with a top section including a plurality of metal layers with a folded spiral 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 folded spiral includes a reversal of direction of a shape and a subsequent following of the shape in a reversed direction.
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Accused Products
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.
41 Citations
20 Claims
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1. A transformer structure, comprising:
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a first coil including two sections of spiral, with a top section including a plurality of metal layers with a folded spiral 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 folded spiral includes a reversal of direction of a shape and a subsequent following of the shape in a reversed direction. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A transformer structure, comprising:
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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 a reversal of direction of a shape and a subsequent following of the shape in a reversed direction. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification