Embedded toroidal inductor
First Claim
1. A method for forming an inductor, comprising:
- forming in a substrate a first plurality of conductive vias radially spaced a first distance from a central axis so as to define a first inner circumference;
forming in said substrate a second plurality of conductive vias radially spaced a second distance from said central axis so as to define a second inner circumference, said second distance greater than said first distance;
forming in said substrate a third plurality of conductive vias radially spaced a third distance from said central axis so as to define an outer circumference, said third distance greater than said second distance;
forming a first plurality of conductive traces disposed in a first plane defined orthogonal to said central axis, said first plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said first and third plurality of conductive vias;
forming a second plurality of conductive traces disposed in said first plane, said second plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said second and third plurality of conductive vias;
forming a third plurality of conductive traces disposed in a second plane spaced from said first plane and defined orthogonal to said central axis to define an electrical connection between circumferentially offset ones of said first and third plurality of conductive vias;
forming a fourth plurality of conductive traces disposed in said second plane to define an electrical connection between circumferentially offset ones of said second and third plurality of conductive vias to define a three dimensional toroidal coil.
1 Assignment
0 Petitions
Accused Products
Abstract
A toroidal inductor, including a substrate (100), a toroidal core region (434) defined within the substrate, and a toroidal coil including a first plurality of turns formed about the toroidal core region and a second plurality of turns formed about the toroidal core region. The second plurality of turns can define a cross sectional area (440) greater than a cross sectional area (442) defined by the first plurality of turns. The substrate and the toroidal coil can be formed in a co-firing process to form an integral substrate structure with the toroidal coil at least partially embedded therein. The first and second plurality of turns can be disposed in alternating succession. The toroidal core region can be formed of a substrate material having a permeability greater than at least one other portion of the substrate.
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Citations
34 Claims
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1. A method for forming an inductor, comprising:
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forming in a substrate a first plurality of conductive vias radially spaced a first distance from a central axis so as to define a first inner circumference;
forming in said substrate a second plurality of conductive vias radially spaced a second distance from said central axis so as to define a second inner circumference, said second distance greater than said first distance;
forming in said substrate a third plurality of conductive vias radially spaced a third distance from said central axis so as to define an outer circumference, said third distance greater than said second distance;
forming a first plurality of conductive traces disposed in a first plane defined orthogonal to said central axis, said first plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said first and third plurality of conductive vias;
forming a second plurality of conductive traces disposed in said first plane, said second plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said second and third plurality of conductive vias;
forming a third plurality of conductive traces disposed in a second plane spaced from said first plane and defined orthogonal to said central axis to define an electrical connection between circumferentially offset ones of said first and third plurality of conductive vias;
forming a fourth plurality of conductive traces disposed in said second plane to define an electrical connection between circumferentially offset ones of said second and third plurality of conductive vias to define a three dimensional toroidal coil. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An inductor, comprising:
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a first plurality of conductive vias formed in a substrate and radially spaced a first distance from a central axis so as to define a first inner circumference;
a second plurality of conductive vias formed in said substrate and radially spaced a second distance from said central axis so as to define a second inner circumference, said second distance greater than said first distance;
a third plurality of conductive vias formed in said substrate and radially spaced a third distance from said central axis so as to define an outer circumference, said third distance greater than said second distance;
a first plurality of conductive traces disposed in a first plane defined orthogonal to said central axis, said first plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said first and third plurality of conductive vias;
a second plurality of conductive traces disposed in said first plane, said second plurality of conductive traces forming an electrical connection between substantially radially adjacent ones of said second and third plurality of conductive vias;
a third plurality of conductive traces disposed in a second plane spaced from said first plane and defined orthogonal to said central axis to define an electrical connection between circumferentially offset ones of said first and third plurality of conductive vias;
a fourth plurality of conductive traces disposed in said second plane to define an electrical connection between circumferentially offset ones of said second and third plurality of conductive vias to define a three dimensional toroidal coil. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A printed circuit board, comprising:
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a substrate;
a toroidal core region defined within said substrate; and
a toroidal coil comprising a first plurality of turns formed about said toroidal core region and a second plurality of turns formed about said toroidal core region, said second plurality of turns defining a cross sectional area greater than a cross sectional area defined by said first plurality of turns. - View Dependent Claims (20, 21, 22, 23, 24)
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25. A method for forming an inductor in a substrate, comprising:
forming a toroidal coil comprising a first plurality of turns about a toroidal core region defined in said substrate and a second plurality of turns about said toroidal core region, said second plurality of turns defining a cross sectional area greater than a cross sectional area defined by said first plurality of turns. - View Dependent Claims (26, 27, 28, 29)
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30. A toroidal inductor, comprising:
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a substrate;
a toroidal core region defined within said substrate; and
a toroidal coil comprising a first plurality of turns formed about said toroidal core region and a second plurality of turns formed about said toroidal core region, said second plurality of turns defining a cross sectional area greater than a cross sectional area defined by said first plurality of turns. - View Dependent Claims (31, 32, 33, 34)
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Specification