Two layer transformer
First Claim
1. A symmetrical transformer with a stacked coil structure comprising a primary and a secondary coil each having at least two turns, the primary and secondary coils being located in a first and a second conductive plane which are electrically isolated from each other by an intermediate dielectric layer, the primary and secondary coils being electrically isolated from each other and being arranged so that magnetic coupling takes place between them, whereinthe structure comprises four identical basic elements, each basic element providing a conductive path for part of said coilsthe first conductive plane comprising a first of said basic elements and a second of said basic elements electrically isolated from each other, the first basic element providing half of the turns and a first terminal of the primary coil, the second basic element providing half of the turns and a second terminal of the secondary coil, the first terminal of the primary coil and the second terminal of the secondary coil being located on opposite sides of the structure,the second conductive plane comprising a third of said basic elements and a fourth of said basic elements electrically isolated from each other, the third basic element providing half of the turns and a third terminal of the secondary coil, the fourth basic element providing half of the turns and a fourth terminal of the primary coil, the fourth terminal of the primary coil and the third terminal of the secondary coil being located on opposite sides of the structure,the first and fourth terminal of said primary coil being located on the same side of the structure and in different planes from one another,the second and third terminal of said secondary coil being located on the same side of the structure and in different planes from one another,an end of the first basic element being electrically connected to an end of the fourth basic element by a first connection through the dielectric layer,an end of the second basic element being electrically connected to an end of the third basic element by a second connection through the dielectric layer.
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Accused Products
Abstract
One aspect of the invention relates to a symmetrical transformer with a stacked coil structure comprising two coils each having at least two turns. The coils are located in two conductive planes. The structure includes four identical basic elements, each basic element providing a conductive path for part of the coils. The terminals of the transformer are located at opposite sites of the structure so that the structure can be easily connected in a chain. The invention also relates to a semiconductor device comprising such a structure.
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Citations
9 Claims
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1. A symmetrical transformer with a stacked coil structure comprising a primary and a secondary coil each having at least two turns, the primary and secondary coils being located in a first and a second conductive plane which are electrically isolated from each other by an intermediate dielectric layer, the primary and secondary coils being electrically isolated from each other and being arranged so that magnetic coupling takes place between them, wherein
the structure comprises four identical basic elements, each basic element providing a conductive path for part of said coils the first conductive plane comprising a first of said basic elements and a second of said basic elements electrically isolated from each other, the first basic element providing half of the turns and a first terminal of the primary coil, the second basic element providing half of the turns and a second terminal of the secondary coil, the first terminal of the primary coil and the second terminal of the secondary coil being located on opposite sides of the structure, the second conductive plane comprising a third of said basic elements and a fourth of said basic elements electrically isolated from each other, the third basic element providing half of the turns and a third terminal of the secondary coil, the fourth basic element providing half of the turns and a fourth terminal of the primary coil, the fourth terminal of the primary coil and the third terminal of the secondary coil being located on opposite sides of the structure, the first and fourth terminal of said primary coil being located on the same side of the structure and in different planes from one another, the second and third terminal of said secondary coil being located on the same side of the structure and in different planes from one another, an end of the first basic element being electrically connected to an end of the fourth basic element by a first connection through the dielectric layer, an end of the second basic element being electrically connected to an end of the third basic element by a second connection through the dielectric layer.
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7. A semiconductor device comprising a symmetrical transformer integrated on a chip, the symmetrical transformer having a stacked coil structure comprising a primary and a secondary coil each having at least two turns, the primary and secondary coils being located in a first and a second conductive plane which are electrically isolated from each other by an intermediate dielectric layer, the primary and secondary coils being electrically isolated from each other and being arranged so that magnetic coupling takes place between them, wherein
the structure comprises four identical basic elements, each basic element providing a conductive path for part of said coils the first conductive plane comprising a first of said basic elements and a second of said basic elements electrically isolated from each other, the first basic element providing half of the turns and a first terminal of the primary coil, the second basic element providing half of the turns and a second terminal of the secondary coil, the first terminal of the primary coil and the second terminal of the secondary coil being located on opposite sides of the structure, the second conductive plane comprising a third of said basic elements and a fourth of said basic elements electrically isolated from each other, the third basic element providing half of the turns and a third terminal of the secondary coil, the fourth basic element providing half of the turns and a fourth terminal of the primary coil, the fourth terminal of the primary coil and the third terminal of the secondary coil being located on opposite sides of the structure, the first and fourth terminal of said primary coil being located on the same side of the structure and in different planes from one another, the second and third terminal of said secondary coil being located on the same side of the structure and in different planes from one another, an end of the first basic element being electrically connected to an end of the fourth basic element by a first connection through the dielectric layer, an end of the second basic element being electrically connected to an end of the third basic element by a second connection through the dielectric layer, wherein the conductive planes are metal planes.
Specification