Integrated inductor for integrated circuit devices
First Claim
1. A method, comprising:
- forming first and second turns of a first through-body-via-based inductor in a die having a back side and a front side of the die, the inductor first turn forming comprising;
forming first and second conductive through-body-vias passing through the body of the die from the front side of the die to the back side of the die, said first and second through-body-vias each having a front side end at the front side of the die and said first and second through-body-vias each having a back side end at the back side of the die;
wherein the forming first and second through-body-vias includes;
forming first and second through-body passageways passing through the body of the die from the front side of the die to the back side of the die; and
depositing conductive metal in said first and second through-body passageways from the front side of the die to the back side of the die to form said first and second conductive through-body-vias; and
wherein said forming first and second through-body passageways comprises;
removing semiconductor material from the body of the die from the front side of the die to the back side of the die;
replacing removed semiconductor material with insulative material to form a plug of insulative material within the body of the die; and
removing insulative material from the plug; and
forming a transformer including forming first and second turns of a second through-body-via-based inductor in the die; and
interwinding the first and second turns of the first and second through-body-via-based inductors so that the first and second through-body-via-based inductors are inductively coupled together and share a core in the die body.
1 Assignment
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Accused Products
Abstract
A three-dimensional inductor is formed in an integrated circuit die using conductive through-body-vias which pass through the body of the die and contact one or more metal interconnect layers on the front side of the die and terminate on the back side of the die. In another embodiment, the through-body-vias may pass through a dielectric material disposed in a plug in the body of the die. In yet another aspect, a transformer may be formed by coupling multiple inductors formed using through-body-vias. In still another aspect, a three-dimensional inductor may include conductors formed of stacks of on chip metallization layers and conductive through-layer-vias disposed in insulation layers between metallization layers. Other embodiments are described.
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Citations
10 Claims
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1. A method, comprising:
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forming first and second turns of a first through-body-via-based inductor in a die having a back side and a front side of the die, the inductor first turn forming comprising; forming first and second conductive through-body-vias passing through the body of the die from the front side of the die to the back side of the die, said first and second through-body-vias each having a front side end at the front side of the die and said first and second through-body-vias each having a back side end at the back side of the die; wherein the forming first and second through-body-vias includes; forming first and second through-body passageways passing through the body of the die from the front side of the die to the back side of the die; and depositing conductive metal in said first and second through-body passageways from the front side of the die to the back side of the die to form said first and second conductive through-body-vias; and wherein said forming first and second through-body passageways comprises; removing semiconductor material from the body of the die from the front side of the die to the back side of the die; replacing removed semiconductor material with insulative material to form a plug of insulative material within the body of the die; and removing insulative material from the plug; and forming a transformer including forming first and second turns of a second through-body-via-based inductor in the die; and interwinding the first and second turns of the first and second through-body-via-based inductors so that the first and second through-body-via-based inductors are inductively coupled together and share a core in the die body. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification