Method for fabricating inductor device
First Claim
1. A method for forming an inductor device comprising:
- providing a semiconductor substrate;
forming a first planar spiral wiring over the semiconductor substrate;
forming a second planar spiral wiring over the first planar spiral wiring;
forming a third planar spiral wiring over the second planar spiral wiring, wherein each planar layer of the first, the second, and the third planar spiral wirings includes an outer spiral metal wiring and, an inner spiral metal wiring including at least two isolated sub-metal-lines each connecting to the outer spiral metal wiring such that the outer spiral metal wiring and the inner spiral metal wiring are connected in series in each corresponding planar layer, and the outer spiral metal wiring surrounds the inner spiral metal wiring in each corresponding planar layer;
connecting one sub-metal-line of the at least two isolated sub-metal-lines in each planar layer of the first, the second, and the third planar spiral wirings to one another; and
connecting the outer spiral metal wiring in the first planar spiral wiring to the outer spiral metal wiring in the third planar spiral wiring such that the first and the third planar spiral wirings are configured in parallel and the second planar spiral wiring is configured in series with the first and the third planar spiral wirings configured in parallel.
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Abstract
Various embodiments provide inductor devices and fabrication methods. An exemplary inductor device can include a plurality of planar spiral wirings isolated by a dielectric layer. The planar spiral wirings can be connected by conductive pads formed over the dielectric layer and by conductive plugs formed in the dielectric layer. In one embodiment, a third planar spiral wiring can be formed over a second planar spiral wirings that is formed over a first planar spiral wiring. The third planar spiral wiring can be configured in parallel with the first third planar spiral wiring. The second planar spiral wiring can be configured in series with the first and third planar spiral wirings configured in parallel.
14 Citations
19 Claims
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1. A method for forming an inductor device comprising:
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providing a semiconductor substrate; forming a first planar spiral wiring over the semiconductor substrate; forming a second planar spiral wiring over the first planar spiral wiring; forming a third planar spiral wiring over the second planar spiral wiring, wherein each planar layer of the first, the second, and the third planar spiral wirings includes an outer spiral metal wiring and, an inner spiral metal wiring including at least two isolated sub-metal-lines each connecting to the outer spiral metal wiring such that the outer spiral metal wiring and the inner spiral metal wiring are connected in series in each corresponding planar layer, and the outer spiral metal wiring surrounds the inner spiral metal wiring in each corresponding planar layer; connecting one sub-metal-line of the at least two isolated sub-metal-lines in each planar layer of the first, the second, and the third planar spiral wirings to one another; and connecting the outer spiral metal wiring in the first planar spiral wiring to the outer spiral metal wiring in the third planar spiral wiring such that the first and the third planar spiral wirings are configured in parallel and the second planar spiral wiring is configured in series with the first and the third planar spiral wirings configured in parallel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for forming an inductor device, comprising:
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providing a semiconductor substrate; forming a first planar spiral wiring over the semiconductor substrate; forming a second planar spiral wiring over the first planar spiral wiring; and forming a third planar spiral wiring over the second planar spiral wiring, wherein; a first planar layer of the first planar spiral wiring includes an outer spiral metal wiring including at least two isolated sub-metal-lines, and surrounding an inner spiral metal wiring, such that the outer spiral metal wiring and the inner spiral metal wiring are connected in series, the outer spiral metal wiring in the first planar layer is connected to a first outer contact layer, and the inner spiral metal wiring in the first planar layer is connected to a first inner contact layer, a second planar layer of the second planar spiral wiring includes an outer spiral metal wiring surrounding an inner spiral metal wiring including at least two isolated sub-metal-lines, such that the outer spiral metal wiring and the inner spiral metal wiring are connected in series, an inner sub-metal line of the inner spiral metal wiring in the second planar layer is connected to a second inner contact layer, and an outer sub-metal line of the inner spiral metal wiring is connected to a second outer contact layer, and a third planar layer of the third planar spiral wiring includes an outer spiral metal wiring including at least two isolated sub-metal-lines, and surrounding an inner spiral metal wiring, such that the outer spiral metal wiring and the inner spiral metal wiring are connected in series, the outer spiral metal wiring in the third planar layer is connected to a third outer contact layer, and the inner spiral metal wiring in the third planar layer is connected to a third inner contact layer. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification