Reduced eddy current loss in LC tank circuits
First Claim
1. An apparatus formed in a planar technology comprising:
- at least one metallic conductor;
at least one cross-under;
an eddy current loss; and
at least one space that is devoid of metal;
whereineach space partitions a portion of the metallic conductor into at least two parallel conductor paths causing the eddy current loss to decrease.
5 Assignments
0 Petitions
Reexamination
Accused Products
Abstract
Placing inductors or resistors in parallel causes the combined value of inductance or resistance to decrease according to the parallel combination rule. This invention decreases the parasitic resistance of an inductor by placing several inductors in parallel. Furthermore, by careful placement of these inductors, the mutual inductance between these inductors can be used to increase the equivalent inductance value to a value near that of the original inductance value of a single inductor. Thus, it is possible to create an inductance with a much lower value of parasitic resistance. This invention allows the formation of high Q inductors and would be beneficial in any circuit design requiring inductances. Another aspect of this invention is that the coils can be partitioned to minimize eddy current losses. This invention can easily be implemented in a planar technology. Simulations of several tank circuits indicate that the power dissipation can be reduced 3 to 4 times when compared to conventional techniques.
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Citations
37 Claims
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1. An apparatus formed in a planar technology comprising:
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at least one metallic conductor; at least one cross-under; an eddy current loss; and at least one space that is devoid of metal;
whereineach space partitions a portion of the metallic conductor into at least two parallel conductor paths causing the eddy current loss to decrease. - View Dependent Claims (2, 3, 4)
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- 5. The apparatus of clam 1 wherein one or more metallic conductors are used to form an inductor.
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9. A method of decreasing an eddy current loss within an apparatus formed in a planar technology comprising the steps of:
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forming a metallic conductor with at least one cross-under; creating at least one space that is devoid of metal; and positioning the first space to partition a portion of the metallic conductor into at least two parallel conductor paths;
therebydecreasing the eddy current loss within the apparatus.
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17. An apparatus comprising:
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one or more metal layers; a plurality of metallic connections; an eddy current loss; a plurality of metallic conductors formed in at least one of the metal layers where each metallic conductor has a corresponding first lead and a corresponding second lead; the corresponding first leads of the metallic conductors are connected together using the first metallic connection; and the corresponding second leads of the metallic conductors are connected together using the second metallic connection wherein at least one metallic conductor contains at least one cross-under. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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18. The apparatus of claim l7 wherein at least two of the metallic conductors are magnetically coupled to each other.
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29. A composite inductor comprising:
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a MCM (Multi Chip Modules) formed using at least two substrates; a first lead electrically connected to opposing substrates via a first solder bump; at least one other lead electrically connected to the opposing substrates via an other solder bump; two or more inductors each with a corresponding width; each inductor is coupled between the first lead and the other lead; at least one of the two inductors has at least one cross-under; at least one of the two inductors is located in the opposing substrate; and the two or more inductors form the composite inductor having a combined width equal to the summation of the corresponding widths;
whereinan eddy current loss within the composite inductor is reduced since each of the corresponding widths are less than the combined width of the composite inductor. - View Dependent Claims (30, 31, 32, 33)
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34. An oscillator with an eddy current loss comprising:
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at least one capacitor; one or more planar inductors with a corresponding width; at least one inductor has at least one cross-under; means for forming a tank circuit using the at least one planar inductor and the at least one capacitor; means for connecting a regenerative circuit to the tank circuit; at least one addition planar inductor placed in parallel to the first planar inductor; the two or more planar inductors form a composite inductor; the composite inductor has a combined width determined by summing all corresponding metallic widths;
whereinan eddy current loss within the composite inductor is reduced since each of the corresponding widths are less than the combined width of the composite inductor. - View Dependent Claims (35, 36, 37)
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Specification