CN110033920B

CN110033920B - Stacked inductor device

Info

Publication number: CN110033920B
Application number: CN201810025775.2A
Authority: CN
Inventors: 颜孝璁
Original assignee: Realtek Semiconductor Corp
Current assignee: Realtek Semiconductor Corp
Priority date: 2018-01-11
Filing date: 2018-01-11
Publication date: 2021-11-02
Anticipated expiration: 2038-01-11
Also published as: CN110033920A

Abstract

A stacked inductor device includes a first inductor unit and a second inductor unit disposed above the first inductor unit. The first inductance unit comprises a first coil and a second coil. The first coil is arranged on the first side of the first inductance unit. The second coil is configured at the second side of the first inductance unit. The first opening of the second coil is disposed on the first side of the stacked inductor device. The second inductance unit includes a third coil and a fourth coil. The third coil is disposed on a first side of the second inductance unit, and the first side of the second inductance unit corresponds to the first side of the first inductance unit. The second opening of the third coil is disposed at the second side of the stacked inductor device. The fourth coil is disposed on the second side of the second inductance unit, and the second side of the second inductance unit corresponds to the second side of the first inductance unit.

Description

Stacked inductor device

Technical Field

The present disclosure relates to an inductor, and more particularly, to a stacked inductor device.

Background

Various types of conventional inductors, such as helical-type inductors, have advantages and disadvantages, such as a high Q value and a large mutual inductance value, which occur between coils, and a splay inductor, which has a coupling magnetic field generated in another coil due to the opposite direction of the two coils, and occupies a large area in the device. Moreover, although the stacked transformer occupies a smaller area, the quality factor of the stacked transformer cannot be optimized compared to other transformers, and thus the application range of the inductor/transformer is limited.

It is apparent that there are inconveniences and disadvantages to the above-described conventional method, and improvements are desired. In order to solve the above problems, the related art has not been able to make a thorough effort to solve the above problems, but appropriate solutions have not been developed for a long time.

Disclosure of Invention

This summary is provided to provide a simplified summary of the disclosure in order to provide a basic understanding to the reader. This summary is not an extensive overview of the disclosure and is intended to neither identify key/critical elements of the embodiments nor delineate the scope of the embodiments.

An object of the present invention is to provide a stacked inductor device to improve the problems of the prior art.

To achieve the above objective, one aspect of the present invention relates to a stacked inductor device, which includes a first inductor unit and a second inductor unit. The second inductance unit is arranged on the first inductance unit. The first inductance unit comprises a first coil and a second coil. The first coil is arranged on the first side of the first inductance unit. The second coil is disposed on a second side of the first inductance unit opposite to the first side. The second coil includes a first opening disposed at a first side of the stacked inductor device. The second inductance unit includes a third coil and a fourth coil. The third coil is disposed on a first side of the second inductance unit, and the first side of the second inductance unit corresponds to the first side of the first inductance unit. The third coil includes a second opening disposed on a second side of the stacked inductor device opposite to the first side. The fourth coil is disposed on a second side of the second inductance unit opposite to the first side, and the second side of the second inductance unit corresponds to the second side of the first inductance unit.

Therefore, according to the technical content of the present disclosure, the embodiments of the present disclosure provide a stacked inductor device, so as to achieve better electrical characteristics.

The basic spirit and other objects of the present invention, as well as the technical means and embodiments adopted by the present invention, will be readily understood by those skilled in the art after considering the following embodiments.

Drawings

In order to make the aforementioned and other objects, features, advantages and embodiments of the present invention comprehensible, the following description is made with reference to the accompanying drawings:

fig. 1 is a schematic diagram illustrating a stacked inductor device according to an embodiment of the present disclosure.

Fig. 2 is a schematic diagram illustrating a partial structure of the stacked inductor device shown in fig. 1 according to another embodiment of the disclosure.

Fig. 3 is a schematic partial structural diagram illustrating a stacked inductor device shown in fig. 1 according to yet another embodiment of the disclosure.

Fig. 4 is a schematic diagram illustrating a partial structure of the stacked inductor device shown in fig. 1 according to yet another embodiment of the present disclosure.

Fig. 5 is a schematic diagram illustrating a partial structure of the stacked inductor device shown in fig. 1 according to another embodiment of the present disclosure.

Fig. 6 is a schematic diagram illustrating a stacked inductor device according to an embodiment of the present disclosure.

Fig. 7 is a graph illustrating experimental data of a stacked inductor device according to an embodiment of the present disclosure.

In accordance with conventional practice, the various features and elements of the drawings are not drawn to scale in order to best illustrate the specific features and elements associated with the present disclosure. Moreover, the same or similar reference numbers are used throughout the different drawings to refer to similar elements/components.

[ notation ] to show

1000: stacked inductor device

1000A: stacked inductor device

1100. 1100A: first inductance unit

1110. 1110A: first coil

1112: first ring

1114: second ring

1116: at the crossed coupling part

1120. 1120A: second coil

1122: third ring

1124: the fourth ring

1126: at the crossed coupling part

1128: first opening

1130: first interlaced member

1190: adjacent place

1192: first cross coupling point

1194: a first coupling section

1200. 1200A: second inductance unit

1210. 1210A: third coil

1212: second opening

1214. 1214A: first winding piece

1220. 1220A: fourth coil

1224. 1224A: second winding device

1230: second interlaced part

1290: adjacent place

1292: second cross coupling point

1294: second coupling section

C1, C2, C3, C4: curve line

Detailed Description

In order to make the disclosure more thorough and complete, illustrative descriptions are provided below for embodiments and specific examples of the disclosure; it is not intended to be exhaustive or to limit the invention to the precise form disclosed. The embodiments are intended to cover the features of the various embodiments as well as the method steps and sequences for constructing and operating the embodiments. However, other embodiments may be utilized to achieve the same or equivalent functions and step sequences.

Unless defined otherwise herein, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Furthermore, as used herein, the singular tense of a noun, unless otherwise conflicting with context, encompasses the plural form of that noun; the use of plural nouns also covers the singular form of such nouns.

Further, as used herein, coupled refers to two or more elements being in direct or indirect physical or electrical contact with each other, and also refers to two or more elements being in mutual operation or action.

Fig. 1 is a schematic diagram illustrating a stacked inductor device 1000 according to an embodiment of the present disclosure. It should be noted that the stacked inductor device 1000 shown in fig. 1 is an integral structure formed by stacking the first inductor unit 1100 and the second inductor unit 1200 included therein (the openings of the first inductor unit 1100 and the second inductor unit 1200 are labeled in the figure to distinguish the two). In order to make the structure of the stacked inductor 1000 easy to understand, the structure of the first inductor unit 1100 and the second inductor unit 1200 shown in fig. 2 and fig. 3 are disassembled and drawn, and the following description is made in detail. It should be noted that although the openings of the first inductance unit 1100 and the second inductance unit 1200 are shown in fig. 1 as being located at the upper and lower sides, in detail, the opening of the first inductance unit 1100 is located at the upper right side in the figure, and the opening of the second inductance unit 1200 is located at the lower left side in the figure. However, the present disclosure is not limited thereto, and the openings of the first inductance unit 1100 and the second inductance unit 1200 may be disposed on the left and right sides according to actual requirements, for example, the opening of the first inductance unit 1100 may be disposed on the right side in the figure by rotating 90 degrees (e.g., rotating 90 degrees clockwise), and the opening of the second inductance unit 1200 may be disposed on the left side in the figure by rotating 90 degrees (e.g., rotating 90 degrees clockwise).

Fig. 2 is a schematic diagram illustrating a partial structure of the stacked inductor 1000 shown in fig. 1 according to another embodiment of the disclosure. As shown, the first inductance unit 1100 of the stacked inductance device 1000 is shown, and the first inductance unit 1100 includes a first coil 1110 and a second coil 1120. Structurally, the first coil 1110 is disposed on a first side (e.g., left side) of the first inductive unit 1100. The second coil 1120 is disposed on a second side (right side in the figure) of the first inductive unit 1100 opposite to the first side. In addition, the second coil 1120 includes a first opening 1128 disposed on a first side (e.g., upper side in the drawing) corresponding to the stacked inductor apparatus 1000 of fig. 1.

Fig. 3 is a schematic partial structure diagram illustrating a stacked inductor 1000 shown in fig. 1 according to yet another embodiment of the disclosure. As shown, the second inductance unit 1200 of the stacked inductance device 1000 is shown, and the second inductance unit 1200 is disposed on the first inductance unit 1100 of fig. 2 to form the stacked inductance device 1000 shown in fig. 1. The second inductance unit 1200 includes a third coil 1210 and a fourth coil 1220. Structurally, the third coil 1210 is disposed on a first side (e.g., left side) of the second inductance unit 1200, and the first side of the second inductance unit 1200 corresponds to the first side of the first inductance unit 1100 of fig. 2. The third coil 1210 includes a second opening 1212 disposed at a second side (lower side in the drawing) opposite to the first side corresponding to the stacked inductor apparatus 1000 of fig. 1. In addition, the fourth coil 1220 is disposed on a second side (right side in the figure) of the second inductance unit 1200 opposite to the first side, and the second side of the second inductance unit 1200 corresponds to the second side of the first inductance unit 1100 of fig. 2.

In an embodiment, the first inductor unit 1100 shown in fig. 2 is disposed on a first metal layer, and the second inductor unit 1200 shown in fig. 3 is disposed on a second metal layer located on the first metal layer. In another embodiment, the first Metal Layer may be, but is not limited to, an Ultra Thick Metal (UTM) Layer and the second Metal Layer may be, but is not limited to, a Re-Distribution Layer (RDL).

Referring to fig. 2 and 3, in some embodiments, the first coil 1110 and the second coil 1120 are cross-coupled at a position 1190 adjacent to each other. In addition, the third coil 1210 and the fourth coil 1220 are cross-coupled adjacent 1290.

Referring to fig. 2 and 3, in some embodiments, the first coil 1110 and the second coil 1120 are cross-coupled at a neighboring point 1190 to a first cross-coupling point 1192. In addition, the third coil 1210 and the fourth coil 1220 are alternately coupled to a second alternate coupling point 1292 at a neighboring point 1290. Referring back to fig. 1, the first cross-coupling point 1192 and the second cross-coupling point 1292 do not overlap.

In one embodiment, referring to fig. 2, the first coil 1110 and the second coil 1120 are coupled to the first coupling segment 1194. In addition, the first inductive unit 1100 further includes a first cross-piece 1130, and the first cross-piece 1130 crosses the first coupling segment 1194 to couple the first coil 1110 and the second coil 1120. In another embodiment, referring to fig. 3, the third coil 1210 and the fourth coil 1220 are coupled to the second coupling segment 1294. In addition, the second inductor unit 1200 further includes a second interleaving element 1230, and the second interleaving element 1230 spans the second coupling segment 1294 to couple the third coil 1210 and the fourth coil 1220. In some embodiments, referring to fig. 2 and fig. 3, the first coupling segment 1194, the second coupling segment 1294, and the first inductive unit 1100 are located on the same layer, for example, all located on a first metal layer. The first interleaving element 1130, the second interleaving element 1230 and the second inductor unit 1200 are located on the same layer, for example, all located on the second metal layer.

Referring to fig. 2 and 3, the first coil 1110 and the second coil 1120 are wound into at least two turns, and the third coil 1210 and the fourth coil 1220 are wound into at least one turn.

Referring to fig. 2, in an embodiment, the first coil 1110 of the first inductive unit 1100 includes a first coil 1112 and a second coil 1114. Structurally, the second ring 1114 is disposed around the first ring 1112, and the first ring 1112 and the second ring 1114 are coupled to a first side (e.g. upper side) of the stacked inductor apparatus 1000 of fig. 1 in a staggered manner. In addition, the second coil 1120 of the first inductance unit 1100 includes a third coil 1122 and a fourth coil 1124. Structurally, the fourth ring 1124 is disposed around the third ring 1122, and the third ring 1122 and the fourth ring 1124 are coupled to a second side (e.g., a lower side) of the stacked inductor 1000 of fig. 1 in a staggered manner.

In one embodiment, the first opening 1128 of the second coil 1120 is located on the opposite side (top side in the figure) of the staggered coupling 1126 of the third and

fourth turns

1122, 1124 of the second coil 1120.

Referring to fig. 1 to 3, the third coil 1210 is disposed above the second coil 1114 of the first coil 1110, and the fourth coil 1220 is disposed above the fourth coil 1124 of the second coil 1120.

In one embodiment, referring to fig. 3, the third coil 1210 includes a first winding 1214, and the first winding 1214 is located at an opposite side (e.g., upper side) of the second opening 1212 of the third coil 1210. In addition, referring to fig. 2 and fig. 3, the first winding element 1214 and the staggered coupling 1116 of the first ring 1112 and the second ring 1114 of the first coil 1110 are located on the same side (e.g. the upper side in the figure), and the first winding element 1214 is not overlapped with the staggered coupling 1116 of the first ring 1112 and the second ring 1114.

In another embodiment, referring to fig. 3, the fourth coil 1220 includes a second winding member 1224, and the second winding member 1224 is located at an opposite side (e.g., lower side) of the first opening 1128 of the second coil 1120 of fig. 2. In addition, referring to fig. 2 and fig. 3, the second winding element 1224 and the staggered coupling 1126 of the third and

fourth turns

1122, 1124 of the second coil 1120 are located on the same side (e.g., the lower side in the figure), and the second winding element 1224 does not overlap the staggered coupling 1126 of the third and

fourth turns

1122, 1124.

Referring to fig. 1 to 3, at 1190 where the first coil 1110 is adjacent to the

second coil

1120, or 1290 where the third coil 1210 is adjacent to the fourth coil 1220, the first coil 1112, the third coil 1210, the second coil 1114 of the first coil 1110, the fourth coil 1220, the fourth coil 1124 of the second coil 1120, and the third coil 1122 of the second coil 1120 are sequentially arranged.

Referring to fig. 1 to 3, when 1190 is adjacent to the first coil 1110 and the

second coil

1120 or 1290 is adjacent to the third coil 1210 and the fourth coil 1220, the first coil 1112, the third coil 1210, the second coil 1114 of the first coil 1110, the fourth coil 1220, the fourth coil 1124 of the second coil 1120, and the third coil 1122 of the second coil 1120 are not overlapped with each other.

Fig. 4 is a schematic diagram illustrating a partial structure of the stacked inductor 1000 shown in fig. 1 according to yet another embodiment of the present disclosure. Compared to fig. 2, fig. 4 illustrates the structure in the same metal layer in the same figure to facilitate understanding of the structure of the present invention. Fig. 5 is a schematic diagram illustrating a partial structure of the stacked inductor 1000 shown in fig. 1 according to another embodiment of the present disclosure. Compared to fig. 3, fig. 5 illustrates the structure in the same metal layer in the same figure to facilitate understanding of the structure of the present invention. The reference numerals in fig. 4 and 5 are the same as those in fig. 1 to 3, and are the same components, and the relationship between the components has been described in the above embodiments, and will not be described herein. It should be noted that, as shown in fig. 4 and fig. 5, in the stacked inductor 1000, the structures located in the same layer are quite symmetrical, and thus, the related electrical characteristics are better than those of the general inductor structure.

Fig. 6 is a schematic diagram illustrating a stacked inductor apparatus 1000A according to an embodiment of the present disclosure. Compared to the stacked inductor device 1000 shown in fig. 1, the first coil 1110A of the first inductor unit 1100A of the stacked inductor device 1000A of fig. 6 is alternatively coupled to the left side in the figure, and the first winding 1214A of the second inductor unit 1200A is correspondingly disposed on the left side in the figure. In addition, the second coil 1120A of the first inductance unit 1100A of the stacked inductance device 1000A of fig. 6 is cross-coupled to the right side in the figure, and the second winding 1224A of the second inductance unit 1200A is correspondingly disposed on the right side in the figure.

Fig. 7 is a graph illustrating experimental data of an inductive device according to an embodiment of the present disclosure. The experimental data plot illustrates the quality factor (Q) and inductance of the inductive device at different frequencies. As shown in the figure, a curve C1 is a quality factor curve of the first inductance unit 1100 of the stacked inductance device 1000 of the present disclosure, a curve C2 is a quality factor curve of the second inductance unit 1200 of the stacked inductance device 1000 of the present disclosure, a curve C3 is an inductance value curve of the first inductance unit 1100 of the present disclosure, and a curve C4 is an inductance value curve of the second inductance unit 1200 of the present disclosure. From the experimental data of fig. 6, it can be seen that the quality factor of the inductive device can reach about 11. Therefore, the stacked inductor device 1000 of the present disclosure has better electrical characteristics. However, the present disclosure is not limited to the above-mentioned values, and those skilled in the art can adjust the above-mentioned values according to actual requirements to achieve the best performance.

According to the embodiments of the present invention, the following advantages can be obtained. Embodiments of the present invention provide a stacked inductor device to achieve better electrical characteristics (e.g., higher quality factor of the inductor) and to improve the performance of the stacked inductor device.

Although specific embodiments of the present disclosure have been described above, it should be understood that they have the ordinary skill in the art and various changes and modifications can be made therein without departing from the spirit and scope of the present disclosure, and therefore the scope of the present disclosure should be determined by the appended claims.

Claims

1. A stacked inductor apparatus, comprising:

a first inductive element, comprising:

a first coil disposed on a first side of the first inductor unit; and

a second coil disposed on a second side of the first inductance unit opposite to the first side, comprising:

a first opening disposed at a first side of the stacked inductor device; and

a second inductive unit disposed on the first inductive unit, comprising:

a third coil disposed on a first side of the second inductor unit, wherein the first side of the second inductor unit corresponds to the first side of the first inductor unit, and the third coil comprises:

a second opening disposed on a second side of the stacked inductor device opposite to the first side;

a fourth coil disposed on a second side of the second inductance unit opposite to the first side, wherein the second side of the second inductance unit corresponds to the second side of the first inductance unit,

wherein the second coil of the first inductance unit comprises:

a third turn; and

and a fourth ring disposed around the third ring, wherein the third ring and the fourth ring are coupled to the second side of the stacked inductor device in a staggered manner, and a staggered coupling position of the third ring and the fourth ring is opposite to the first opening.

2. The stacked inductor apparatus of claim 1, wherein the first inductor unit is disposed on a first metal layer, and the second inductor unit is disposed on a second metal layer on the first metal layer.

3. The stacked inductor apparatus of claim 1, wherein the first coil and the second coil are adjacently cross-coupled, and the third coil and the fourth coil are adjacently cross-coupled.

4. The stacked inductor apparatus of claim 3, wherein the first coil and the second coil are cross-coupled adjacent to each other at a first cross-coupling point, and the third coil and the fourth coil are cross-coupled adjacent to each other at a second cross-coupling point, wherein the first cross-coupling point and the second cross-coupling point are not overlapped.

5. The stacked inductor apparatus of claim 1, wherein the first coil and the second coil are coupled to a first coupling section, wherein the first inductor unit further comprises a first cross-piece crossing the first coupling section to couple the first coil and the second coil.

6. The stacked inductor apparatus of claim 5, wherein the third coil and the fourth coil are coupled to a second coupling segment, and wherein the second inductor unit further comprises a second interleaving element crossing the second coupling segment to couple the third coil and the fourth coil.

7. The stacked inductor apparatus of claim 6, wherein the first coupling section, the second coupling section and the first inductor unit are located at the same layer, and wherein the first interleaving member, the second interleaving member and the second inductor unit are located at the same layer.

8. The stacked inductor apparatus of claim 1 wherein the first coil and the second coil are wound into at least two turns, and the third coil and the fourth coil are wound into at least one turn.

9. The stacked inductor apparatus of claim 8,

wherein the second coil of the first inductance unit comprises:

a third turn; and

and a fourth ring disposed around the third ring, wherein the third ring and the fourth ring are coupled to the second side of the stacked inductor device in a staggered manner.

10. The stacked inductor apparatus of claim 9, wherein the cross-coupling of the first coil and the second coil is opposite to the second opening.