Transformer arrangement

Abstract

The transformer device includes a first coil, a second coil, and a third coil. The first coil includes a plurality of first segments and a first connection portion. The first segments are connected to each other via the first connection portion. The second coil includes a plurality of second segments and a plurality of second connection portions. The second segments are connected to each other via the second connection portions. The third coil includes a plurality of third segments and a plurality of third connection portions. The third segments form a ring structure via the third connection portions to couple the first coil and the second coil. A first portion of the first segments and a second portion of the second segments are located within a range of the ring structure. The first portion of the first segments is located within a range of the second coil, and the second portion of the first segments is located within a range of the first coil.

Description

Technical Field

[0001] This disclosure relates to transformer devices, and more particularly to planar transformer devices that can be used for power combining. Background Technology

[0002] Some integrated circuits used for radio frequency signals need to convert signals between common mode and differential mode. This conversion can be achieved using a balun. A balun is an application of a transformer, and in integrated circuits, it is also composed of coils. Therefore, how to arrange the coils to achieve good coupling, a high quality factor, and good line balance is an important issue. Summary of the Invention

[0003] In some embodiments, the transformer assembly includes a first coil, a second coil, and a third coil. The first coil includes a plurality of first segments and a first connection portion. The first segments are interconnected via the first connection portion. The second coil includes a plurality of second segments and a plurality of second connection portions. The second segments are interconnected via the second connection portions. The third coil includes a plurality of third segments and a plurality of third connection portions. The third segments form a ring structure via the third connection portions to couple the first coil and the second coil. A first portion of the first segment and a second portion of the second segment are located within a region of the ring structure, the first portion of the first segment is located within a region of the second coil, and the second portion of the first segment is located within a region of the first coil.

[0004] The features, implementation, and technical effects of this disclosure are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0005] Figure 1A This is a schematic diagram illustrating a transformer device according to some embodiments of the present disclosure;

[0006] Figure 1B Drawings based on some embodiments of this disclosure Figure 1A A schematic diagram of the two coils in the diagram;

[0007] Figure 1C Drawings based on some embodiments of this disclosure Figure 1A A schematic diagram of the coil in the diagram;

[0008] Figure 2A This is a schematic diagram of a transformer device according to some embodiments of the present disclosure;

[0009] Figure 2B Drawings based on some embodiments of this disclosure Figure 2A A schematic diagram of some line segments in the diagram;

[0010] Figure 2C Drawings based on some embodiments of this disclosure Figure 2A A schematic diagram of some line segments in the diagram;

[0011] Figure 2D Along according to some embodiments of this disclosure Figure 2A or Figure 2B A side view of multiple coils in the diagram; and

[0012] Figure 3 As illustrated in some embodiments according to this disclosure Figure 2A The experimental results of the transformer device are shown in the figure.

[0013] Symbol Explanation

[0014] 100, 200: Transformer unit

[0015] 120, 140, 160: Coils

[0016] A-A', B-B', S-S': Reference lines

[0017] C1~C6: Capacitors

[0018] CP1, CP2, CP3, CP4, CP5: Connecting parts

[0019] d1~d4: Line width

[0020] L1, L2, L3, L4, L5, L6: line segments

[0021] L11, L61: Part 1

[0022] L21, L62: Part Two

[0023] M1, M2, Q1, Q2: Curves

[0024] P1-1, P1-2, P1-3, P2-1, P2-2, P2-3, P3-1, P3-2: Endpoints

[0025] RDL: Rewire Layer

[0026] UTM: Ultra-thick metal layer

[0027] +Y, -Y: direction Detailed Implementation

[0028] All terms used herein have their ordinary meanings. The definitions of the terms above in commonly used dictionaries, and the examples of any term used in this disclosure, are merely illustrative and should not be construed as limiting the scope or meaning of this disclosure. Similarly, this disclosure is not limited to the various embodiments shown in this specification.

[0029] The terms "about" or "substantial" as used in this article generally refer to an error or range of approximately 20 percent, preferably approximately 10 percent, and even more preferably approximately 5 percent. Unless otherwise specified, all numerical values ​​mentioned herein are considered approximate, i.e., the error or range indicated by "about" or "substantial".

[0030] Additionally, for ease of explanation, spatially relative terms such as “left,” “right,” “up,” and “down” may be used herein to describe the relationship between one element (or feature) and another shown in the figures. These spatially relative terms are intended to cover different orientations of the device during use or operation, in addition to those shown in the figures. The device may have other orientations (e.g., rotated 90 degrees or in other orientations), and the spatially relative descriptive terms used herein shall be interpreted accordingly.

[0031] As used herein, “coupled” or “connected” can refer to two or more components making direct physical or electrical contact with each other, or indirectly making direct physical or electrical contact with each other, or to two or more components operating or acting on each other. As used herein, “circuit” can refer to a device consisting of at least one transistor and / or at least one active or passive component connected in a certain manner to process signals.

[0032] As used herein, the term "and / or" includes any combination of one or more of the listed related items. The terms first, second, third, etc., are used herein to describe and identify individual elements. Therefore, a first element herein may also be referred to as a second element without departing from the intent of this disclosure. For ease of understanding, similar elements in the figures will be designated with the same reference numerals.

[0033] Reference Figures 1A to 1C , Figure 1A This is a schematic diagram of a transformer device 100 according to some embodiments of the present disclosure. Figure 1B Drawings based on some embodiments of this disclosure Figure 1A A schematic diagram of coils 120 and 140 in the diagram, and Figure 1C Drawings based on some embodiments of this disclosure Figure 1AA schematic diagram of coil 160 is shown. In some embodiments, transformer device 100 may operate as (but is not limited to) a power combiner that couples signals from two symmetrical coils to a single coil to output a single signal. For ease of illustration, the various components included in transformer device 100 are shown respectively. Figure 1B and Figure 1C In some embodiments, the transformer assembly 100 may be composed of... Figure 1B Multiple coils 120 and 140, Figure 1C The coil 160 is formed in the middle.

[0034] Each of coils 120 and 140 can be a planar inductor. For example... Figure 1B As shown, coil 120 includes multiple line segments L1 (represented by diagonal stripes) and connecting portions CP1 (represented by dots). The multiple line segments L1 are interconnected via connecting portions CP1 to form coil 120. For example, each end of connecting portion CP1 has at least one guide hole (VIA) (represented by black) to couple connecting portion CP1 to the corresponding line segment L1. Similarly, coil 140 includes multiple line segments L2 (represented by white) and multiple connecting portions CP2 (represented by dots). The multiple line segments L2 are interconnected via connecting portions CP2 to form coil 140. For example, each end of connecting portion CP2 has at least one guide hole to couple connecting portion CP2 to the corresponding line segment L2.

[0035] In some embodiments, each of coils 120 and 140 may operate as a differential inductor. For example, coil 120 includes endpoints P1-1, P1-2, and P1-3. Endpoints P1-1 and P1-2 may output (or receive) a set of differential signals. In some embodiments, endpoint P1-3 is an intermediate endpoint between endpoints P1-1 and P1-2. In other words, the trace length between endpoints P1-1 and P1-3 is substantially the same as the trace length between endpoints P1-2 and P1-3. In some embodiments, endpoint P1-3 may be used to receive a common-mode voltage (e.g., AC ground). In some embodiments, endpoint P1-3 may operate as a center tap endpoint.

[0036] Similarly, coil 140 includes endpoints P2-1, P2-2, and P2-3. Endpoints P2-1 and P2-2 can output (or receive) a set of differential signals. In some embodiments, endpoint P2-3 is an intermediate endpoint between endpoints P2-1 and P2-2. In other words, the trace length between endpoints P2-1 and P2-3 is substantially the same as the trace length between endpoints P2-2 and P2-3. In some embodiments, endpoint P2-3 can be used to receive a common-mode voltage (e.g., AC ground). In some embodiments, endpoint P2-3 can operate as a center tap point.

[0037] In some embodiments, endpoint P2-3 is located at an intermediate position between endpoint P1-1 and endpoint P1-2. For example, a reference line A-A' exists at the intermediate position between endpoint P1-1 and endpoint P1-2, and endpoint P2-3 lies on reference line A-A'. Similarly, endpoint P1-3 is located at an intermediate position between endpoint P2-1 and endpoint P2-2. For example, a reference line B-B' exists at the intermediate position between endpoint P2-1 and endpoint P2-2, and endpoint P3-1 lies on reference line B-B'. In some embodiments, a reference line S-S' exists between coil 120 and coil 140, such that coil 120 and coil 140 are substantially mirror-symmetrical with respect to reference line S-S'. It should be understood that reference line S-S' is substantially located at an intermediate position between coil 120 and coil 140, and reference lines A-A', B-B', and S-S' are not physical elements in the transformer device 100.

[0038] Coil 160 can be a planar inductor, which can be used to couple coils 120 and 140. For example... Figure 1C As shown, coil 160 includes multiple line segments L3 (represented by horizontal stripes) and multiple connecting portions CP3 (represented by dots). The multiple line segments L3 are interconnected via multiple connecting portions CP3 to form a ring structure with two turns. For example, each end of a portion of the connecting portion CP3 has at least one via to couple the connecting portion CP3 to the corresponding line segment L3. Coil 160 can be configured for (but is not limited to) single-ended signaling applications. For example, coil 160 includes endpoint P3-1 and endpoint P3-2. Endpoint P3-1 can receive a single-ended signal, and endpoint P3-2 can receive a DC voltage (e.g., common-mode voltage or ground voltage), wherein endpoint P3-2 can be formed by a connecting portion CP3. In some embodiments, the ring structure of coil 160 is substantially mirror-symmetrical with respect to reference line S-S'. In other words, as... Figure 1A As shown, the transformer device 100 has a substantially bilaterally symmetrical structure.

[0039] like Figure 1B as well as Figure 1C As shown, in some embodiments, multiple line segments L1, multiple line segments L2, and multiple line segments L3 may be implemented by a first metal layer, and connection portion CP1, multiple connection portions CP2, and multiple connection portions CP3 may be implemented by a second metal layer, and the first metal layer is different from the second metal layer. For example, the first metal layer may be (but is not limited to) an ultrathick metal (UTM) layer, and the second metal layer may be (but is not limited to) a redistribution layer (RDL).

[0040] Refer to together Figures 1A to 1C The first part L11 of multiple line segments L1 and the second part L21 of multiple line segments L2 are located in Figure 1C Within a range of the annular structure shown. For example, the first part L11 and the second part L21 are disposed in... Figure 1C Between the innermost and outermost rings of the ring structure in coil 160. The first portion L11 is located within a region of coil 140, and the second portion L21 is located within a region of coil 160. With this arrangement, the ring structure of coil 160 can couple coil 120 and coil 140. In this way, the signal received by coil 160 can be simultaneously coupled to coil 140 and coil 120 to output two sets of differential signals. Alternatively, the differential signals received by coil 140 and coil 120 can be coupled to coil 160 to synthesize a single signal.

[0041] In some embodiments, endpoints P1-1, P1-2, P2-1, and P2-2 are all disposed at... Figure 1C Outside the outermost ring of the annular structure. Specifically, endpoints P1-1, P1-2, P2-1, and P2-2 are located on a first side of the annular structure, and endpoints P3-1 and P3-2 are located on a second side of the annular structure (relative to the first side). For example, the first side may be the side with the +Y direction, and the second side may be the side with the -Y direction. The above-described arrangement of the endpoints is for illustrative purposes only and is not intended to limit this disclosure.

[0042] Multiple line segments L1 can be connected from endpoint P1-1 to endpoint P1-2 in a clockwise direction via connecting part CP1, crossing the outermost ring of the ring structure three times. For example, starting from endpoint P1-1, multiple line segments L1 and connecting part CP1 can sequentially cross the rightmost outer ring of the ring structure, endpoint P3-2, and the leftmost outer ring of the ring structure to connect to endpoint P1-2. Figure 1AAs shown, in coil 120, from endpoint P1-1 to endpoint P1-2, multiple line segments L1 and connecting portion CP1 sequentially form an outer coil of approximately 1 / 4 turn, an inner coil of approximately 1 / 4 turn, an outer coil of approximately 1 / 4 turn, and an inner coil of approximately 1 / 4 turn. The inner coil is arranged diagonally, and the outer coil is also arranged diagonally.

[0043] Similarly, multiple line segments L2 can be connected from endpoint P2-1 to endpoint P2-2 in a counter-clockwise direction via multiple connecting parts CP2, crossing the outermost ring of the ring structure three times. For example, starting from endpoint P2-1, multiple line segments L2 and multiple connecting parts CP2 can sequentially cross the leftmost outer ring of the ring structure, endpoint P3-1, and the rightmost outer ring of the ring structure to connect to endpoint P2-2. Figure 1A As shown, in coil 140, from endpoint P2-1 to endpoint P2-2, multiple line segments L2 and multiple connecting portions CP2 sequentially form an outer coil of approximately 1 / 4 turn, an inner coil of approximately 1 / 4 turn, an outer coil of approximately 1 / 4 turn, and an inner coil of approximately 1 / 4 turn. The inner coil is arranged diagonally, and the outer coil is also arranged diagonally.

[0044] With the above configuration, the first portion L11 of multiple line segments L1 and the second portion L21 of multiple line segments L2 can be positioned between the outermost and innermost coils of the annular structure. The first portion L11 of multiple line segments L1 can be located within a range of coil 140. For example, the first portion L11 (e.g., the inner coils of two quarter turns in coil 120) is located within the outer coil of coil 140. The second portion L21 of multiple line segments L2 can be located within a range of coil 120. For example, the second portion L21 (e.g., the inner coils of two quarter turns in coil 140) is located within the outer coil of coil 120. In this way, the wire length of coil 120 can be substantially the same as the wire length of coil 140, so as to output two more matched differential signals.

[0045] In some embodiments, such as Figure 1B and Figure 1C As shown, each of coils 120 and 140 has one winding (i.e., a combination of the two inner quarter-turns and the two outer quarter-turns mentioned above), and coil 160 has two windings. Therefore, the ratio of the number of turns in one winding among coils 160, 120, and 140 is 2:1:1. It should be understood that the accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this disclosure. The number of turns in the windings of each of coils 120, 140, and 160 may be adjusted according to actual needs.

[0046] Reference Figures 2A to 2C . Figure 2A This is a schematic diagram of a transformer device 200 according to some embodiments of the present disclosure. Figure 2BDrawings based on some embodiments of this disclosure Figure 2A A schematic diagram of some line segments in the diagram, and Figure 2C Drawings based on some embodiments of this disclosure Figure 2A A schematic diagram of some line segments. Compared to Figure 1A The transformer assembly 200 also includes multiple line segments L4, connection parts CP4, multiple line segments L5, multiple connection parts CP5, and multiple line segments L6. For ease of explanation, the various components included in the transformer assembly 200 are shown respectively. Figure 2B and Figure 2C In some embodiments, the transformer assembly 200 may be composed of... Figure 2B Coil 120, coil 140, coil 160, multiple line segments L4, connecting part CP4, multiple line segments L5, multiple capacitors C1 to C2, and multiple connecting parts CP5. Figure 2C Multiple line segments L6 are formed in the middle.

[0047] like Figure 2B As shown, multiple line segments L4 (represented by diagonal stripes) and connecting portions CP4 (represented by dots) are substantially disposed next to multiple line segments L1 and connecting portions CP1. For example, multiple line segments L4 are disposed adjacent to multiple line segments L1 and outside coil 120. Connecting portions CP4 are disposed adjacent to connecting portions CP and are used to connect multiple line segments L4. For example, at least one guide hole is provided at both ends of connecting portions CP4 to connect multiple line segments L4. In some embodiments, the line width d1 of each of the multiple line segments L1 is greater than the line width d2 of each of the multiple line segments L4, but this disclosure is not limited thereto. In different embodiments, the line width d1 may be greater than, equal to or less than the line width d2. In some embodiments, multiple line segments L4 may be configured to receive one of a first preset voltage (e.g., system high voltage) and a second preset voltage (e.g., system low voltage or ground voltage), and multiple line segments L1 may be configured to receive the other of the first preset voltage and the second preset voltage.

[0048] Similarly, multiple line segments L5 and multiple connecting portions CP5 are substantially disposed adjacent to multiple line segments L2 and multiple connecting portions CP2. For example, multiple line segments L5 are disposed adjacent to multiple line segments L2 and outside the coil 140. Multiple connecting portions CP5 are respectively disposed adjacent to multiple connecting portions CP2 and are used to connect multiple line segments L5. For example, at least one guide hole is provided at both ends of multiple connecting portions CP5 to connect multiple line segments L5. In some embodiments, the line width d3 of each of the multiple line segments L2 is greater than the line width d4 of each of the multiple line segments L5, but this disclosure is not limited thereto. In different embodiments, the line width d3 may be greater than, equal to or less than the line width d4. In some embodiments, multiple line segments L5 may be configured to receive one of the aforementioned first preset voltage and the aforementioned second preset voltage, and multiple line segments L2 may be configured to receive the other of the first preset voltage and the second preset voltage. In some embodiments, multiple line segments L4 and multiple line segments L5 may be implemented by the aforementioned UTM layer, and connection portion CP4 and multiple connection portions CP5 may be implemented by the aforementioned RDL.

[0049] like Figure 2C As shown, multiple line segments L6 (represented by dots) comprise a first portion L61 and a second portion L62. The first portion L61 is coupled to multiple line segments L4. For example, as... Figure 2B As shown, each line segment L4 has several guide holes (or at least one guide hole) to couple line segment L4 to the corresponding line segment in the first part L61. The second part L62 is coupled to multiple line segments L5. For example, as Figure 2B As shown, each line segment L5 is provided with several guide holes (or at least one guide hole), which are used to couple line segment L5 to the corresponding line segment in the second part L62. Figure 2A As shown, in combination Figure 2B as well as Figure 2C After the structure in the middle, the first part L61 partially covers multiple line segments L4, multiple line segments L1 and multiple line segments L3, and the second part L62 partially covers multiple line segments L5, multiple line segments L2 and multiple line segments L3.

[0050] like Figure 2B As shown, in some embodiments, the transformer assembly 200 further includes a plurality of capacitors C1 and a plurality of capacitors C2. For ease of explanation, Figure 2A and Figure 2B The diagram only shows the placement of a few capacitors C1 and a few capacitors C2, and this disclosure does not imply... Figure 2A or Figure 2BThe number of capacitors shown is limited. Multiple capacitors C1 are positioned along and below multiple line segments L1 and L4 to couple the multiple line segments L1 and L4. Multiple capacitors C2 are positioned along and below multiple line segments L2 and L5 to couple the multiple line segments L2 and L5.

[0051] For ease of understanding, refer to Figure 2D , Figure 2D Drawings based on some embodiments of this disclosure Figure 2A or Figure 2B A side view of coils 120 and 140 is shown. For ease of understanding, Figure 2D The diagram illustrates the arrangement of a capacitor C1 and a capacitor C2, multiple line segments L1 to L6, and multiple connecting portions CP1 to CP2. Capacitors C1 and C2 are located on a first side (e.g., below) of the multiple line segments L1 to L5, and the multiple line segments L6 are located on a second side (e.g., above) of the multiple line segments L1 to L5. Capacitor C1 is located below line segments L1 and L4 to couple them. Similarly, capacitor C2 is located below line segments L2 and L5 to couple them. In some embodiments, capacitors C1 and C2 may be (but are not limited to) metal-insulator-metal (MIM) capacitors, metal-oxide-metal (MOM) capacitors, or capacitors implemented using transistors. Because capacitor C1 presents low impedance to AC signals, when line segment L1 (or line segment L4) receives an AC signal, this AC signal can be transmitted to line segment L4 (or line segment L1) via the signal path formed by capacitor C1. Similarly, because capacitor C2 presents low impedance to AC signals, when line segment L2 (or line segment L5) receives an AC signal, this AC signal can be transmitted to line segment L5 (or line segment L2) via the signal path formed by capacitor C2. In other words, by setting multiple capacitors C1 and C2, the AC coupling capability of coils 120 and 140 can be improved. Therefore, depending on the actual circuit application, the AC signal transmission capability of coils 120 and 140 can be increased, or the noise cancellation capability of coils 120 and 140 can be increased.

[0052] The first portion L61 covers segments L4, L1, and L3. Through this arrangement, a capacitor C3 is formed between the first portion L61 and segment L1 to couple coil 120. A capacitor C4 is formed between the first portion L61 and segment L3 to improve the coupling between coil 120 and coil 160. Similarly, the second portion L62 covers segments L5, L2, and L3. Thus, a capacitor C5 is formed between the second portion L62 and segment L2 to couple coil 140. A capacitor C6 is formed between the second portion L62 and segment L3 to improve the coupling between coil 140 and coil 160. This further enhances the AC signal transmission capability of coils 120 and 140, or increases their noise cancellation capability. In other embodiments, more guide holes (not shown) may be provided on multiple line segments L1 (and / or multiple line segments L2) to couple the corresponding line segment L1 (and / or the corresponding line segment L2) to the corresponding line segment L6.

[0053] Figure 3 As illustrated in some embodiments according to this disclosure Figure 2A The experimental results of transformer device 200 are shown in the figure. Curve Q1 corresponds to the quality factor of coil 160, curve Q2 corresponds to the quality factor of coil 120 (or coil 140), curve M1 corresponds to the inductance value of coil 160, and curve M2 corresponds to the inductance value of coil 120 (or coil 140). When applied to 2.5 gigahertz (GHz), the inductance value of coil 160 is approximately 2.5857 nanohenries (nH) with a quality factor of approximately 12.4831. The inductance value of coil 120 (or coil 140) is approximately 0.8199 nanohenries (nH) with a quality factor of approximately 9.3953. In other words, in Figure 2A In the example, the ratio between the inductance of coil 160 and the inductance of coil 120 (or coil 140) is approximately 3:1. These values ​​are for illustrative purposes only, and this disclosure is not limited to these values.

[0054] The above-described embodiments of various transformer devices (e.g., number of winding turns, materials, number of connection terminals, shape, etc.) and various application examples are for illustrative purposes only, and this disclosure is not limited to the above examples. For example, the shapes of coils 120, 140, and 160 can be other polygons or circles. The number of winding turns of coils 120, 140, and 160, or the spacing between the various line segments, can be adjusted according to actual needs.

[0055] In summary, the transformer device in some embodiments of this disclosure utilizes a mirror-symmetrical inductance structure with three sets of coils. This allows the transformer device to achieve better line balance, making it suitable for applications such as power combining, balanced-to-unbalanced conversion, and unbalanced-to-balanced conversion. Furthermore, depending on the application, the transformer device may also utilize multiple capacitors to enhance AC signal coupling or noise cancellation capabilities.

[0056] Although the embodiments of this disclosure are described above, they are not intended to limit this disclosure. Those skilled in the art can make changes to the technical features of this disclosure based on its express or implied content. All such changes may fall within the scope of patent protection sought by this disclosure. In other words, the scope of patent protection of this disclosure shall be determined by the claims of this specification.

Claims

1. A transformer device, comprising: A first coil includes a plurality of first segments and a first connecting portion, wherein the plurality of first segments are interconnected via the first connecting portion, and the first coil includes two endpoints for outputting or receiving a set of differential signals and a first intermediate endpoint, wherein a first reference line is present at the intermediate position between the two endpoints; A second coil includes a plurality of second segments and a plurality of second connecting portions, wherein the plurality of second segments are interconnected via the plurality of second connecting portions. The second coil includes two endpoints for outputting or receiving a set of differential signals and a second intermediate endpoint. A second reference line is located at the midpoint between the two endpoints. The second intermediate endpoint is located on the first reference line, and the first intermediate endpoint is located on the second reference line; as well as A third coil includes multiple third segments and multiple third connecting portions, wherein the multiple third segments form a ring structure via the multiple third connecting portions to couple the first coil and the second coil. A first portion of the plurality of first line segments and a second portion of the plurality of second line segments are located within a range of the annular structure, the first portion of the plurality of first line segments is located within a range of the second coil, and the second portion of the plurality of second line segments is located within a range of the first coil.

2. The transformer device as claimed in claim 1, wherein the plurality of first segments, the plurality of second segments, and the plurality of third segments are implemented by a first metal layer, the first connection portion, the plurality of second connection portions, and the plurality of third connection portions are implemented by a second metal layer, and the first metal layer is different from the second metal layer.

3. The transformer device as claimed in claim 1, wherein the first portion of the plurality of first segments and the second portion of the plurality of second segments are disposed between an innermost ring and an outermost ring of the annular structure.

4. The transformer device of claim 1, wherein the first coil includes a first end point and a second end point, the first end point and the second end point are disposed outside the outermost ring of the annular structure, and the plurality of first line segments are connected from the first end point to the second end point in a clockwise direction via the first connecting portion, and cross the outermost ring three times.

5. The transformer device of claim 4, wherein the second coil includes an intermediate endpoint, and the intermediate endpoint is located at an intermediate position between the first endpoint and the second endpoint.

6. The transformer device of claim 1, wherein the second coil includes a first end point and a second end point, the first end point and the second end point are disposed outside the outermost ring of the annular structure, and the plurality of second segments are connected from the first end point to the second end point in a counterclockwise direction via the second connecting portion, and cross the outermost ring three times.

7. The transformer device as claimed in claim 1, further comprising: Multiple fourth segments are disposed adjacent to the multiple first segments and outside the first coil; A plurality of first capacitors are disposed on a first side of the plurality of first line segments and the plurality of second line segments, and are used to couple the plurality of first line segments and the plurality of fourth line segments; A fourth connecting portion is disposed adjacent to the first connecting portion and is used to connect the plurality of fourth line segments; Multiple fifth segments are disposed adjacent to the multiple second segments and outside the second coil; A plurality of second capacitors are disposed on a second side of the plurality of first line segments and the plurality of second line segments, and are used to couple the plurality of second line segments and the plurality of fifth line segments; Multiple fifth connecting parts are used to connect the multiple fifth line segments; as well as Multiple sixth line segments are disposed on the first side of the multiple first line segments and the multiple second line segments. A first portion of the plurality of sixth line segments is coupled to the plurality of fourth line segments and partially covers the plurality of first line segments, and a second portion of the plurality of sixth line segments is coupled to the plurality of fifth line segments and partially covers the plurality of second line segments.

8. The transformer device of claim 7, wherein the first portion of the plurality of sixth segments and the plurality of first segments are used to form a third capacitor to couple the first coil.

9. The transformer device of claim 7, wherein the second portion of the plurality of sixth segments and the plurality of second segments are used to form a fourth capacitor to couple the second coil.

10. The transformer device of claim 7, wherein the first side and the second side are opposite sides of the plurality of first segments and the plurality of second segments.

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