Integrated transformer with stack structure

• US 7,164,339 B2
• Filed: 02/24/2005
• Issued: 01/16/2007
• Est. Priority Date: 10/08/2004
• Status: Active Grant

• Current Assignee: Winbond Electronics Corporation
• Original Assignee: Winbond Electronics Corporation
• Inventors: Huang, Kai-Yi
• Primary Examiner(s): Mai, Anh
• Application Number:
  US10/906,540
• Publication Number:
  US 20060077028A1
• Time in Patent Office: 691 Days
• Field of Search: 336/200, 336/223, 336/232
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 2017/0046 with a conductive path having a bridge
• CPC Class Codes: H01F 2021/125 Printed variable inductor with taps, e.g. for VCO
• CPC Class Codes: H01F 27/2804 Printed windings

Abstract

An integrated transformer with a stack structure comprises a middle dielectric layer, a bottom dielectric layer, a first winding and a second winding. A portion of the first winding is disposed over a surface of the middle dielectric layer and the remaining portion of the first winding is disposed over a surface of the bottom dielectric layer. A portion of the second winding is disposed over the surface of the middle dielectric layer and the remaining portion of the second winding is disposed over the surface of the bottom dielectric layer. The second winding doesn'"'"'t intersect with the first winding. The portions of the first and second windings over the surface of the middle dielectric layer connect with the remaining portions of the first and second windings over the surface of the bottom dielectric through via plugs.

Claims

1. An integrated transformer with a stack structure, comprising:

a middle dielectric layer;

a bottom dielectric layer;

a first conductive line of a primary side disposed over a surface of the middle dielectric layer, laid as a first preset pattern, wherein a terminal of the first conductive line of the primary side is a first terminal of the primary side of the integrated transformer, and another terminal of the first conductive line of the primary side is a first plug terminal of the primary side;

a second conductive line of the primary side disposed over the surface of the middle dielectric layer, laid as the first preset pattern, wherein the second conductive line of the primary side is symmetric to the first conductive line of the primary side through a first axis, a terminal of the second conductive line of the primary side is a second terminal of the primary side of the integrated transformer, and another terminal of the second conductive line of the primary side is a second plug terminal of the primary side;

a third conductive line of the primary side disposed over a surface of the bottom dielectric layer, laid as a second preset pattern, wherein a terminal of the third conductive line of the primary side is a third plug terminal of the primary side;

a first via plug, connecting the first plug terminal of the primary side and the third plug terminal of the primary side;

a fourth conductive line of the primary side disposed over the surface of the bottom dielectric layer, laid as the second preset pattern, wherein the fourth conductive line of the primary side is symmetric to the third conductive line of the primary side through a second axis, a terminal of the fourth conductive line of the primary side and another terminal of the third conductive line of the primary side, which is in a opposite position to the third plug terminal of the primary side, are connected at the second axis, and another terminal of the fourth conductive line of the primary side is a fourth plug terminal of the primary side;

a second via plug, connecting the second plug terminal of the primary side and the fourth plug terminal of the primary side;

a first conductive line of a secondary side disposed over the surface of the middle dielectric layer, symmetric to first conductive line of the primary side through a third axis, wherein a terminal of the first conductive line of the secondary side is a first terminal of the secondary side of the integrated transformer, and another terminal of the first conductive line of the secondary side is a first plug terminal of the secondary side;

a second conductive line of the secondary side disposed over the surface of the middle dielectric layer, symmetric to the second conductive line of the primary side through the third axis and symmetric to the first conductive line of the secondary side through the first axis, wherein a terminal of the second conductive line of the secondary side is a second terminal of the secondary side of the integrated transformer, and another terminal of the second conductive line of the secondary side is a second plug terminal of the secondary side;

a third conductive line of the secondary side disposed over the surface of the bottom dielectric layer, symmetric to the third conductive line of the primary side through a fourth axis, wherein a terminal of the third conductive line of the secondary side is a third plug terminal of the secondary side;

a third via plug, connecting the first plug terminal of the secondary side and the third plug terminal of the secondary side;

a fourth conductive line of the secondary side disposed over the surface of the bottom dielectric layer, symmetric to the fourth conductive line of the primary side through the fourth axis and symmetric to the third conductive line of the secondary side through the second axis, wherein a terminal of the fourth conductive line of the secondary side and another terminal of the third conductive line of the secondary side, which opposite to the third plug terminal of the secondary side, are connected at the second axis, and another terminal of the fourth conductive line of the secondary side is a fourth plug terminal of the secondary side; and

a fourth via plug, connecting the second plug terminal of the secondary side and the fourth plug terminal of the secondary side.

2. The integrated transformer with a stack structure of claim 1, wherein the first conductive line of the primary side, the second conductive line of the primary side, the third conductive line of the primary side and the fourth conductive line of the primary side do not intersect with the first conductive line of the secondary side, the second conductive line of the secondary side, the third conductive line of the secondary side and the fourth conductive line of the secondary side.

3. The integrated transformer with a stack structure of claim 1, wherein the first axis is orthogonal to the third axis.

4. The integrated transformer with a stack structure of claim 1, wherein the second axis is orthogonal to the fourth axis.

5. The integrated transformer with a stack structure of claim 1, wherein the second axis is a vertical projection of the first axis on the surface of the bottom dielectric layer.

6. The integrated transformer with a stack structure of claim 1, wherein the fourth axis is a vertical projection of the third axis on the surface of the bottom dielectric layer.

7. The integrated transformer with a stack structure of claim 1, wherein a location at which the third conductive line of the primary side and the fourth conductive line of the primary side are connected is a center tap of the integrated transformer.

8. The integrated transformer with a stack structure of claim 1, wherein a location at which the third conductive line of the secondary side and the fourth conductive line of the secondary side are connected is a center tap of the integrated transformer.

9. An integrated transformer with a stack structure, comprising:

a middle dielectric layer;

a bottom dielectric layer;

a first winding, wherein a portion of the first winding is disposed over a surface of the middle dielectric layer, the remaining portion of the first winding is disposed over a surface of the bottom dielectric layer, and two terminals of the first winding are two terminals of the primary side of the integrated transformer; and

a second winding, wherein a portion of the second winding is disposed over the surface of the middle dielectric layer, the remaining portion of the first winding winds is disposed over the surface of the bottom dielectric layer, the second winding does not intersect with the first winding, and two terminals of the second winding are two terminals of the secondary side of the integrated transformer.

10. The integrated transformer with a stack structure of claim 9, wherein the portion of the first winding over the surface of the middle dielectric layer connects with the remaining portion of the first winding disposed over the surface of the bottom dielectric layer through a via plug.

11. The integrated transformer with a stack structure of claim 9, wherein the portion of the second winding over the surface of the middle dielectric layer is connected with the remaining portion of the second winding disposed over the surface of the bottom dielectric layer through a via plug.

12. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by a portion of the first winding over the surface of the middle dielectric layer is symmetric through a first axis.

13. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by a portion of the second winding over the surface of the middle dielectric layer is symmetric through a first axis.

14. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by the remaining portion of the first winding over the surface of the bottom dielectric layer is symmetric through a second axis.

15. The integrated transformer with a stack structure of claim 14, wherein a location at which the remaining portion of the first winding over the surface of the bottom dielectric layer connects with the second axis is a center tap of the integrated transformer.

16. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by the remaining portion of the second winding over the surface of the bottom dielectric layer is symmetric through a second axis.

17. The integrated transformer with a stack structure of claim 16, wherein a location at which the remaining portion of the second winding over the surface of the bottom dielectric layer connects with the second axis is a center tap of the integrated transformer.

18. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by a portion of the first winding over the surface of the middle dielectric layer is symmetric to a pattern formed by a portion of the second winding over the surface of the middle dielectric layer through a third axis.

19. The integrated transformer with a stack structure of claim 9, wherein a pattern formed by the remaining portion of the first winding over the surface of the bottom dielectric layer is symmetric to a pattern formed by the remaining portion of the second winding over the surface of the bottom dielectric layer through a fourth axis.