SPIRAL INDUCTOR

• US 20090115562A1
• Filed: 02/01/2008
• Published: 05/07/2009
• Est. Priority Date: 11/06/2007
• Status: Active Grant

• Current Assignee: VIA Technologies Incorporated (VIA Technologies)
• Original Assignee: VIA Technologies Incorporated (VIA Technologies)
• Inventors: Lee, Sheng-Yuan, Lin, Hsiao-Chu
• Granted Patent: US 8,081,056 B2
• Time in Patent Office: Days
• 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 2017/0086 on semiconductor substrate
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00
• CPC Class Codes: H01L 23/5227 Inductive arrangements or effects of, or between, wiring layers other inductive arrangements H01L23/645
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00

Abstract

A spiral inductor is provided. The spiral inductor includes a first spiral conductive trace with at least one turn, a second spiral conductive trace, and a connector. The first spiral conductive trace comprises an outer end and an inner end. The second spiral conductive trace surrounds a portion of the outermost turn of the first spiral conductive trace, and comprises a first end and a second end. The connector electrically connects to the inner end and the first end.

Claims

1. A spiral inductor, comprising:

a first spiral conductive trace with at least one turn, wherein the first spiral conductive trace comprises an outer end and an inner end;

a second spiral conductive trace, comprising a first end and a second end, surrounding a portion of the outermost turn of the first spiral conductive trace; and

a connector, electrically connecting the inner end and the first end.

2. The inductor as claimed in claim 1, wherein

the first spiral conductive trace, except for the inner end, comprises a substantially uniform width W₁;

and

the inner end comprises a width W₂ greater than W₁.

3. The inductor as claimed in claim 1, further comprising:

a first I/O port, electrically connected to the outer end and extending farther away from the first spiral conductive trace; and

a second I/O port, electrically connected to the second end and extending farther away from the second spiral conductive trace.

4. The inductor as claimed in claim 3, wherein the first I/O port is substantially parallel to the second I/O port.

5. The device as claimed in claim 4, wherein

the first spiral conductive trace, except for the inner end, comprises a substantially uniform width W₁;

the inner end, comprises a width W₂ greater than W₁;

pitches between neighboring turns of the first spiral conductive trace, are substantially uniform and of a value P; and

a pitch between the first I/O port and the second I/O port, substantially equals P.

6. The inductor as claimed in claim 1, wherein the second spiral conductive trace is substantially parallel to the outermost turn of the first spiral conductive trace.

7. The inductor as claimed in claim 1, wherein the second spiral conductive trace does not extend into a region surrounded by the first spiral conductive trace, and does not contact the first spiral conductive trace.

8. A spiral inductor, comprising:

an insulating layer, disposed overlying a substrate;

a first spiral conductive trace, with at least one turn, disposed in the insulating layer, wherein the first spiral conductive trace comprises an outer end and an inner end;

a second spiral conductive trace, comprising a first end and a second end, disposed in the insulating layer and surrounding a portion of the outermost turn of the first spiral conductive trace, and the first spiral conductive trace and the second spiral conductive trace belong to the same wiring layer;

a first conductor, electrically connected to the inner end and protruding from the first spiral conductive trace;

a second conductor, electrically connected to the first end and protruding from the second spiral conductive trace in a direction substantially the same as a protruding direction of the first conductor; and

a connection element, electrically connecting the first conductor and the second conductor, wherein the connection element and the first spiral conductive trace belong to different wiring layers.

9. The inductor as claimed in claim 8, wherein

the first conductor and the second conductor, are plugs disposed in the insulating layer;

and

the connection element, is disposed in a wiring layer underlying the first conductor and the second conductor.

10. The inductor as claimed in claim 8, wherein the first conductor and the second conductor are pad structures disposed overlying the insulating layer.

11. The inductor as claimed in claim 10, wherein the connection element is a bonding wire.

12. The inductor as claimed in claim 8, further comprising an electronic component electrically connecting the first conductor and the second conductor, wherein the electronic component comprises the connection element.

13. The inductor as claimed in claim 8, wherein

the first spiral conductive trace, except for the inner end, comprises a substantially uniform width W₁;

and

the inner end comprises a width W₂ greater than W₁.

14. The inductor as claimed in claim 8, further comprising:

a first I/O port, disposed in the insulating layer, and electrically connected to the outer end and extending farther away from the first spiral conductive trace; and

a second I/O port, disposed in the insulating layer, and electrically connected to the second end and extending farther away from the second spiral conductive trace.

15. The inductor as claimed in claim 14, wherein the first I/O port is substantially parallel to the second I/O port.

16. The device as claimed in claim 15, wherein

the first spiral conductive trace, except for the inner end, comprises a substantially uniform width W₁;

the inner end comprises a width W₂ greater than W₁;

pitches between neighboring turns of the first spiral conductive trace are substantially uniform and of a value P; and

a pitch between the first I/O port and the second I/O port substantially equals P.

17. The inductor as claimed in claim 15, wherein the first I/O port, the second I/O port, the first spiral conductive trace, and the second spiral conductive trace belong to the same wiring layer.

18. The inductor as claimed in claim 8, wherein the second spiral conductive trace is substantially parallel to the outermost turn of the first spiral conductive trace.

19. The inductor as claimed in claim 8, wherein the substrate is selected from a group consisting of a semiconductor substrate, a core substrate of a leadframe, and a core substrate of a printed circuit board.

20. The inductor as claimed in claim 8, wherein the second spiral conductive trace does not extend into a region surrounded by the first spiral conductive trace, and does not contact the first spiral conductive trace.