Spiral inductor with multi-trace structure

• US 7,859,383 B2
• Filed: 10/20/2009
• Issued: 12/28/2010
• Est. Priority Date: 01/12/2007
• Status: Active Grant

• Current Assignee: VIA Technologies Incorporated (VIA Technologies)
• Original Assignee: VIA Technologies Incorporated (VIA Technologies)
• Inventors: Lee, Sheng-Yuan
• Primary Examiner(s): NGUYEN, TUYEN T
• Application Number:
  US12/581,949
• Publication Number:
  US 20100039205A1
• Time in Patent Office: 434 Days
• Field of Search: 336/65, 336/83, 336/200, 336/232, 257/531
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2017/0046 with a conductive path having a bridge
• CPC Class Codes: H01F 2017/0086 on semiconductor substrate inductors for integrated circuits H01L28/10

Abstract

A spiral inductor with a multi-trace structure having an insulating layer disposed on a substrate. A first spiral conductive trace with multiple turns is disposed on the insulating layer, wherein the outermost turn and the innermost turn of the first spiral conductive trace have a first end and a second end, respectively, and one of the first and second ends is connected to ground. A second spiral conductive trace with a single turn is disposed on the insulating layer and adjacent to the first spiral conductive trace, wherein the second spiral conductive trace is electrically connected to the turn that is connected to the ground and belongs to the first spiral conductive trace. The first spiral conductive trace has a relative outside and a relative inside, wherein the end of the first spiral conductive trace connected to ground and the second spiral conductive trace are located at different sides respectively.

Claims

1. A spiral inductor with a multi-trace structure, comprising:

an insulating layer disposed on a substrate;

a first spiral conductive trace with multiple turns disposed on the insulating layer, wherein the outermost turn of the first spiral conductive trace is connected to ground; and

at least one second spiral conductive trace with a single turn disposed on the insulating layer and located inside the innermost turn of the first spiral conductive trace, wherein the second spiral conductive trace is connected to the outermost turn of the first spiral conductive trace to form the multi-trace structure.

2. The spiral inductor as claimed in claim 1, wherein the first spiral conductive trace is parallel to the second spiral conductive trace.

3. The spiral inductor as claimed in claim 2, further comprising a connecting trace disposed in the insulating layer for electrically connecting an end of the outermost turn of the first spiral conductive trace to a corresponding end of the second spiral conductive trace.

4. The spiral inductor as claimed in claim 1, wherein the first and second spiral conductive traces have the same line width.

5. The spiral inductor as claimed in claim 1, wherein the first and second spiral conductive traces are circular, rectangular, hexagonal, octagonal or polygonal.

6. The spiral inductor as claimed in claim 1, wherein the second spiral conductive trace and the outermost turn of the first spiral conductive trace are electrically connected in parallel.