Figure eight-shaped inductor

Patent metadata

Field	Value
Publication number	US-2025385036-A1
Application number	US-202519237874-A
Country	US
Kind code	A1
Filing date	Jun 13, 2025
Priority date	Jun 18, 2024
Publication date	Dec 18, 2025
Grant date	—

Abstract

A figure eight-shaped inductor includes, in a first conductive layer, an exterior loop of a first part of the inductor connected to a first exterior partial loop of a second part of the inductor and further connected to one or more interior loops of the first part, the exterior loop and the interior loops of the first part being concentric, and one or more interior loops of the second part connected to a second exterior partial loop of the second part, the exterior partial loops and the interior loops of the second part being concentric. The inductor further includes, in a second conductive layer, a conductive link connecting through a vie to the interior loops of the first part and connected through a via to the interior loops of the second part.

First claim

1 . A figure eight-shaped inductor, comprising:
a stack of insulating and conducting layers including a first conductive layer and a second conductive layer; wherein the first conductive layer comprises:
an exterior loop of a first part of the inductor having a first end connected to an end of a first exterior partial loop of a second part of the inductor and a second end connected to a first end of one or more interior loops of the first part of the inductor, the exterior loop and the one or more interior loops of the first part being concentric; and
one or more interior loops of the second part of the inductor having a first end connected to an end of a second exterior partial loop of the second part of the inductor, the first and second exterior partial loops and the one or more interior loops of the second part being concentric; and
wherein the second conductive layer comprises a conductive link connected through a via to a second end of the one or more interior loops of the first part of the inductor and connected through a via to a second end of the one or more interior loops of the second part of the inductor.

2 . The figure eight-shaped inductor according to claim 1 , wherein a current flow between a first terminal and a second terminal of the inductor is in a first direction of rotation in both the exterior loop and the one or more interior loops of the first part and is in a second direction of rotation opposite to the first direction in both the first and second exterior partial loops and the one or more interior loops of the second part.

3 . The figure eight-shaped inductor according to claim 1 , wherein, in the first part, a first width of the exterior loop is larger than a second width of the one or more interior loops and wherein, in the second part, a third width of the first and second exterior partial loops is larger than a fourth width of the one or more interior loops.

4 . The figure eight-shaped inductor according to claim 1 , wherein stack of insulating and conducting layers extends over a substrate and the second conductive layer is closer to the substrate than the first conductive layer.

5 . The figure eight-shaped inductor according to claim 1 , wherein stack of insulating and conducting layers extends over a substrate and the first conductive layer is closer to the substrate than the second conductive layer.

6 . An integrated circuit comprising the inductor according to claim 1 .

7 . A voltage-controlled oscillator comprising the inductor according to claim 1 .

8 . A transmitter comprising the inductor according to claim 1 .

9 . A method, comprising:
applying a current, by an electronic circuit, to the figure eight-shaped inductor of claim 1 , and transmitting the current through the inductor.

10 . The method according to claim 9 , wherein:
the current is applied to a first terminal of the figure eight-shaped inductor; the current is transmitted from the first terminal to a second terminal of the figure eight-shaped inductor; and the current is output at the second terminal of the figure eight-shaped inductor.

11 . A method of manufacturing a figure eight-shaped inductor, comprising:
in a stack of insulating and conducting layers:
forming, in a first conductive layer of the stack, an exterior loop of a first part of the inductor having a first end connected to an end of a first exterior partial loop of a second part of the inductor and a second end connected to a first end of one or more interior loops of the first part of the inductor, the exterior loop and the one or more interior loops of the first part being concentric;
forming, in the first conductive layer of the stack, one or more interior loops of the second part of the inductor having a first end connected to an end of a second exterior partial loop of the second part of the inductor, the first and second exterior partial loops and the one or more interior loops of the second part being concentric.

12 . The method of manufacturing the figure eight-shaped inductor according to claim 11 , further comprising, after forming the first conductive layer:
forming a first via contacting a second end of the one or more interior loops of the first part of the inductor; forming a second via, contacting a second end of the one or more interior loops of the second part of the inductor; and forming, in a second conductive layer of the stack, a conductive link connecting the first via and the second via.

13 . The method of manufacturing the figure eight-shaped inductor according to claim 11 , further comprising, before forming the first conductive layer:
forming, in a second conductive layer of the stack, a conductive link; forming a first via, contacting a first end of the conductive link and further contacting a second end of the one or more interior loops of the first part of the inductor; and forming a second via, contacting a second end of the conductive link and further contacting a second end of the one or more interior loops of the second part of the inductor.

Assignees

• St Microelectronics Int Nv

Inventors

• Barrera Cervantes Fernando
• Esch Helene
• Level Philippe
• Sordet Fabien

Classifications

• H01F2027/2809

  on stacked layers · CPC title

• H01F2017/0073

  with a special conductive pattern, e.g. flat spiral · CPC title

• H01F27/2804 Primary

  Printed windings · CPC title

• H01F17/0013 Primary

  with stacked layers · CPC title