SYMMETRIC MULTI-PORT INDUCTOR FOR DIFFERENTIAL MULTI-BAND RF CIRCUITS

• US 20160217904A1
• Filed: 01/22/2015
• Published: 07/28/2016
• Est. Priority Date: 01/22/2015
• Status: Active Grant

• Current Assignee: Globalfoundries US Incorporated (GlobalFoundries, Inc.)
• Original Assignee: International Business Machines Corporation
• Inventors: VANUKURU, Venkata N. R.
• Granted Patent: US 9,653,204 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 2017/0073 with a special conductive pattern, e.g. flat spiral
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances

Abstract

Structures and methods for implementing high performance symmetric multi-port inductors are provided. The multiport inductor structure includes a plurality of conductors which are structured and arranged in turns to obtain symmetry between a plurality of selected input terminals connecting to respective ones of the plurality of conductors.

Claims

1. A multiport inductor structure comprising a plurality of conductors which are structured and arranged in turns to obtain symmetry between a plurality of selected input terminals connecting to respective ones of the plurality of conductors.

2. The multiport inductor structure of claim 1, wherein the plurality of conductors comprises:

a first section of serially stacked turns of metal wiring segments;

a second section of parallel stacked turns of metal wiring segments; and

a third section of non-stacked metal wiring segments.

3. The multiport inductor structure of claim 2, wherein the first section of the serially stacked turns, the second section of the parallel stacked turns and the third section of the non-stacked metal wiring segments are provided in a spiral configuration.

4. The multiport inductor structure of claim 2, wherein;

each of the first section, the second section and the third section include metal wiring segments have varying width and spacing therebetween; and

a width of each metal wiring segment of the first section, the second section and the third section reduces as it goes toward a center and spacing between adjacent metal wiring segments increases as its goes toward the center.

5. The multiport inductor structure of claim 1, wherein a width or the diameter of each of the plurality of conductors is reduced at a constant rate or monotonic rate at is turns towards a center.

6. The multiport inductor structure of claim 1, wherein a spacing between each consecutive turn of the plurality of conductors increases at a constant rate or monotonic rate.

7. The multiport inductor structure of claim 6, wherein the spacing between each consecutive turn increases periodically.

8. The multiport inductor structure of claim 4, wherein at least one of the width and spacing of an upper turn is different from a lower turn for the metal wiring segments of the first section and the second section.

9. The multiport inductor structure of claim 4, wherein top metal wiring structures of the first section are offset vertically from bottom metal wiring structures of the first section.

10. The multiport inductor structure of claim 2, wherein the second section includes top wiring structures and bottom wiring structures of the plurality of conductors connected in parallel through a plurality of via interconnects along their length.

11. The multiport inductor structure of claim 2, wherein the first section provides a low frequency band, the second section provides an intermediate frequency band and the third section provides a high frequency band.

12. The multiport inductor structure of claim 1, wherein the symmetric inductor structure is a 3-dimensional structure.

13. The multiport inductor structure of claim 1, wherein a patterned ground shield is provided under spiral turns that correspond to lower frequencies.

14. The multiport inductor structure of claim 1, wherein:

terminals taken between outermost pair of the plurality of conductors comprise an inductor to be used at lowest frequency band;

terminals taken between intermediate pair of the plurality of conductors comprise an inductor to be used at intermediate frequency band; and

terminals taken between an innermost pair of the plurality of conductors comprise an inductor to be used at highest frequency band.

15. A multiport symmetric inductor structure, comprising:

a plurality of conductors structured and arranged into a plurality of turns and sections comprising metal wiring segments; and

input terminals connecting to different wiring structures comprising the metal wiring segments of each of the sections, such that the turns and the connection arrangement of the input terminals provide plural symmetric spirals between different selected pairs of input terminals.

16. The multiport symmetric inductor structure of claim 15, wherein the sections comprise three sections all having varying width and spacing between the metal wiring segments, where the width reduces going from outer to inner turns and spacing increases going from the outer to the inner turns.

17. The multiport symmetric inductor structure of claim 15, wherein the sections include a first section comprising serially stacked turns of wiring structures, a second section comprising parallel stacked turns of wiring structures and a third section comprising a plurality of non-stacked turns of wiring structures.

18. The multiport inductor structure of claim 17, wherein:

the first section of the serially stacked turns, the second section of the parallel stacked turns and the third section of the non-stacked metal wiring structures are provided in a spiral configuration;

each of the first section, the second section and the third section include metal wiring structures have varying width and spacing therebetween; and

a width of each metal wiring structure of the first section, the second section and the third section reduces as it goes toward a center and spacing between adjacent metal wiring structures increases as its goes toward the center.

19. The multiport inductor structure of claim 18, wherein at least one of the width and spacing of an upper turn of the first section is different from a lower turn for the metal wiring structures of the first section.

20. A multiport symmetric inductor structure comprising:

a plurality of conductors which are structured and arranged in spiral turns to obtain symmetry between a plurality of selected input terminals connecting to respective ones of the plurality of conductors, the plurality of conductors comprising;

a first section of serially stacked turns of metal wiring structures, each having segments on a first layer and a second layer, the segments of the first layer having a different width and spacing corresponding to the width and spacing on the second layer;

a second section of parallel stacked turns of metal wiring structures, each having segments on the first layer and the second layer, the segments of the first layer having a different width and spacing corresponding to the width and spacing on the second layer; and

a third section of non-stacked metal wiring structures; and

wherein symmetry between the selected input terminals comprise;

terminals taken between outermost pair of spirals;

terminals taken between intermediate pair of spirals; and

terminals taken between innermost pair of spirals.