Circuit element having at least two physically separated coil-layers

• US 5,844,451 A
• Filed: 02/25/1994
• Issued: 12/01/1998
• Est. Priority Date: 02/25/1994
• Status: Expired due to Term

• Current Assignee: MACOM Technology Solutions Holdings, Inc.
• Original Assignee: The Whitaker Corporation (Meggitt PLC)
• Inventors: Murphy, Michael T.
• Primary Examiner(s): LEE, BENNY T
• Application Number:
  US08/201,623
• Time in Patent Office: 1,740 Days
• Field of Search: 333/185, 333/175, 333/245, 336/200
• US Class Current: 333/185
• CPC Class Codes: H03H 2001/0085 Multilayer, e.g. LTCC, HTCC, green sheets inside PCB filters H05K
• CPC Class Codes: H03H 7/0115 comprising only inductors and capacitors H03H7/075, H03H7/09, H03H7/12, H03H7/13 take precedence
• CPC Class Codes: H03H 7/175 Series LC in series path H03H7/1783 takes precedence

Abstract

A novel circuit element is provided which exhibits the characteristics of a conventional series-connected capacitor-inductor network, but consumes only about half the surface area required by the conventional network. Particular utility of the present invention is found in the area of impedance matching in monolithic microwave integrated circuits, although other utilities are contemplated, such as, e.g. in other integrated circuit applications.

Claims

1. A circuit element having a surface area M, and comprising:

a. a first coiled-layer of conductive material;

b. a layer of dielectric material disposed upon said first conductive layer; and

c. a second coiled-layer of conductive material disposed upon said layer of dielectric material, said layer of dielectric material physically separating and isolating said first coiled-layer from said second coiled-layer such that said first coiled-layer is physically unconnected to said second coiled-layer and also such that interaction between said first coiled-layer and second coiled-layer is substantially only electromagnetic in nature;

said element exhibiting electrical impedance characteristics comparable to electrical impedance characteristics exhibited by a conventional parallel-plate capacitor connected in series to a spiral inductor network having a surface area substantially equal to 2M.

2. An element according to claim 1, wherein said first coiled-layer has a number of turns which are different from a number of turns of said second coiled-layer.

3. An element according to claim 1, wherein said first coiled-layer has turns equal in number to the number of turns of said second coiled-layer.

4. An element according to claim 1, wherein said first and second coiled-layers are centered about a common imaginary axis running vertically through respective centers of said coiled layers.

5. An element according to claim 1, wherein said first and second coiled-layers are centered about non-coinciding respective imaginary axes running vertically through respective centers of said coiled-layers.

6. An element according to claim 1, wherein at least one of said coiled-layers has between 2.5 and 6.5 turns.

7. An element according to claim 1, having two or more terminals connected to said coiled-layers.

8. An element according to claim 1, wherein said dielectric layer comprises at least one material selected from the group consisting of silicon nitride, silicon dioxide, and a polyimide.

9. An element according to claim 1, wherein said dielectric layer comprises silicon nitride.

10. An element according to claim 1, wherein said first and second coiled-layers respectively have different coil dimensions.

11. An element according to claim 1, wherein said first and second coiled-layers respectively have similar coil dimensions.

12. An element according to claim 1, wherein said first and second coiled-layers are respectively comprised of different conductive materials.

13. An element according to claim 1, wherein said first and second coiled-layers are respective comprised of the same conductive material.

14. An element according to claim 1, wherein at least one of said first and second coiled-layers comprises at least one material selected from the group consisting of gold, aluminum and silver.

15. A circuit element, and comprising:

a. a first coiled-layer of a first conductive material having a first number of turns;

b. a layer of dielectric material disposed upon said first coiled-layer;

c. a second coiled-layer of a second conductive material disposed upon said layer of dielectric material and having a second number of turns, said dielectric layer physically separating and isolating said coiled-layers such that said coiled-layers are physically unconnected to one another and also such that interaction between said coiled-layers is substantially only electromagnetic in nature;

said element having a surface area equal to M and exhibiting electrical impedance characteristics comparable to electrical impedance characteristics exhibited by a conventional parallel-plate capacitor connected in series to a spiral network having a surface area about equal to 2M.

16. An element according to claim 15, wherein said first and second conductive materials are different from each other.

17. An element according to claim 15, wherein said dielectric material comprises at least one material selected from the group consisting of silicon nitride, silicon dioxide, and a polyimide.

18. An element according to claim 15, wherein said dielectric layer comprises silicon nitride.

19. An element according to claim 15, wherein at least one of said first and second conductive materials comprises at least one material selected from the group consisting of gold, aluminum and silver.

20. An element according to claim 15, wherein said first and second coiled-layers respectively have different coil dimensions.

21. An element according to claim 15, wherein said first and second coiled layers respectively have similar coil dimensions.

22. An element according to claim 15, wherein said first and second number of turns are different.

23. An element according to claim 15, wherein said first and second number of turns are equal to each other.

24. An element according to claim 15, wherein said first and second coiled-layers are centered about a common imaginary axis running vertically through respective centers of said coiled-layers.

25. An element according to claim 15, wherein said first and second coiled-layers are centered about non-coinciding imaginary axes running vertically through respective centers of said coiled-layers.

26. An element according to claim 15, wherein said numbers of turns are between 2.5 and 6.5 turns.

27. An element according to claim 15, having two or more terminals connected to said coiled-layers.

28. An element according to claim 15, wherein said first and second conductive materials are the same.

29. An electronic device, and comprising:

a. at least one circuit element including a first coiled-layer of conductive material, a layer of dielectric material disposed upon said first conductive layer, a second coiled-layer of conductive material disposed upon said layer of dielectric material, wherein said first and second coiled-layers are physically completely separated and isolated from each other by the dielectric material such that said coiled-layers are totally unconnected to each other through and adjacent said dielectric layer and also such that interaction between said coiled-layers is substantially only electromagnetic in nature, said element has a surface area equal to M and exhibits electrical impedance characteristics comparable to electrical impedance characteristics exhibited by a conventional parallel-plate capacitor connected in series to a spiral inductor network having a surface area about equal to 2M; and

b. at least one other circuit element connected to one of said two coiled-layers at a predetermined place thereon whereby to provide a desired bias level to said one circuit element when a biasing source is connected to said other circuit element.

30. A device according to claim 29, wherein said at least one other circuit element comprises a transistor.

31. A device according to claim 29, wherein said at least one other circuit element comprises a resistive element.

32. A device according to claim 29, wherein said at least one other circuit element comprises a capacitor.

33. A circuit network comprising a plurality of circuit elements, each circuit element including

a first coiled-layer of conductive material, a layer of dielectric material disposed upon said first conductive layer, a second coiled-layer of conductive material disposed upon said layer of dielectric material, wherein said first and second coiled-layers are physically separated and isolated from each other by the dielectric material such that said first and second coiled-layers are totally unconnected to each other through and adjacent said dielectric layer and also such that interaction between said first and second coiled-layers is substantially only electromagnetic in nature, said element has a surface area equal to M and exhibits electrical impedance characteristics comparable to electrical impedance characteristics exhibited by a conventional parallel-plate capacitor connected in series to a spiral inductor network having a surface area about equal to 2M, said circuit elements being at least partially separated from each other by respective additional layers of insulating material.

34. A circuit network comprising a plurality of circuit elements, each said circuit element including a first coiled-layer of conductive material, a layer of dielectric material disposed upon said first conductive layer, a second coiled-layer of conductive material disposed upon said layer of dielectric material, said first and second coiled-layers being physically separated and isolated from each other by the dielectric material such that said first and second coiled-layers are totally unconnected to each other and also such that interaction between said first and second coiled-layers is substantially only electromagnetic in nature, and said element has a surface area equal to M and exhibits electrical impedance characteristics comparable to electrical impedance characteristics exhibited by a conventional paralle-plate capacitor connected in series to a spiral inductor network having a surface area about equal to 2M, said circuit elements being at least partially separated from each other by respective additional layers of insulating material.