Low temperature co-fired ceramic substrates for power converters

• US 5,604,673 A
• Filed: 06/07/1995
• Issued: 02/18/1997
• Est. Priority Date: 06/07/1995
• Status: Expired due to Term

• Current Assignee: OL Security LLC (Intellectual Ventures LLC)
• Original Assignee: Hughes Electronics Corporation (Rtx Corporation)
• Inventors: Washburn, Robert D., McClanahan, Robert F., Shapiro, Andrew A.
• Primary Examiner(s): Krishnan, Aditya
• Application Number:
  US08/479,293
• Time in Patent Office: 622 Days
• Field of Search: 357/80, 357/74, 357/75, 357/81, 174/52, 174/4, 361/40, 361/386, 361/321, 361/398, 361/399, 361/400, 361/750-751, 361/782, 361/783, 361/795, 361/811, 336/200, 336/215, 363/20, 363/21, 363/147, 3/335
• US Class Current: 363/147
• CPC Class Codes: H01L 23/5383 Multilayer substrates H01L23/5385 takes precedence; multilayer metallisation on monolayer substrates H01L23/538
• CPC Class Codes: H01L 25/16 the devices being of types provided for in two or more different main groups of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. forming hybrid circuits
• 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
• CPC Class Codes: H01L 2924/09701 Low temperature co-fired ceramic [LTCC]
• CPC Class Codes: H01L 2924/3011 Impedance
• CPC Class Codes: H05K 1/16 incorporating printed electric components, e.g. printed resistor, capacitor, inductor

Abstract

Electronic power conversion circuitry, for frequencies not exceeding 30 MHz, is manufactured using the benefits of low temperature co-fired ceramic substrates to provide interconnection between the discrete components of the power conversion circuit, and integrate various non-semiconductor devices into the body of the low temperature co-fired ceramic structure, such as resistors, capacitors, inductors and transformers. Use of a low temperature co-fired ceramic structure as a substrate on and within which power conversion circuitry is formed allows selection of various conductive and resistive inks to precisely form interconnection circuitry and selected non-semiconductor components which improves the stability and reduces the cost of power conversion circuits.

Claims

1. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate comprising:

(1) a low temperature co-fired ceramic substrate comprising multiple layers; and

(2) an electronic power converter circuit wherein a selected plurality of the passive components thereof are chosen from the group consisting of capacitors, resistors, inductors, and transformers and are formed as an integral part of one or more of said multiple layers of said low-temperature co-fired ceramic substrate.

2. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 1, and further comprising at least one conductive layer located on or within the low temperature co-fired ceramic substrate, which electrically connects the circuitry of the electronic power converter circuit.

3. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 2, and further comprising a plurality of conductive pads for electronically connecting the components of the electronic power converter circuit to said conductive layer.

4. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 3, and further comprising at least one non-semiconductor element formed within said low temperature ceramic substrate.

5. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 3, and further comprising at least one cavity formed within said low temperature co-fired ceramic substrate.

6. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 5, and further comprising at least one thermal via formed within said low temperature co-fired ceramic substrate.

7. An electronic power converter circuit formed within a low temperature co-fired ceramic substrate as described in claim 1, and further comprising at least one discrete component mounted on said low temperature co-fired ceramic substrate.

8. A low temperature co-fired ceramic structure as defined in claim 1 in which said passive components comprise a power oscillator.

9. A low temperature co-fired ceramic structure as defined in claim 1, in which said passive components comprise an RF amplifier.

10. In a power conversion system incorporating a low temperature co-fired ceramic structure containing first and second filter networks,

a low temperature co-fired ceramic structure containing a plurality of buried capacitor, buried inductor and buried resistor elements comprising:

a plurality of capacitors, inductors and resistors configured to form a first filter network and a plurality of capacitors, inductors and resistors configured to form a second filter network; and

an active circuit amplifier means mounted on the external surface of said co-fired ceramic structure, the input to said amplifier means being supplied by the output of said first filter network, the input of said first filter network being supplied by external means, said output of said amplifier means driving the input of said second filter network.

11. In the power conversion system of claim 10, said low temperature co-fired ceramic structure comprising additionally:

transformer means coupled to said first filter network.

12. In the power conversion system of claim 11, said low temperature co-fired ceramic structure comprising additionally:

said transformer means buried within said structure.

13. In the power conversion system of claim 10, said low temperature co-fired ceramic structure comprising additionally:

transformer means coupled to said second filter network.

14. In the power conversion system of claim 13, said low temperature co-fired ceramic structure comprising additionally:

said transformer means buried within said structure.

15. A circuit for use in an electronic power converter formed on and within a low temperature co-fired ceramic substrate and comprising;

a low temperature co-fired ceramic substrate comprising multiple layers;

a plurality of circuit components formed as an integral part of one or more of said multiple layers of said low temperature co-fired ceramic substrate; and

a plurality of circuit components mounted on or within said low temperature co-fired ceramic substrate.

16. A low temperature co-fired ceramic structure containing buried passive circuitry comprising:

a low temperature co-fired ceramic substrate comprising multiple layers; and

passive circuitry formed as an integral part of one or more of said multiple layers of said substrate to provide said buried passive circuitry, wherein;

said passive circuitry includes at least one component selected from the class consisting of resistors, capacitors, inductors, and transformers;

said buried passive components being surrounded on all sides by non-conductive ceramic material;

said buried passive components being interconnected with other buried passive components by way of at least one interconnection means selected from the class consisting of vias and conductive structures;

said buried passive components being connected to other components which are not buried through interconnection contact pads which are located on a surface of said low temperature co-fired ceramic structure.