Microwave monolithic integrated circuit package

• US 6,873,044 B2
• Filed: 05/22/2001
• Issued: 03/29/2005
• Est. Priority Date: 09/11/2000
• Status: Expired due to Term

• Current Assignee: Reveal Imaging, LLC
• Original Assignee: Xytrans, Inc.
• Inventors: Ammar, Dan F.
• Primary Examiner(s): Eckert, George
• Assistant Examiner(s): Lee, Eugene
• Application Number:
  US09/862,982
• Publication Number:
  US 20020030269A1
• Time in Patent Office: 1,407 Days
• Field of Search: 257/728, 257/680, 257/686, 257/684, 257/704, 257/707, 257/706, 257/731
• US Class Current: 257/728
• CPC Class Codes: H01L 23/492 Bases or plates or solder therefor
• CPC Class Codes: H01L 23/4924 characterised by the materials
• CPC Class Codes: H01L 23/66 High-frequency adaptations
• 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 2924/14 Integrated circuits

Abstract

A microwave monolithic integrated circuit (MMIC) package includes a MMIC and a base plate that is matched as to its coefficient of thermal expansion (CTE) with the MMIC. A solder preform is contained on the base plate. The MMIC is mounted on the solder preform. A chip cover covers the MMIC and are configured with respective portions that engage each other such that any pads on the MMIC are exposed for wire and ribbon bonding. The base plate and MMIC are secured together by a solder flow process from the solder preform.

Claims

1. A microwave monolithic integrated circuit (MMIC) package comprising:

a single MMIC including a plurality of pads forming chip input and output pads and DC pads;

a base plate that is matched as to its coefficient of thermal expansion (CTE) with the MMIC;

a solder preform contained on the base plate, said MMIC being mounted on the solder preform; and

a chip cover having openings and covering the MMIC to form a MMIC package that can be automatically picked and placed, wherein the base plate and chip cover are configured with respective portions that engage each other and such that the chip input and output and DC pads on said MMIC are directly exposed to atmosphere through openings of the chip cover for wire and ribbon bonding, wherein the base plate and MMIC are secured together by a solder flow process from said solder preform.

2. A microwave monolithic integrated circuit package according to claim 1, wherein said base plate is formed from one of copper tungsten (CuW) or aluminum silicone (AlSi) alloy.

3. A microwave monolithic integrated circuit package according to claim 1, wherein said base plate is about 10 to about 15 mil thick.

4. A microwave monolithic integrated circuit package according to claim 1, wherein said chip cover is formed of plastic.

5. A microwave monolithic integrated circuit package according to claim 1, wherein said solder preform is formed from a gold-tin alloy.

6. A microwave monolithic integrated circuit package according to claim 1, wherein said solder preform is about 1 to about 2 mil thick.

7. A microwave monolithic integrated circuit package according to claim 1, wherein said base plate and chip cover are secured to each other by the solder preform during a solder flow process.

8. A microwave monolithic integrated circuit package according to claim 1, wherein said base plate includes side rails that engage said chip cover.

9. A microwave monolithic integrated circuit package according to claim 1, wherein and said chip cover includes overlap rails that engage said chip cover.

10. A microwave monolithic integrated circuit (MMIC) package comprising:

a single MMIC including a plurality of pads forming chip input and output pads and DC pads;

a substantially rectangular configured base plate that is matched as to its coefficient of thermal expansion (CTE) with the MMIC, said base plate including opposing side rails that extend along a portion of formed edges;

a solder preform contained on the base plate, said MMIC being mounted on the solder perform; and

a chip cover having openings and covering the MMIC to form a package that can be automatically picked and placed, and secured on said side rails of said base plate, and having overlap legs extending down to said base plate, wherein the base plate, side rails, chip cover and overlap legs are configured such that the chip input and output and DC pads on said MMIC are directly exposed to atmosphere through openings of the chip cover for wire and ribbon bonding.

11. A microwave monolithic integrated circuit package according to claim 10, wherein said base plate is formed from one of copper tungsten (CuW) or aluminum silicon (AlSi) alloy.

12. A microwave monolithic integrated circuit package according to claim 10, wherein said base plate is about 10 to about 15 mil thick.

13. A microwave monolithic integrated circuit package according to claim 10, wherein said solder preform is about 1 to about 2 mil thick.

14. A microwave monolithic integrated circuit package according to claim 10, wherein said base plate and MMIC are secured together by a solder flow process with said solder preform.

15. A microwave monolithic integrated circuit package according to claim 10, wherein said base plate and top cover are secured together by a solder flow process with said solder preform.