阅读说明：本技术 一种具有高频互联功能的bga陶瓷封装结构 (BGA ceramic packaging structure with high-frequency interconnection function ) 是由 韦炜 王勇 张兴稳 孙彪 于 2020-11-20 设计创作，主要内容包括：本发明提出了一种具有高频互联功能的BGA陶瓷封装结构,包括盖板、芯片组合、陶瓷主体、BGA植球、母板、测试接头,其中陶瓷主体上设置腔体,所述腔体互相隔离,其内设置芯片组合；所述陶瓷主体顶部设置盖板实现芯片封装；所述陶瓷主体底部设置母板,所述母板与陶瓷主体底部通过BGA植球连接,母板侧面设置测试接头。本发明可补偿陶瓷封装和母板之间的平整度不一致性带来的距离差,提高焊接可靠性,并且增加了散热接触面,改善了散热效果。(The invention provides a BGA ceramic packaging structure with a high-frequency interconnection function, which comprises a cover plate, a chip combination, a ceramic main body, BGA embedded balls, a mother board and a test connector, wherein the ceramic main body is provided with cavities, the cavities are mutually isolated, and the chip combination is arranged in the cavities; a cover plate is arranged at the top of the ceramic main body to realize chip packaging; the bottom of the ceramic main body is provided with a mother board, the mother board is connected with the bottom of the ceramic main body through BGA (ball grid array) embedded balls, and the side surface of the mother board is provided with a test connector. The invention can compensate the distance difference caused by the inconsistency of the flatness between the ceramic package and the motherboard, improve the welding reliability, increase the heat dissipation contact surface and improve the heat dissipation effect.)

1. A BGA ceramic packaging structure with a high-frequency interconnection function is characterized by comprising a cover plate (1), a chip combination (3), a ceramic main body (4), BGA embedded balls (5), a mother board (6) and a test connector (7), wherein cavities are arranged on the ceramic main body (4), the cavities are mutually isolated, and the chip combination (3) is arranged in the cavities; the top of the ceramic main body (4) is provided with a cover plate (1) to realize chip packaging; the ceramic main body (4) bottom sets up mother board (6), mother board (6) are connected through BGA plant ball (5) with ceramic main body (4) bottom, and mother board (6) side sets up test joint (7).

2. The BGA ceramic package structure with the high-frequency interconnection function of claim 1, wherein the BGA ball-planting (5) uses a solder ball with a diameter of 0.3-0.76 mm.

3. The BGA ceramic package structure with high frequency interconnection function of claim 1, wherein the BGA ball-planting (5) uses a solder ball with a diameter of 0.5 mm.

4. The BGA ceramic package structure with the high-frequency interconnection function of claim 1, 2 or 3, wherein the BGA ball-planting (5) is made of Sn-Pb or Pb-free Sn-Ag-Cu mixed material.

5. BGA ceramic package structure with high-frequency interconnect function according to claim 1, characterized in that the ceramic main body (4) is made of HTCC material.

6. The BGA ceramic package structure with the high-frequency interconnection function of claim 1 or 5, wherein the ceramic main body (4) adopts a coaxial structure, takes ceramic as a medium, takes through holes arranged in a circular array as a shielding layer, takes the through holes at the position of the center of a circle as a signal conductor, and directly and vertically transmits the signal from the inside of the ceramic cavity to the bottom of the ceramic.

7. The BGA ceramic package structure with the high frequency interconnection function of claim 1 or 5, wherein the motherboard (6) adopts a coplanar waveguide structure or a strip line structure, wherein the coplanar waveguide structure is a planar sandwich structure with a middle conducting wire for signal transmission and two side ground plane patterns as shielding layers, and the strip line structure is a three-dimensional sandwich structure with a middle conducting wire for signal transmission and two upper and lower sides ground.

8. The BGA ceramic package structure with the high-frequency interconnection function of claim 1, wherein in the microwave and millimeter wave frequency band application, the BGA ceramic package structure is additionally provided with the enclosure frame (2), the internal structure of the enclosure frame (2) is consistent with the cavity of the ceramic main body (4), and the enclosure frame is arranged between the ceramic main body (4) and the cover plate (1) and used for providing a space allowance for the chip assembly (3).

9. The BGA ceramic package structure with the high-frequency interconnection function of claim 8, wherein the height of the enclosure frame (2) is 2 times of the cavity depth of the ceramic main body (4), and the cavity depth is 2-3 mm.

10. A packaging method, characterized in that packaging is performed based on the BGA ceramic package structure with high frequency interconnection function of any one of claims 1-9.

Technical Field

The invention relates to the technical field of ceramic packaging of integrated circuits, in particular to a BGA (ball grid array) ceramic packaging structure with a high-frequency interconnection function.

Background

With the high integration of high frequency circuits, high density devices need to be integrated into one package. The ceramic is used as an ideal main material for packaging, and the design and implementation method of the ceramic influences the quality of packaging performance. The traditional ceramic package, which uses the bottom integral welding such as lga (land grid array) package, has the following problems:

1. when the welding area is large, especially large-area welding exceeding 20mm multiplied by 20mm, the bottom surface can be warped due to the stress release problem in the sintering process of the ceramic material, so that the welding of the bottom surface has empty strands, and the welding reliability is reduced.

2. During plane welding, signals can be generally transmitted through the half-hole structure at the edge of the package and an external motherboard in a welding and interconnection mode, and internal high-frequency signals need to be routed to the edge of a device through long wiring, so that the influence is that for signals in a microwave frequency band, the signal loss is large, the mismatch is serious, and the isolation among multiple signals is not high, for example, in patent No. (CN 105047632A), a miniaturized high-isolation ceramic package structure.

Disclosure of Invention

The invention aims to provide a BGA ceramic packaging structure with a high-frequency interconnection function.

The technical solution for realizing the purpose of the invention is as follows: a BGA ceramic packaging structure with a high-frequency interconnection function comprises a cover plate, a chip combination, a ceramic main body, BGA ball-planting, a mother board and a test connector, wherein a cavity is arranged on the ceramic main body, the cavities are mutually isolated, and the chip combination is arranged in the cavity; a cover plate is arranged at the top of the ceramic main body to realize chip packaging; the bottom of the ceramic main body is provided with a mother board, the mother board is connected with the bottom of the ceramic main body through BGA (ball grid array) embedded balls, and the side surface of the mother board is provided with a test connector.

Furthermore, the BGA ball mounting adopts a solder ball with the diameter of 0.3-0.76 mm.

Furthermore, the BGA ball planting adopts a solder ball with the diameter of 0.5 mm.

Furthermore, the BGA ball-planting adopts tin-lead or lead-free tin-silver-copper mixed materials.

Further, the ceramic main body adopts HTCC materials.

Furthermore, the ceramic main body adopts a similar coaxial structure, takes ceramic as a medium, takes the through holes arranged in a circular array as a shielding layer, takes the through holes at the position of the circle center as a signal conductor, and directly and vertically transmits the signal to the bottom of the ceramic from the inside of the ceramic cavity.

Furthermore, the motherboard adopts a coplanar waveguide structure or a strip line structure, wherein the coplanar waveguide structure is a planar sandwich structure with a middle conducting wire for signal transmission and two side grounding plane patterns as shielding layers, and the strip line structure is a three-dimensional sandwich structure with a middle conducting wire for signal transmission and upper and lower sides grounding.

Further, in these application occasions of microwave millimeter wave frequency channel, BGA ceramic package structure adds establishes and encloses the frame, enclose the frame inner structure unanimous with ceramic subject's cavity, set up between ceramic subject and apron for provide the space allowance for the chip combination.

Furthermore, the height of the enclosing frame is 2 times of the depth of the cavity of the ceramic main body, and the depth of the cavity is 2-3 mm.

A packaging method is based on the BGA ceramic packaging structure with the high-frequency interconnection function for packaging.

Compared with the prior art, the invention has the following remarkable advantages: 1) the BGA welding process is combined with the ceramic packaging structure, so that the distance difference caused by the inconsistency of the flatness between the ceramic package and the motherboard can be compensated, the welding reliability is improved, and meanwhile, compared with the LGA packaging bottom surface and the grounding point welding, the area of the bottom surface can be fully utilized, the heat dissipation contact surface is increased, and the heat dissipation effect is improved. 2) The ceramic is internally provided with a coaxial structure + BGA solder balls + motherboard transmission lines, so that the loss caused by signal transmission can be effectively reduced, and in the process of multi-signal transmission, a good shielding effect can be formed in a three-dimensional space by adopting the form.

Drawings

Fig. 1 is an exploded view of a BGA ceramic package structure having a high frequency interconnection function according to the present invention.

FIG. 2 is a combination diagram of a BGA ceramic package structure with high frequency interconnection function according to the present invention.

Fig. 3 is a schematic diagram of isolation between adjacent leads.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

As shown in fig. 1, a BGA ceramic package structure with high frequency interconnection function includes a cover plate 1, a surrounding frame 2, a chip assembly 3, a ceramic main body 4, BGA ball-planting 5, a motherboard 6, and a test connector 7, wherein the ceramic main body 4 has cavities isolated from each other, and the internal structure of the surrounding frame (2) is consistent with the cavity structure of the ceramic main body (4).

The combination is as shown in fig. 2, a chip combination 3 is arranged in each cavity of a ceramic main body 4, the top of the chip combination is sealed by a cover plate 1, the bottom of the chip combination is connected with a motherboard 6 in a welding mode through a BGA ball-planting 5 array, and the BGA ball-planting 5 provides a radio frequency channel, a power supply channel and a heat dissipation channel.

In the method, when the bottom of the ceramic main body 4 is welded and interconnected with the motherboard 6 through the BGA ball-planting 5 array, the solder balls are in a semi-molten state after passing through a welding temperature region of a peak value and are respectively combined with an upper plane and a lower plane, and the distance difference caused by the inconsistency of the flatness between the ceramic package and the motherboard can be automatically compensated. In addition, the bottom surface adopts BGA welding, and the area of the bottom surface can be fully utilized relative to the welding of the LGA packaging bottom surface and a grounding point, so that the heat dissipation contact surface is increased, and the heat dissipation effect is improved.

As a preferred embodiment, the BGA ball-planting 5 can use a solder ball with a diameter of 0.3-0.76 mm, and the use of a solder ball with a diameter of 0.5mm is the best. The material aspect can be selected to be tin-lead or lead-free tin-silver-copper mixture, and the tin-lead solder Sn63Pb37 has the best effect. The design can be comprehensively considered and selected according to the working frequency, the packaging size and the welding process capability.

As a preferred embodiment, the ceramic main body 4 is designed to have a coaxial structure, the coaxial structure uses ceramic as a medium, through holes arranged in a circular array as a shielding layer, and through holes at the center of a circle as signal conductors, and the signal is directly and vertically transmitted to the bottom of the ceramic from the inside of the ceramic cavity, so that the coaxial structure has the advantages of short transmission distance and small signal insertion loss.

As a preferred embodiment, the motherboard 6 may adopt a coplanar waveguide structure, which is a planar sandwich with a middle conducting wire for signal transmission and two side ground plane patterns as shielding layers. The strip line structure can also be a three-dimensional sandwich structure with a middle conducting wire for transmitting signals and the upper side and the lower side of the sandwich structure. The configuration can be flexibly configured according to the situation.

As a preferred embodiment, the material of the ceramic body 4 can be selected to be HTCC (high temperature co-fired ceramic), which has a thermal conductivity of 20W/m.k, with good thermal conductivity, and this design is suitable for medium power applications below 10W.

As a preferred implementation, except for the microwave and millimeter wave frequency band, a certain space margin needs to be left in the installation space of the radio frequency chip and the filter to ensure that no reflection is generated in signal transmission, and the enclosure frame 2 needs to be installed, so that other situations can be omitted. Further preferably, enclose frame 2 optional metal frame, highly be the twice of inside ceramic cavity degree of depth, whole cavity height is 2~3mm, can satisfy the high frequency application requirement.

The packaging method based on the packaging structure comprises the following specific processes:

the ceramic substrate is used as a packaging main body, chip layout is arranged according to circuit design, and a cavity structure, circuit patterns of each layer and the like are designed based on the chip layout. Based on the design pattern, the circuit pattern is printed, ceramic slurry casting is carried out by adopting a film with surface treatment, and the ceramic main body is basically finished by cutting, punching, printing, laminating, hot cutting and high-temperature sintering the cast green ceramic chip according to the standard size. The top layers of the enclosure frame and the ceramic main body are sintered by adopting gold-tin solder, and the ceramic surface cavity and the metal enclosure frame jointly form a cavity capable of mounting a chip. Assembling a chip, pasting a piece, bonding and sealing a cap. And printing soldering flux or solder on the motherboard, and planting balls at the bottom of the ceramic packaging pad to corresponding positions by using a tool fixture. And optically aligning the ceramic package and connecting the motherboard, performing reflow soldering, and performing electrical inspection.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.