阅读说明：本技术 一种rf射频装置及其制造方法 (RF radio frequency device and manufacturing method thereof ) 是由 陈洁 于 2019-09-23 设计创作，主要内容包括：本发明提供了一种RF射频装置及其制造方法,本发明的RF射频装置采用RF器件的封装块与线圈结构的封装块进行混合键合,可以实现产率的提高,且可以避免现有技术中在RF芯片的封装体上沉积集成线圈所带来的多层之间的应力问题,以及多层层叠沉积所带来的不可靠性。(The RF radio frequency device of the invention adopts the packaging block of the RF device and the packaging block of the coil structure to carry out mixed bonding, can realize the improvement of the yield, and can avoid the stress problem among multiple layers caused by the deposition of an integrated coil on the packaging body of an RF chip in the prior art and the unreliability caused by the deposition of multiple layers in a stacking way.)

1. An RF radio frequency device, comprising:

a circuit board having opposing first and second surfaces;

a plurality of radio frequency devices fixed on the first surface and electrically connected to the circuit board;

a first encapsulation resin sealing the plurality of radio frequency devices and the first surface;

a plurality of first through holes disposed in the first encapsulation resin and electrically connected to the plurality of radio frequency devices;

a wiring layer disposed on the first encapsulation resin and electrically connected to the plurality of first through holes;

a first insulating layer covering the wiring layer;

an electromagnetic shielding layer disposed on the first insulating layer and patterned to form a plurality of void portions;

a second insulating layer covering the electromagnetic shielding layer;

the antenna component is arranged on the second insulating layer and comprises a coil;

a plurality of connection posts electrically connecting the wiring layer and the coil, and passing through the first insulating layer, the second insulating layer, and the plurality of void portions.

2. The RF radio frequency device of claim 1, wherein: the radio frequency devices include amplifiers, filters, antenna switches, and the like.

3. The RF radio frequency device of claim 1, wherein: the antenna assembly further comprises a protective film and a second packaging resin arranged on one surface of the protective film, wherein the coil is arranged between the protective film and the second packaging resin, and the connecting posts further penetrate through the second packaging resin.

4. The RF radio frequency device according to claim 3, wherein: the second packaging resin and the second insulating layer are tightly jointed without a gap.

5. The RF radio frequency device of claim 1, wherein: the first insulating layer and the second insulating layer are polymer materials.

6. A method of manufacturing an RF radio frequency device, comprising:

(1) fixing a plurality of radio frequency chips on a circuit board, wherein the radio frequency chips are electrically connected to the circuit board through welding fluxes or welding wires;

(2) forming a first packaging resin for sealing the radio frequency chips on the circuit board in an injection molding mode, and forming a plurality of first through holes, wherein the first through holes are arranged in the first packaging resin and electrically connected with the radio frequency devices;

(3) depositing metal on the first packaging resin and patterning to form a wiring layer, wherein the wiring layer is electrically connected with the plurality of first through holes;

(4) depositing a first insulating layer on the wiring layer, and then depositing a metal layer on the wiring layer;

(5) patterning the metal layer to form an electromagnetic shielding layer having a plurality of void portions;

(6) depositing a second insulating layer on the electromagnetic shielding layer;

(7) forming a second through hole penetrating the first insulating layer and the second insulating layer through the plurality of void portions to electrically connect the wiring layers, at which time a first portion to be bonded is formed;

(8) providing a carrier plate, and forming a protective film on the carrier plate;

(9) depositing a conductive layer on the protective film and patterning to form a plurality of coils;

(10) a second sealing resin is formed on the carrier plate in an injection molding mode so as to seal the plurality of coils;

(11) forming a plurality of third through holes in the second sealing resin, wherein the plurality of third through holes are respectively electrically connected with the plurality of coils, and a second part to be bonded is formed at the moment;

(12) and carrying out hybrid bonding on the first part to be bonded and the second part to be bonded, so that the second through hole and the third through hole are bonded together and electrically connected, and the second packaging resin is tightly bonded with the second insulating layer without a gap.

7. The method of claim 6, wherein: the second via hole is formed by etching the first and second insulating layers and then performing electro-coppering, and the third via hole is formed by etching the second sealing resin and then performing electro-coppering.

8. The method of claim 6, wherein: also include removing the carrier plate.

9. The method of claim 6, wherein: forming the electromagnetic shielding layer includes depositing a metal layer on the first insulating layer, and then patterning to form a plurality of void portions, the metal layer being an electromagnetic shielding material.

10. The method of claim 6, wherein: the hybrid bonding is carried out under pressurized heating conditions.

Technical Field

The invention relates to the field of integrated circuit package manufacturing, in particular to an RF (radio frequency) device and a manufacturing method thereof.

Background

In the existing RF radio frequency device, the RF control chip is first subjected to plastic package, then a redistribution layer is formed on the plastic package body, and an RF coil structure is formed on or in the redistribution layer. Although this method achieves an improvement in the integration level, the process requires encapsulation of the plastic package body first and then deposition of redistribution layers, which results in a reduction in the yield, and in this sequence, the overall test can only be performed at the end, which is disadvantageous for the yield.

Disclosure of Invention

In order to solve the above problems, the present invention provides an RF radio frequency device, comprising:

a circuit board having opposing first and second surfaces;

a plurality of radio frequency devices fixed on the first surface and electrically connected to the circuit board;

a first encapsulation resin sealing the plurality of radio frequency devices and the first surface;

a plurality of first through holes disposed in the first encapsulation resin and electrically connected to the plurality of radio frequency devices;

a wiring layer disposed on the first encapsulation resin and electrically connected to the plurality of first through holes;

a first insulating layer covering the wiring layer;

an electromagnetic shielding layer disposed on the first insulating layer and patterned to form a plurality of void portions;

a second insulating layer covering the electromagnetic shielding layer;

the antenna component is arranged on the second insulating layer and comprises a coil;

a plurality of connection posts electrically connecting the wiring layer and the coil, and passing through the first insulating layer, the second insulating layer, and the plurality of void portions.

The present invention also provides a method of manufacturing an RF radio frequency device, comprising:

(1) fixing a plurality of radio frequency chips on a circuit board, wherein the radio frequency chips are electrically connected to the circuit board through welding fluxes or welding wires;

(2) forming a first packaging resin for sealing the radio frequency chips on the circuit board in an injection molding mode, and forming a plurality of first through holes, wherein the first through holes are arranged in the first packaging resin and electrically connected with the radio frequency devices;

(3) depositing metal on the first packaging resin and patterning to form a wiring layer, wherein the wiring layer is electrically connected with the plurality of first through holes;

(4) depositing a first insulating layer on the wiring layer, and then depositing a metal layer on the wiring layer;

(5) patterning the metal layer to form an electromagnetic shielding layer having a plurality of void portions;

(6) depositing a second insulating layer on the electromagnetic shielding layer;

(7) forming a second through hole penetrating the first insulating layer and the second insulating layer through the plurality of void portions to electrically connect the wiring layers, at which time a first portion to be bonded is formed;

(8) providing a carrier plate, and forming a protective film on the carrier plate;

(9) depositing a conductive layer on the protective film and patterning to form a plurality of coils;

(10) a second sealing resin is formed on the carrier plate in an injection molding mode so as to seal the plurality of coils;

(11) forming a plurality of third through holes in the second sealing resin, wherein the plurality of third through holes are respectively electrically connected with the plurality of coils, and a second part to be bonded is formed at the moment;

(12) and carrying out hybrid bonding on the first part to be bonded and the second part to be bonded, so that the second through hole and the third through hole are bonded together and electrically connected, and the second packaging resin is tightly bonded with the second insulating layer without a gap.

The invention has the following advantages:

the RF radio frequency device of the invention adopts the packaging block of the RF device and the packaging block of the coil structure to carry out mixed bonding, can realize the improvement of the yield, and can avoid the problem of stress among multiple layers caused by the deposition of an integrated coil on the packaging body of the RF chip in the prior art and the unreliability caused by the multilayer laminated deposition. In addition, the packaging blocks of the RF device and the packaging blocks of the coil structure can be respectively tested and then bonded, so that the yield can be improved. And an electromagnetic shielding layer is formed above the redistribution layer, so that bonding stress can be reduced, and the radio frequency chip is protected.

Drawings

FIG. 1 is a cross-sectional view of an RF radio frequency device of the present invention;

fig. 2-13 are schematic diagrams of a method of manufacturing an RF device according to the present invention.

Detailed Description

The RF device of the present invention is different from the prior art in that the RF coil is integrated in the redistribution layer or the interlayer dielectric layer, and in the manufacturing process, the metal layer and/or the dielectric layer are sequentially deposited in a lamination manner, and the RF coil is formed in the lamination deposition. The invention is formed by pressing the two parts, can independently manufacture a single package, improves the yield and can realize the yield of the package.

Referring to fig. 1, the first bonding portion includes a wiring board 10, a plurality of radio frequency devices 11 and 12, a first encapsulation resin 13, and a redistribution layer structure (see the manufacturing process for details). The wiring board 10 includes an interposer substrate, a printed circuit board, a package substrate, etc., which has first and second opposing surfaces. The circuit board 10 is used for externally connecting other components, can be additionally provided with external connecting terminals, and can be internally provided with a lead layer and a through hole structure.

The radio frequency devices 11, 12 include amplifiers, filters, antenna switches, etc., which are mainly used for processing radio frequency signals or controlling the package circuits. The rf devices 11, 12 may be more than two, for example, three, four, etc., which are fixed on the first surface and electrically connected to the circuit board 10.

A first encapsulation resin 13 sealing the radio frequency devices 11, 12 and the first surface; the material of the first encapsulating resin 13 is a photo-curing or thermosetting resin, such as PI, PBO, epoxy resin, silicone resin, and the like. A plurality of first through holes 14 are formed in the first encapsulation resin 13, and the plurality of first through holes 14 electrically connect the plurality of radio frequency devices.

The redistribution layer comprises a wiring layer 15, a first insulating layer 16 and a second insulating layer 20, wherein the wiring layer 15 is arranged on the first packaging resin 13 and is electrically connected with the plurality of first through holes 14; the first insulating layer 16 covers the wiring layer 15; a second insulating layer 20 covering the first insulating layer 16; the first insulating layer and the second insulating layer are made of polymer materials and have certain stress buffering effect.

The electromagnetic shielding layer 18 located between the first insulating layer 16 and the second insulating layer 20 and patterned to form a plurality of void portions 19; the plurality of void portions 19 are adapted to allow subsequent electrical connections (i.e., connection studs 40) to pass therethrough. The electromagnetic shielding layer 18 is made of a metal material, such as fe, co, ni, and alloys thereof, which not only has the function of preventing external signal interference, but also can reduce stress during bonding, and prevent stress from damaging the rf device.

The second bonding portion includes an antenna assembly including a carrier plate 30, a protective film 31, a coil 32, and a second encapsulation resin 33, wherein the protective film 31 is formed on the carrier plate 30, and the coil 32 is formed on the protective film 32. The coil 32 is a spiral coil structure and is formed by depositing a metal layer and then etching. The second encapsulation resin 33 completely covers the coil 32, and a plurality of connection posts 40 electrically connect the wiring layer 15 and the coil 32, the plurality of connection posts 40 passing through the first insulating layer 16, the second insulating layer 20, and the plurality of void portions 19.

Wherein the first bonding portion and the second bonding portion are laminated together by thermocompression bonding, and the second encapsulation resin 33 and the second insulating layer 20 are tightly bonded without a gap.

The manufacturing method of the RF device can be seen in fig. 2 to 13, which includes:

referring to fig. 1, a plurality of rf chips 11, 12 are fixed on a circuit board 10, and the plurality of rf chips 11, 12 are electrically connected to the circuit board 10 by solder or bonding wires.

Referring to fig. 2, a first encapsulation resin 13 encapsulating the plurality of rf chips 11, 12 is injection molded on the wiring board 10, and a plurality of first through holes 14 are formed, the plurality of first through holes 14 being disposed in the first encapsulation resin 13 and electrically connecting the plurality of rf devices 11, 12.

Referring to fig. 4, a metal is deposited on the first encapsulation resin 13 and patterned to form a wiring layer 15, and the wiring layer 15 is electrically connected to the plurality of first through holes 14.

Referring to fig. 5, a first insulating layer 16 is deposited on the wiring layer 15, and then a metal layer 17 is deposited on the wiring layer 16.

Referring to fig. 6, the metal layer 17 is patterned to form an electromagnetic shielding layer 18 having a plurality of void portions 19; forming the electromagnetic shielding layer includes depositing a metal layer on the first insulating layer, and then patterning to form a plurality of void portions, the metal layer being an electromagnetic shielding material.

Referring to fig. 7, a second insulating layer 20 is deposited on the electromagnetic shielding layer 18.

Referring to fig. 8, a second via hole 21 is formed, the second via hole 21 penetrating the first insulating layer 16 and the second insulating layer 20 through the plurality of void portions 19 to electrically connect the wiring layer 15, at which time a first portion to be bonded is formed; the second via hole 21 is formed by etching the first and second insulating layers 16, 20 and then performing copper electroplating, and the third via hole 34 is formed by etching the second sealing resin 33 and then performing copper electroplating.

Referring to fig. 9, a carrier 30 is provided, and a protective film 31 is formed on the carrier 30.

Referring to fig. 10, a conductive layer is deposited on the protective film 31 and patterned to form a plurality of coils 32.

Referring to fig. 11, a second sealing resin 33 is injection-molded on the carrier plate 30 to seal the plurality of coils 32.

Referring to fig. 12, a plurality of third through holes 34 are formed in the second sealing resin 33, and the plurality of third through holes 34 are electrically connected to the plurality of coils 32, respectively, at this time, a second portion to be bonded is formed.

Referring to fig. 13, the first portion to be bonded and the second portion to be bonded are hybrid-bonded, so that the second through hole 21 and the third through hole 34 are bonded together and electrically connected, and the second encapsulation resin 33 and the second insulating layer 20 are tightly bonded without any gap. The hybrid bonding is carried out under pressurized heating conditions.

The carrier board 30 (not shown) is removed to achieve thinning, and the protective film 31 is sufficient to protect the coil 32.

Finally, it should be noted that: it should be understood that the above examples are only for clearly illustrating the present invention and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the scope of the invention.