SIP packaging method for realizing electromagnetic shielding

Abstract

The invention discloses a SIP packaging method for realizing electromagnetic shielding. Surface metallization is adopted traditionally to prevent radiation interference, and a size of module connection is increased. The method comprises the steps that firstly, upper and lower surfaces of an MCU chip and a Flash storage chip in an SIP module are smeared with absorbing materials in a full-surface mode to form a shielding layer, and the adopted absorbing materials are graphene; the MCU chip and the Flash memory chip are connected by adopting an SPI bus so as to communicate with each other by adopting an up-and-down laminated packaging method; and then the MCU chip is connected with a substrate in a forward bonding mode, and the Flash memory chip is connected with the substrate in a reverse bonding mode. By using the method, electromagnetic waves can be effectively absorbed, an electromagnetic field permeating into the chip is reduced, signal transmission quality is improved, and an EMI problem is reduced. And a lead is bonded in a reverse manner so that a height of stacked packaging can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of chips, in particular to the technical field of chip packaging, and relates to a SIP packaging method for realizing electromagnetic shielding. Background technique [0002] With the further improvement of the integration level of two-dimensional integrated circuits, the semiconductor industry is approaching the bottleneck of the expansion of transistors, and three-dimensional (3D) integration technology is regarded as a promising solution to extend Moore's law for the next generation of semiconductor technology . Chip stack packaging is a three-dimensional encapsulation technology, which can integrate functional chips such as processors, memory chips, and encryption chips into one package to achieve a complete function, making integrated circuits continue to be miniaturized, high-performance, and high-end. Integration and low-cost development. [0003] However, new applications place new demands on the e...

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Problems solved by technology

[0004] The traditional solution to external radiation is to metallize the surface of SIP (System In a Package) module products. Although this solution slows down the radiation interference of the external electromagnetic environment on the SIP internal chip to a certain extent, it increases the The size of the connection between the PCB board and the SIP module is not conducive to the final miniaturization trend of the product

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