Vertically Stacked RF Package Layout for Low-Nonlinearity Signals
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Solution Overview
Problem
Microelectronics packages with vertically stacked devices face challenges such as non-linearity in RF signal transmission due to interference from surrounding structures and high-precision alignment requirements, leading to increased costs and potential thermal issues during fabrication.
Innovation Solution
The package design features a 'face-up' configuration where the RF device's functional layer faces the same direction as the controller device's functional layer, with an adhesive layer for coupling instead of soldering, and a routing layer for direct signal transmission, using a molding compound to reduce RF coupling and simplify the fabrication process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-precision alignment is used to bond MEMS device and controller chip, then bonding reliability is improved, but manufacturing cost increases and fabrication complexity increases
Solution Approach 1:
The patent introduces a base layer as an intermediary component between the MEMS device and controller chip. This base layer provides a common reference plane that simplifies alignment during bonding, reducing the need for high-precision alignment mechanisms while maintaining bonding reliability. The base layer acts as a mediator that absorbs alignment tolerances and facilitates easier assembly.
2Device complexity
If traditional RF signal transmission path is used through controller chip, then device integration is improved, but RF signal linearity deteriorates due to interference
Solution Approach 1:
The patent segments the RF signal transmission path from the control signal transmission path. The RF signal is transmitted directly from the MEMS device through dedicated RF signal transmission lines to the external circuit, separate from the controller chip. This segmentation prevents the RF signal from passing through the controller chip's digital circuits, eliminating interference and non-linearity while maintaining device integration through the base layer.
3Area of stationary object
If vertically stacked configuration is used, then footprint area is reduced, but thermal management difficulty increases
Solution Approach 1:
The patent applies local quality by providing enhanced thermal management specifically at the base layer where heat generation occurs. The base layer is designed with improved thermal conductivity and heat dissipation structures at the critical heat-generating interfaces, while other parts of the device maintain the compact stacked configuration. This localized thermal management approach enables vertical stacking without compromising overall thermal performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces RF signal non-linearity, lowers production costs, and improves thermal management by allowing direct signal transmission and easier handling of smaller chips, while maintaining a low profile and efficient electrical connections.
Implementation Method 1
an adhesive layer for coupling instead of soldering
Data Source
AI summary
A package is provided. The package includes a first semiconductor device having a first functional layer. The first functional layer includes a first functional component. The package also includes a second semiconductor device over the first semiconductor device. The second semiconductor device includes a second functional layer having a second functional component. The second functional layer is over a base layer. The base layer is coupled to the second functional layer on a first surface, and is coupled to the first functional layer on a second surface. The first surface and the second surface are on opposite sides of the base layer.