Double-Side Silicon MOS Integration for RF Front-End Modules
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional RF front-end modules in semiconductor technology face issues such as large size, low signal-to-noise ratio, high power consumption, and complex, costly manufacturing processes due to the use of multiple separate chips connected through wire bonding in system-in-package configurations.
Innovation Solution
Integration of various transistors and passive devices on a single semiconductor substrate, utilizing both sides of the substrate with trench isolation and bulk dielectric layers to form active and passive regions, and interconnect structures for efficient component coupling, reducing size and complexity while enhancing signal quality and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate chips are used in system-in-package configuration, then functional integration is achieved, but device size increases and manufacturing complexity increases
Solution Approach 1:
The patent merges multiple previously separate chips (RF power amplifier, low noise amplifier, voltage controlled oscillator, filters, and passive devices) onto a single silicon substrate. This consolidation eliminates the need for system-in-package configuration with multiple chips, thereby reducing overall device size while maintaining full functional integration. The merged architecture allows all RF front-end components to coexist on one chip, directly addressing the contradiction between functional integration and device size.
Solution Approach 2:
The single silicon substrate is designed to perform multiple functions simultaneously, hosting various active devices (amplifiers, oscillators) and passive devices (filters, inductors, capacitors) that were previously distributed across separate chips. This multi-functional substrate approach enables the system to achieve the functionality of multiple specialized components while occupying the space of a single integrated chip, thus resolving the size-integration contradiction.
2Adaptability or versatility
If multiple separate chips are used in system-in-package configuration, then functional integration is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
By combining multiple discrete chips into a single integrated silicon substrate, the patent eliminates complex inter-chip interconnection processes, wire bonding, and multiple packaging steps. The manufacturing process is simplified to a single semiconductor fabrication sequence that produces all RF front-end components on one chip, dramatically reducing manufacturing complexity and associated costs while preserving full functional integration.
Solution Approach 2:
The patent employs segmentation through trench isolation structures that divide the single silicon substrate into distinct functional regions for different devices and passive components. This segmentation allows independent optimization and fabrication of each component type within the unified substrate, simplifying the overall manufacturing process compared to handling multiple separate chips while maintaining functional modularity.
3Reliability
If conventional trench isolation is used, then device isolation is achieved, but substrate thickness variation and manufacturing difficulty increase
Solution Approach 1:
The patent introduces a horizontal isolation layer that extends laterally across the substrate at a specific depth, creating a planar isolation barrier. This horizontal dimension approach to isolation complements the conventional vertical trench isolation, providing effective device separation while maintaining uniform substrate thickness. The horizontal layer prevents signal leakage and interference between adjacent devices without requiring deep or varied trench depths, thus simplifying manufacturing.
Solution Approach 2:
The patent applies local quality by forming the horizontal isolation layer at specific depths and locations where isolation is most needed, rather than uniformly throughout the entire substrate. This targeted approach provides effective device isolation in critical regions while maintaining easier substrate processing in other areas, resolving the contradiction between isolation effectiveness and manufacturing ease.
Data Source
AI summary
An integrated circuit includes a first semiconductor substrate having a first surface and a second surface opposite to the first surface, at least one first trench extending into the first semiconductor substrate from the first surface and having a first depth, at least one second trench extending into the first semiconductor substrate from the first surface and having a second depth greater than the first depth, a thinned semiconductor region with a first recessed region extending in the first semiconductor substrate from the second surface and having a first thickness, a second recessed region in the first semiconductor substrate extending from the second surface to the first surface, and a bulk dielectric layer covering the second surface of the first semiconductor substrate.