RFIC Heat Sink for Thermal Management
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Solution Overview
Problem
RF CMOS switches on silicon-on-insulator substrates face overheating issues due to electrical coupling with the silicon substrate, leading to reduced reliability, especially under high signal power conditions, as removing the silicon substrate compromises heat dissipation capabilities.
Innovation Solution
A novel RFIC device is fabricated with a thin first semiconductor layer and dielectric layers to minimize parasitic effects, and an external heat sink with high thermal conductivity is used to dissipate heat from the semiconductor component, maintaining heat dissipation capabilities similar to the removed silicon substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the silicon substrate is removed during fabrication of RF CMOS switches, then electrical coupling between the top silicon thin-film and the silicon substrate is eliminated, but heat dissipation capability is reduced leading to overheating
Solution Approach 1:
The patent extracts only the necessary function of the silicon substrate (heat dissipation) while removing its harmful effect (electrical coupling). A heat sink structure is introduced to provide the heat dissipation function without the electrical coupling problem, effectively separating the thermal management function from the electrical substrate.
Solution Approach 2:
The patent introduces an intermediary heat sink structure between the RF CMOS switch and the external environment. This heat sink acts as a mediator that conducts heat away from the device without creating electrical coupling, fulfilling the thermal management role without the harmful electrical effects of a traditional silicon substrate.
2Temperature
If a heat sink is added to improve heat dissipation, then temperature control is improved, but device complexity increases
Solution Approach 1:
The heat sink is implemented as a thin-film structure deposited on the backside of the RF CMOS switch. This thin-film approach provides effective heat dissipation while minimizing the addition of bulk material and structural complexity, maintaining compatibility with standard semiconductor fabrication processes.
Solution Approach 2:
The heat sink structure is designed to serve multiple functions: it provides heat dissipation, acts as a mechanical support layer, and can be integrated with existing fabrication processes. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
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
The solution effectively reduces overheating and enhances the reliability of RFIC devices by efficiently dissipating heat without introducing additional electrical or parasitic effects, ensuring performance under high signal power conditions.
Implementation Method 1
a sheet-like heat sink formed on a surface of the second dielectric layer opposite to the first semiconductor layer and configured to dissipate heat from the semiconductor component
Data Source
AI summary
A radio frequency integrated circuit (RFIC) device and a method for fabricating same are disclosed. The RFIC device includes: a first semiconductor layer having a first surface, a second surface and a thickness of smaller than 3 μm; a first dielectric layer on the first surface of the first semiconductor layer; a semiconductor component within the first semiconductor layer and the first dielectric layer; a second dielectric layer on the second surface of the first semiconductor layer, the second dielectric layer having a thickness of smaller than 1 μm; and a sheet-like heat sink that is formed on the surface of the second dielectric layer opposite to the first semiconductor layer for dissipating heat from the semiconductor component. Efficient dissipation of heat from an RF transistor to a certain extent can be achieved by the RFIC device.