Schottky Barrier RF Switch Transistors for Lower IMD3
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Solution Overview
Problem
Non-linearities in communication device circuitry cause harmonic and intermodulation distortion, making it difficult to maintain isolation between multiple signals, particularly third-order intermodulation distortion, which is challenging to filter out and creates interference in multichannel communication equipment.
Innovation Solution
Integrate Schottky barrier contacts into the drain and source of transistors within a radio-frequency switch, utilizing Silicon-on-Insulator (SOI) technology to minimize non-linearity effects, thereby reducing harmonic and intermodulation distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional transistors are used in radio-frequency switches, then the device can operate across multiple communication bands, but non-linearities cause third-order intermodulation distortion that creates signal interference
Solution Approach 1:
The patent integrates Schottky barrier diodes into the transistor structure to convert the harmful non-linear effects into beneficial linearizing effects. The Schottky diodes generate distortion products that cancel out the third-order intermodulation distortion produced by the transistor, transforming the harmful non-linearity into a useful linearization mechanism that enables clean multi-band operation
Solution Approach 2:
The patent creates a composite transistor structure by integrating Schottky barrier diodes with the transistor channels. This composite structure combines the switching capability of the transistor with the linearizing effect of the Schottky diodes, resulting in a unified device that maintains adaptability across communication bands while eliminating intermodulation distortion
2Object-generated harmful factors
If Schottky barrier contacts are integrated into transistors, then third-order intermodulation distortion is reduced, but device structure and fabrication process become more complex
Solution Approach 1:
The patent merges the Schottky barrier diode structure with the transistor fabrication process, integrating both functions into a single unified structure. The Schottky contacts are formed as part of the transistor metallization layers, eliminating the need for separate diode fabrication steps and reducing overall device complexity despite the enhanced functionality
Solution Approach 2:
The integrated Schottky barrier contacts serve multiple functions: they provide the standard transistor switching capability while simultaneously generating linearizing distortion products. This multi-functionality reduces the need for additional compensation circuits or separate linearization components, thereby managing device complexity
3Reliability
If Schottky barrier contacts are integrated into transistors, then signal isolation between multiple signals is improved, but manufacturing process steps increase
Solution Approach 1:
The patent combines the Schottky barrier diode fabrication with the transistor manufacturing sequence, forming both structures using the same metallization and thermal processing steps. This merged approach improves signal isolation through the integrated Schottky contacts while avoiding the need for additional separate fabrication process steps
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 integration of Schottky barrier contacts into transistors significantly reduces third-order intermodulation distortion, improving signal isolation and minimizing interference in multichannel communication devices.
Implementation Method 1
a first Schottky barrier contact (SBC) integrated into a drain of the transistor and a second Schottky barrier contact (SBC) integrated into a source of the transistor
Data Source
AI summary
Circuits, systems, devices, and methods related to transistors with Schottky barriers are discussed herein. For example, a method of fabricating a transistor can include forming a p-well or an n-well in a substrate and forming a gate for the transistor. The method can also include doping a region within the p-well or n-well with a concentration below a threshold and forming a conductor layer on the doped region.