Multi-source JFET Device with Segmented Source Terminals
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Solution Overview
Problem
Conventional junction gate field-effect transistors (JFETs) with a single fixed source region limit current control and require multiple devices for higher current applications, making them inconvenient and necessitating the fabrication of new structures with varying characteristics.
Innovation Solution
A multi-source JFET device with two or more source terminals, where the source region is configured to provide multiple current paths, allowing for adjustable current supply by connecting different source terminals, and featuring a well region with varying dopant concentrations and silicide layers to enhance control and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single fixed source region is used in conventional JFET, then the device structure is simple, but current control capability is limited and multiple devices are required for higher current applications
Solution Approach 1:
The source region is segmented into multiple source terminals (first source terminal, second source terminal, third source terminal, etc.) within a single JFET device. Each source terminal can be independently connected to provide different current paths, enabling flexible current control without requiring multiple separate devices. This segmentation allows the device to adapt to different current requirements while maintaining a unified structure.
Solution Approach 2:
The single JFET device with multiple source terminals serves multiple functions: it can provide different current levels by selecting different source terminals, replace multiple separate JFET devices, and accommodate various current control requirements within one device. This multi-functionality resolves the contradiction by making one device capable of performing what previously required multiple devices.
2Power
If multiple single-source FETs are connected to achieve larger current amount, then current supply capability is improved, but device complexity and fabrication burden increase
Solution Approach 1:
Multiple source terminals are merged into a single JFET device structure, combining what would have been separate devices into one unified device. The multiple source terminals share common gate and drain regions, creating an integrated structure that provides the current supply capability of multiple devices while eliminating the need to fabricate and connect separate devices externally.
Solution Approach 2:
Instead of increasing current capability by connecting devices in parallel (external dimension), the invention integrates multiple source terminals within the internal structure of a single device. This dimensional transition from external connection to internal integration achieves the same current supply capability while reducing fabrication complexity.
3Ease of operation
If source terminals are isolated with doped regions, then current path control is improved, but manufacturing complexity increases
Solution Approach 1:
The source terminal isolating portions are formed using the same doping process that creates the source terminals themselves. The isolating portions are doped with opposite polarity automatically during the standard JFET fabrication sequence, allowing current path control to be achieved without additional specialized manufacturing steps. The structure isolates current paths while being created through conventional manufacturing processes.
Data Source
AI summary
A junction field-effect transistor (JFET) device is provided. The JFET includes a drain region, a source region, and a junction gate region disposed between the drain region and the source region, and the source region includes two or more source terminals.