Junction-less Current Limiter Trench Structure
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Solution Overview
Problem
Current protection devices for integrated circuits are inadequate in responding to various undesirable power conditions such as current in-rush and surges, leading to potential damage from overvoltage and overcurrent conditions, necessitating a more effective power protection system.
Innovation Solution
A junction-less current limiter with a trench structure in a semiconductor substrate, featuring a dielectric and electrode configuration that limits current in response to voltage differences, providing fast and thermally self-balanced protection without the need for junctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional protection devices are used, then basic overvoltage protection is provided, but they cannot respond to various undesirable power conditions such as current in-rush and surges
Solution Approach 1:
The current limiter device is designed to provide multiple protection functions simultaneously - it can handle overvoltage conditions, overcurrent conditions, current in-rush, and current surges through a single unified structure. The junction-less design with trench electrode configuration enables the device to respond to various power anomalies without requiring separate protection components for each condition type.
2Adaptability or versatility
If protection device coverage is expanded to handle multiple power conditions, then versatility improves, but device complexity increases
Solution Approach 1:
The device employs a segmented trench structure divided into multiple regions (first region, second region, third region) with different doping concentrations. This segmentation allows each region to contribute differently to the overall protection function - the first region handles overvoltage, the second region manages current limiting, and the third region provides additional protection - while maintaining a unified integrated structure that does not increase overall device complexity.
Solution Approach 2:
A single junction-less current limiter device performs multiple protection functions that would traditionally require separate components. The unified structure with strategically doped regions provides overvoltage protection, overcurrent protection, in-rush current limitation, and surge protection without requiring multiple discrete devices or complex circuitry.
3Speed
If response speed is increased for fast protection, then protection effectiveness improves, but thermal management becomes more challenging
Solution Approach 1:
Different regions of the device have different doping concentrations optimized for their specific functions. The first region has a first doping concentration for overvoltage protection, the second region has a second doping concentration for current limiting with fast response, and the third region has a third doping concentration for additional protection. This local quality variation allows fast response in critical regions while distributing thermal load across the entire structure.
Solution Approach 2:
The device provides thermally self-balanced protection through its junction-less structure and distributed doping configuration. The multiple regions with different doping concentrations create inherent thermal management characteristics that allow the device to maintain stability under varying thermal conditions while providing fast protection response when needed.
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 limits current and voltage spikes, protecting integrated circuits and associated components by rapidly transitioning to a current-limiting state, maintaining functionality across varying temperatures and reducing the risk of damage from power surges.
Implementation Method 1
a dielectric disposed within the trench, and an electrode disposed within the dielectric and insulated from the semiconductor substrate by the dielectric
Implementation Method 2
The semiconductor substrate can have a portion aligned vertically and adjacent the trench, and the portion of the semiconductor substrate can have a conductivity type that is continuous along an entirety of the depth of the trench
Data Source
AI summary
In one general aspect, an apparatus can include a semiconductor substrate, and a trench defined within the semiconductor substrate and having a depth aligned along a vertical axis, a length aligned along a longitudinal axis, and a width aligned along a horizontal axis. The apparatus includes a dielectric disposed within the trench, and an electrode disposed within the dielectric and insulated from the semiconductor substrate by the dielectric. The semiconductor substrate can have a portion aligned vertically and adjacent the trench, and the portion of the semiconductor substrate can have a conductivity type that is continuous along an entirety of the depth of the trench. The apparatus is biased to a normally-on state.