Transient Voltage Suppressor With Heavily-Doped Trigger Region
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Solution Overview
Problem
Conventional transient voltage suppressors have complex structures and high resistance due to current concentration in a single path, making them inefficient in handling electrostatic discharge events effectively.
Innovation Solution
A transient voltage suppressor design featuring a substrate with multiple wells and electrodes, a doped region, and a heavily-doped region, allowing for multiple current paths to reduce overall resistance and simplify the structure by eliminating the gate electrode, with the heavily-doped region acting as a trigger to adjust breakdown voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a gate structure is used to control turn-on voltage in conventional transient voltage suppressors, then the turn-on voltage can be controlled, but the structure becomes complicated
Solution Approach 1:
The patent removes the gate structure from the transient voltage suppressor design. Instead of using a separate gate electrode to control turn-on voltage, the invention uses a heavily-doped region directly in the current path that triggers breakdown at a specific voltage threshold, thereby eliminating the gate structure while maintaining voltage control capability
Solution Approach 2:
The patent combines the voltage control function previously performed by the gate structure into the heavily-doped region. The heavily-doped region serves dual purposes: it provides the trigger mechanism for breakdown and integrates the voltage control function, merging what were previously separate components into a unified structure
2Device complexity
If current flows through a single current path in conventional transient voltage suppressors, then the structure is simpler, but the overall resistance is difficult to reduce
Solution Approach 1:
The patent segments the current path into multiple parallel paths by introducing a heavily-doped region that creates additional conduction channels. When breakdown occurs, current can flow through multiple paths including through the heavily-doped region, effectively reducing the overall resistance without significantly increasing structural complexity
Solution Approach 2:
The patent adds a vertical dimension to the current flow by introducing a heavily-doped region that extends into the substrate. This creates a three-dimensional current distribution with multiple conduction paths at different depths, reducing overall resistance by utilizing the vertical dimension rather than only horizontal expansion
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 design effectively reduces overall resistance and simplifies the structure, enabling efficient electrostatic discharge protection by distributing current through multiple paths and allowing for adjustable trigger voltage through doping concentration adjustments.
Implementation Method 1
The heavily-doped region has the same electrical property with the doped region and has higher doping concentration than the doped region
Implementation Method 2
when the forward voltage +V reaches a breakdown voltage VBR, the transient voltage suppressor will be turned on
Implementation Method 3
When an electrostatic discharge event occurs, the current in the conventional transient voltage suppressor is concentrated in the same current path causing the overall resistance of the transient voltage suppressor to be difficult to reduce
Data Source
AI summary
A transient voltage suppressor includes a substrate, a first well, a second well, a first electrode, a second electrode, a doped region and a heavily-doped region. The first well is formed in the substrate and near a surface of substrate. The second well is formed in the first well and near the surface. The first electrode and second electrode are formed in the second well and near the surface respectively. The first well and first electrode have a first electrical property. The second well and second electrode have a second electrical property. The doped region is formed between the first electrode and second electrode and near the surface and electrically connected with the first well and second well. The heavily-doped region is formed under the doped region. The heavily-doped region has the same electrical property with the doped region and has higher doping concentration than the doped region.