Single Well Current Dissipation Circuit for Reverse Voltage Protection
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Solution Overview
Problem
Current dissipation circuits, such as SCRs, often require dual well technology and may not effectively manage current during reverse voltage conditions, potentially leading to electrical overstress and damage in semiconductor circuitry.
Innovation Solution
A current dissipation circuit using single well technology with alternating p-type and n-type regions in a series connection, allowing for adjustable current dissipation and protection during abnormal voltage conditions, including reverse voltage scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual well technology is used for current dissipation circuits, then current protection capability is improved, but device complexity and processing steps increase
Solution Approach 1:
The patent extracts the p-type well from the traditional dual-well SCR structure, retaining only the n-type well and substrate to form a simplified current dissipation circuit. This extraction maintains the essential current protection function while eliminating the complexity of dual-well processing, directly resolving the contradiction between protection capability and device complexity.
Solution Approach 2:
The patent modifies the structural parameters of the SCR by changing from a dual-well configuration to a single-well configuration. This parameter change alters the fabrication process requirements and reduces processing steps while preserving the voltage-triggered current dissipation mechanism, thereby resolving the contradiction between reliability and complexity.
2Reliability
If conventional SCR technology is used, then current dissipation function is provided, but adaptability to reverse voltage conditions is lost
Solution Approach 1:
The patent inverts the traditional SCR structure by removing the p-type well and utilizing only the n-type well and substrate. This inversion creates a structure that is inherently adaptable to reverse voltage conditions while maintaining the current dissipation function through the remaining n-type regions and substrate interaction, resolving the contradiction between protection function and voltage adaptability.
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 dissipates excess current away from protected circuitry, preventing electrical overstress and enabling operation in reverse voltage conditions, while simplifying the fabrication process by using single well technology.
Implementation Method 1
A current dissipation circuit using single well technology with alternating p-type and n-type regions in a series connection, allowing for adjustable current dissipation and protection during abnormal voltage conditions
Implementation Method 2
When the monitored circuit node exceeds the normal operating voltage range, the SCR draws or provides current as appropriate to thereby prevent excessive currents from being experienced within the protected circuitry
Data Source
AI summary
A current dissipation circuit that dissipates excess current to or from a circuit node when that monitored circuit node experiences abnormal voltage conditions, rather than having that excess current being dissipated through other protected circuitry. The current dissipation circuit may use single well technology, and may even provide reverse voltage protection without necessarily triggering more significant current dissipation. In another embodiment, the current dissipation circuit is provided by a series connection of at least five alternating p-type and n-type regions provided between the monitored circuit node and a current source or sink.