Integrated ESD Structure With Parallel Discharge Paths
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Integrated circuits are vulnerable to damage from electrostatic discharge (ESD) events due to high voltage and current pulses, necessitating effective ESD protection devices to prevent damage to internal core circuits.
Innovation Solution
The integration of diodes and transistors with specific configurations, such as P-type and N-type transistors, and optimized layouts of active areas and N-wells, enhances ESD protection by reducing resistance and increasing the width of ESD paths, thereby improving ESD current discharge efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection devices are used, then ESD protection is provided, but the ESD path resistance is high and discharge efficiency is low
Solution Approach 1:
The ESD protection device is segmented into multiple parallel ESD paths, each containing series-connected transistors (e.g., first transistor and second transistor in parallel configuration). This segmentation allows ESD current to be distributed across multiple paths, reducing the resistance of each individual path and improving overall discharge efficiency while maintaining reliable protection.
2Productivity
If ESD protection area is increased, then ESD current discharge efficiency is improved, but the area occupied by ESD protection device increases
Solution Approach 1:
Multiple ESD paths are merged into a parallel configuration within a compact layout. The first and second transistors in parallel, along with shared active areas and N-wells, create multiple discharge paths without proportionally increasing the total device area. This merging approach achieves high discharge efficiency while minimizing the area occupied by the ESD protection device.
Solution Approach 2:
The patent utilizes vertical stacking and three-dimensional integration of transistor layers to create multiple ESD paths within a reduced planar footprint. By extending ESD protection into the vertical dimension with multiple transistor layers and stacked active areas, the design achieves high discharge efficiency without proportionally increasing the horizontal area occupied by the device.
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 proposed solution significantly reduces ESD path resistance, increases ESD current discharge efficiency, and minimizes the area required for ESD protection, leading to improved performance and cost-effectiveness of integrated circuits.
Implementation Method 1
An electrostatic discharge (ESD) event produces extremely high voltages and leads to pulses of high current of a short duration that can damage integrated circuit devices.
Implementation Method 2
The first transistor and the second transistor are configured in parallel to provide multiple electrostatic discharge (ESD) paths for discharging ESD current between the input/output pad and the first supply voltage terminal.
Data Source
AI summary
An integrated circuit includes a first active area of a first conductivity type being coupled to an input/output (I/O) pad; a second active area of a second conductivity type, different from the first conductivity type, being coupled to a first supply voltage terminal; a plurality of first gate structures extending in a first direction to pass through the first and second active areas; and a first well of the second conductivity type extending along the first direction. The first and second active areas extend along a second direction different from the first direction in the first well, and the first active area is aligned with the second active area along the first direction.