MOS Gate Protection Diode Layout for Compact ESD Robustness
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Solution Overview
Problem
The miniaturization of integrated circuit (IC) devices makes them more susceptible to electrostatic discharge (ESD) damage, requiring ESD protection circuits with larger dimensions and layout areas to achieve robustness beyond 2 kV in human-body-model ESD stress.
Innovation Solution
A semiconductor device design incorporating a metal-oxide semiconductor (MOS) transistor with a pickup region and a protection diode of different conductive types, electrically connected to the gate structure, to enhance ESD protection without increasing the total layout area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If devices with large dimensions are designed into the on-chip ESD protection circuit, then ESD robustness is improved, but total layout area increases
Solution Approach 1:
The invention introduces a non-uniform doping concentration distribution within the ESD protection device. The doping concentration varies in different regions (e.g., higher near the gate, lower towards the contact), creating locally optimized electrical properties that enhance breakdown voltage and ESD robustness without requiring a larger overall device area.
Solution Approach 2:
The invention modifies key electrical parameters including doping concentration, junction depth, and device geometry to optimize ESD performance. By carefully controlling these parameters, particularly the doping profile, the device achieves higher breakdown voltage and improved ESD robustness while maintaining a compact footprint suitable for modern scaled technologies.
2Length of moving object
If shallower junction depths and thinner gate oxides are used, then device miniaturization is achieved, but susceptibility to ESD damage increases
Solution Approach 1:
The invention incorporates preliminary protective structures and doping profiles designed specifically to counteract ESD damage before it occurs. The optimized doping concentration distribution and device geometry create inherent protection mechanisms that preemptively resist ESD stress, allowing shallow junctions to maintain ESD robustness despite their reduced dimensions.
Solution Approach 2:
The invention employs composite doping structures with multiple regions of different doping types and concentrations within the same device. This composite approach creates a gradient structure that provides both the shallow junction depth needed for miniaturization and the enhanced ESD protection required to resist electrostatic discharge damage.
Data Source
AI summary
A semiconductor device includes a first metal-oxide semiconductor (MOS) transistor on a substrate, a pickup region adjacent to one side of the first MOS transistor, and a protection diode adjacent to another side of the first MOS transistor. Preferably, the first MOS transistor includes a first gate structure on the substrate and a first source/drain region adjacent to two sides of the first gate structure, the protection diode is electrically connected to the first gate structure, and the pickup region and the protection diode include different conductive type.