O-Shaped Semiconductor Gate Layout for Low-Noise Multiple-Vt Circuits
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Solution Overview
Problem
The challenge of manufacturing multiple-Vt circuits with different voltage requirements in integrated circuits, particularly in analog circuits, is complicated by carrier trapping at the interface between the gate and isolation, leading to noise issues.
Innovation Solution
A semiconductor structure is designed with an O-shaped gate structure separated from the isolation by O-shaped doped and lightly-doped regions, forming an overlaying region to prevent carrier trapping and reduce noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the gate structure is placed close to the isolation to reduce device area, then device density is improved, but carrier trapping occurs at the interface leading to noise issues
Solution Approach 1:
The patent introduces an intermediate doped region between the gate structure and the isolation structure. This intermediate region acts as a mediator that prevents direct contact between the gate and isolation, thereby eliminating carrier trapping at the interface while maintaining compact device dimensions. The doped region serves as a buffer zone that resolves the conflict between area reduction and noise prevention.
2Adaptability or versatility
If multiple-Vt circuits with different voltage requirements are manufactured, then circuit functionality is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by introducing specific doped regions with different doping concentrations and types in different areas of the device. These localized doped regions enable different threshold voltages in different parts of the circuit while using a unified manufacturing process. The local modification of electrical properties through doping allows multiple-Vt functionality without increasing overall manufacturing complexity.
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
This design effectively mitigates carrier trapping and noise issues in analog circuits by ensuring the O-shaped gate structure is entirely separated from the isolation, improving process practicality and flexibility.
Implementation Method 1
carrier trapping at the interface between the gate and isolation, leading to noise issues
Data Source
AI summary
A semiconductor structure includes a first doped region disposed in a substrate, an O-shaped second doped region disposed in the substrate, an O-shaped gate structure disposed over the substrate, an O-shaped first isolation disposed between the O-shaped gate structure and the substrate, a first lightly-doped region in the substrate, and an O-shaped second lightly-doped region in the substrate. The O-shaped second doped region encircles the first doped region. The O-shaped gate structure is disposed between the first doped region and the O-shaped second doped region. The first lightly-doped region is disposed under the first doped region, and the O-shaped second lightly-doped region is disposed under the O-shaped second doped region. The O-shaped gate structure, the O-shaped first isolation, and the O-shaped second lightly-doped region overlap each other to form a first overlaying region.