Semiconductor Shield Line Layout for Parasitic Coupling Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As the integration density of semiconductor devices increases, they often suffer from deterioration in electrical performance and reduced reliability.
Innovation Solution
The semiconductor device includes a substrate with transistors, a bit line structure, a channel layer, a gate structure, conductive lines, and shield lines. The shield lines are electrically separated from the conductive lines and bit line structure, which helps in reducing parasitic capacitance and improving shielding effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the integration density of semiconductor devices is increased, then the quantity of components per unit area is improved, but the electrical performance deteriorates due to increased parasitic capacitance and coupling between conductive lines
Solution Approach 1:
The patent introduces shield lines as intermediary elements positioned between adjacent conductive lines. These shield lines act as mediators that redirect electric field lines, thereby reducing the direct coupling and parasitic capacitance between neighboring signal lines. The shield lines are electrically connected to ground potential, creating an intermediate reference potential that isolates adjacent signal lines from each other while maintaining signal integrity.
Solution Approach 2:
The patent extracts the harmful electric field coupling between adjacent conductive lines by introducing dedicated shield lines that capture and redirect these fields to ground. By separating the signal-carrying function from the field-containing function into distinct structural elements (signal lines versus shield lines), the patent removes the source of parasitic capacitance while preserving the necessary electrical connections for high-density integration.
2Device complexity
If more conductive lines are placed closer together to increase integration, then the device complexity is reduced, but the coupling between conductive lines increases causing signal interference
Solution Approach 1:
The shield lines serve as intermediary structures that are strategically positioned between adjacent conductive lines carrying signals. These intermediaries redirect the electric field lines that would otherwise couple directly between signal lines, effectively reducing crosstalk and signal interference. The shield lines are connected to ground, providing a safe path for electric field termination without interfering with signal integrity.
Solution Approach 2:
The patent addresses the two-dimensional layout challenge by introducing a vertical dimension through multi-layer shielding structures. Shield lines are positioned in different vertical layers relative to conductive lines, creating three-dimensional field management. This dimensional approach allows closer horizontal spacing of conductive lines while maintaining electrical isolation through vertical separation and grounding.
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 configuration enhances the electrical characteristics and integration density of semiconductor devices, leading to improved performance and reliability by reducing coupling between conductive lines and enhancing the shielding effect.
Implementation Method 1
The shield lines are electrically separated from the first conductive line and the bit line structure... reducing parasitic capacitance and improving shielding effects
Implementation Method 2
upper shield line overlapping the first conductive line, and side shield lines spaced apart from each other with the first conductive line interposed therebetween... enhancing the shielding effect
Data Source
AI summary
A semiconductor device includes a substrate, a transistor on the substrate, a bit line structure electrically connected to the transistor, a channel layer on the bit line structure, a gate structure intersecting the bit line structure, a first conductive line electrically connecting the transistor and the bit line structure, an upper shield line overlapping the first conductive line, and side shield lines spaced apart from each other with the first conductive line interposed therebetween. The upper shield line and the side shield lines are electrically separated from the first conductive line and the bit line structure.