Multi-Layer Stacked Waveguide Structure for Signal Integrity
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Solution Overview
Problem
The increasing complexity and miniaturization of semiconductor integrated circuits require smaller CPW structures with narrower ground lines to maintain signal integrity, but this poses challenges in layout design and circuit integrity due to the need for wider ground lines to avoid signal reduction.
Innovation Solution
A waveguide structure with a multi-layer stacked static line configuration, where each static line consists of three conductive patterns stacked on top of each other, allowing for reduced width without compromising signal transmission efficiency, formed through a specific manufacturing method involving trench formation and insulation layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the width of ground lines in CPW structure is increased to maintain signal integrity, then the electric field and signal magnitude are preserved, but the layout design flexibility and circuit integrity are reduced
Solution Approach 1:
The patent transitions from a two-dimensional planar ground line structure to a three-dimensional multi-layer stacked structure. By stacking multiple conductive patterns vertically, the effective ground line width is increased in the vertical dimension while maintaining a compact footprint in the horizontal plane, thus preserving signal integrity without compromising layout flexibility
Solution Approach 2:
The patent employs a composite structure consisting of multiple conductive patterns stacked together with dielectric layers in between. This composite configuration creates an equivalent ground line with increased effective width, maintaining electric field strength and signal integrity while occupying less horizontal space for improved layout design
2Reliability
If the width of ground lines in CPW structure is increased to avoid signal reduction, then the transmitted signal magnitude is maintained, but the area of the waveguide structure increases
Solution Approach 1:
The invention utilizes the vertical dimension by stacking multiple conductive patterns to increase the effective ground line width. This vertical stacking achieves the required signal magnitude through increased effective width without proportionally increasing the horizontal area, thus reducing the overall waveguide structure footprint
Solution Approach 2:
The patent implements a nested configuration where multiple conductive patterns are stacked vertically one on top of another, similar to nested dolls. This nesting approach consolidates multiple functional layers into a compact vertical arrangement, maintaining signal magnitude while minimizing the horizontal area occupied by the waveguide structure
3Reliability
If the width of ground lines in CPW structure is increased to maintain electric field, then the signal transmission efficiency is preserved, but the layout designs of other components are constrained
Solution Approach 1:
By moving to a three-dimensional stacked configuration, the patent increases the effective ground line width vertically, maintaining the required electric field strength for reliable signal transmission. This vertical expansion allows for more flexible horizontal layout arrangements of other circuit components, reducing overall layout design complexity
Data Source
AI summary
A waveguide structure includes a signal line and two static lines. The signal line is disposed between the static lines in a first direction. The static lines and the signal line are disposed parallel to one another. Each static line includes a first conductive pattern, a second conductive pattern, and a third conductive pattern. The first conductive pattern and the signal line are disposed on an identical plane of a dielectric layer. A thickness of the first conductive pattern is substantially equal to a thickness of the signal line. The second conductive pattern is disposed on the first conductive pattern. A width of the first conductive pattern is larger than a width of the second conductive pattern in the first direction. The third conductive pattern is disposed on the second conductive pattern. A width of the third conductive pattern is larger than the width of the second conductive pattern.