Semiconductor Source Pad Layout for Uniform MOS Measurements
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Solution Overview
Problem
Existing semiconductor structures face variations in electrical performance due to differing routing distances from source regions of MOS devices to the source pad, leading to inconsistent measurements.
Innovation Solution
A semiconductor structure design with symmetrically arranged source and drain pads, ensuring equal distances from each source region to the respective pads, and employing a neighbor pad concept to enhance electrical performance accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple MOS devices share one single source pad to optimize pad utilization, then pad utilization is improved, but electrical performance consistency deteriorates due to varying routing distances
Solution Approach 1:
The patent divides the single source pad into multiple separate source pads, with each MOS device having its own dedicated source pad. This segmentation eliminates the varying routing distance issue while maintaining pad utilization efficiency through optimized layout design.
Solution Approach 2:
The patent implements local optimization by positioning source pads at specific locations relative to each MOS device, ensuring that each device has a source pad at an optimal distance. This creates locally consistent electrical characteristics while maintaining overall layout efficiency.
2Quantity of substance
If MOS devices are placed in different positions, then device density is improved, but electrical performance varies due to different routing lengths
Solution Approach 1:
The patent ensures that each MOS device position has a source pad optimized for that specific location, creating local electrical performance consistency. This allows high device density while maintaining uniform electrical characteristics across all devices.
Solution Approach 2:
The patent designs source pads to be positioned at substantially equal distances from source regions, creating equipotential conditions for electrical measurements. This eliminates position-dependent performance variations while maintaining high device density.
3Adaptability or versatility
If routing distances from source regions to source pad vary, then layout flexibility is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent positions source pads at substantially equal distances from source regions of MOS devices, creating equipotential conditions that eliminate routing distance effects on measurements. This maintains layout flexibility while ensuring measurement accuracy.
Solution Approach 2:
The patent optimizes the distance parameter between source pads and source regions, setting it to a specific value that minimizes routing resistance effects. This parameter optimization maintains layout flexibility while improving measurement accuracy.
Data Source
AI summary
A semiconductor structure comprises a substrate, a first transistor, a second transistor, a third transistor, a fourth transistor, a first source pad, and a second source pad. The first transistor and the second transistor are arranged along a first track of a first direction over the substrate. The first source pad is between the first and second transistors along the first track of the first direction and electrically connected with source regions of the first and second transistors. The third transistor and fourth transistor is arranged along a second track of the first direction over the substrate, and the second track of the first direction is parallel to and non-overlapped the first track of the first direction. The second source pad is between the third and fourth transistors along the second direction and electrically connected with source regions of the third and fourth transistors.