Semiconductor Pad Layout for Noise Isolation
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Solution Overview
Problem
In semiconductor devices, noise from the sense amplifier ground potential (VSSSA) can propagate to adjacent signal pads, causing misinterpretation of signal levels due to parallel wiring configurations, leading to malfunction in memory devices.
Innovation Solution
The configuration of conductive lines connected to sense amplifier ground potential pads and adjacent signal pads is arranged such that the lines extend in opposite directions relative to the pad row, preventing noise propagation and ensuring accurate signal interpretation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the VSSSA pad is arranged next to the DQ pad to reduce chip area, then the area efficiency is improved, but noise propagates from the VSSSA wire to the DQ wire causing signal misinterpretation
Solution Approach 1:
The patent applies asymmetry by arranging the VSSSA pad and DQ pad in a non-symmetric configuration where the VSSSA pad is positioned at an end of the pad row rather than adjacent to the DQ pad. This asymmetric layout prevents the parallel wire configuration that causes noise coupling, while still maintaining compact chip area through optimized pad row design.
Solution Approach 2:
The patent resolves the contradiction by changing the spatial relationship between pads from a one-dimensional adjacent arrangement to a two-dimensional configuration where pads are separated along the pad row. This dimensional change in pad layout prevents noise propagation while maintaining area efficiency through proper pad row utilization.
2Adaptability or versatility
If pads are arranged closely together to increase I/O capacity, then the device functionality is improved, but noise interference between adjacent pads increases
Solution Approach 1:
The patent applies segmentation by dividing the pad row into distinct functional sections, placing VSSSA pads at ends and DQ pads in intermediate positions. This segmentation creates natural noise isolation zones, allowing high I/O capacity through dense pad arrangement while maintaining signal recognition accuracy through spatial separation of noise-sensitive and noise-generating pads.
Solution Approach 2:
The patent implements local quality by assigning different functional roles to different positions in the pad row: VSSSA pads at ends for ground potential stability, and DQ pads in intermediate positions for signal I/O. This localized functional differentiation enables high I/O capacity while ensuring reliable signal recognition by placing noise-sensitive pads in positions with better noise characteristics.
Data Source
AI summary
A semiconductor device includes a pad for sense amplifier ground potential as an electrode pad supplying ground potential voltage to a sense amplifier, a first conductive line connected to the pad for sense amplifier ground potential, and a second conductive line connected to an electrode pad closest to the pad for sense amplifier ground potential among plural electrode pads included in a pad row. The second conductive line extends to the opposite side of the first conductive line with the pad row as a reference.