Semiconductor Alignment Pads for Probe Positioning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor device pads become smaller, aligning probes with them becomes increasingly difficult due to alignment errors, affecting the reliability of the test process.
Innovation Solution
Incorporating alignment pads electrically connected to signal pads, which are used to determine alignment errors between probes and signal pads, allowing for three-dimensional alignment and improved contact precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pad size is decreased to increase integration density, then device functionality is improved, but alignment precision between probes and pads deteriorates
Solution Approach 1:
The patent introduces alignment pads as intermediary elements between the probes and signal pads. These alignment pads serve as mediators that facilitate precise positioning by providing a dedicated alignment interface, thereby resolving the alignment precision issue without compromising integration density.
Solution Approach 2:
The patent segments the pad structure into two distinct functional components: signal pads for electrical connection and alignment pads for positioning. This segmentation allows each component to be optimized independently - signal pads maintain small size for high integration density while alignment pads provide sufficient area for accurate probe alignment.
2Manufacturing precision
If alignment pads are added to improve probe alignment, then alignment precision is improved, but device structure becomes more complex
Solution Approach 1:
The patent merges the alignment pads and signal pads into a single integrated pad structure formed through the same manufacturing processes. Both pad types are created using identical interconnection lines and insulating layers, thereby improving alignment precision without significantly increasing overall device complexity.
Solution Approach 2:
The alignment pads serve multiple functions: they provide alignment references for probe positioning, maintain electrical connectivity through interconnection lines, and are formed using the same manufacturing processes as signal pads. This multi-functionality reduces the need for separate structures and minimizes added complexity.
Data Source
AI summary
Provided is a semiconductor device including a substrate, insulating layers on the substrate, interconnection lines in or between the insulating layers, and pads on the insulating layers. The pads may include signal pads connected to the interconnection lines, and measurement pads disposed spaced apart from the signal pads and electrically connected to corresponding ones of the signal pads by the interconnection lines. Misalignment of probes contacting the semiconductor device may be detected by detecting a signal communicated between one or more of the measurement pads and the signal pads.