Shared Well Layout for Latch-Up Protection With Fewer Pickups
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Solution Overview
Problem
The miniaturization of integrated circuits (ICs) has led to challenges in efficiently utilizing space while ensuring latch-up protection, as existing designs often require multiple pickup structures for each row of IC devices, limiting space utilization and increasing complexity.
Innovation Solution
The proposed IC structure incorporates a shared well configuration with fewer pickup structures, where a single pickup structure biases multiple portions of the well, allowing for increased space utilization and efficient latch-up protection by distributing biasing across more than two rows of IC devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pickup structures are used for each row of IC devices, then latch-up protection is ensured, but space utilization is limited and device complexity increases
Solution Approach 1:
Multiple separate well structures are merged into a single shared well that serves multiple rows of IC devices. This consolidation reduces the total number of pickup structures needed while maintaining latch-up protection across all served rows, directly resolving the contradiction between reliability and device complexity
Solution Approach 2:
The shared well structure is designed to perform multiple functions simultaneously - it provides latch-up protection for multiple rows of devices through a single unified structure, rather than requiring dedicated pickup structures for each row. This multi-functionality reduces overall complexity while preserving protective functionality
2Reliability
If multiple pickup structures are used for each row of IC devices, then latch-up protection is ensured, but space utilization is limited
Solution Approach 1:
By merging multiple individual well structures into one shared well, the total area occupied by pickup structures is reduced. This allows more effective use of the IC device space while maintaining comprehensive latch-up protection across multiple rows
Solution Approach 2:
The shared well structure extends in multiple spatial dimensions to serve multiple rows of devices, allowing a single pickup structure to provide protection across a larger area by utilizing dimensional extension rather than requiring multiple discrete structures
Data Source
AI summary
An integrated circuit (IC) structure includes a continuous well including first through third well portions. The continuous well is one of an n-well or a p-well, the first well portion extends in a first direction, the second well portion extends from the first well portion in a second direction perpendicular to the first direction, and the third well portion extends from the first well portion in the second direction parallel to the second well portion.