Integrated Circuit Tap Cell Placement for Latch-Up Prevention
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Solution Overview
Problem
Existing electronic design automation (EDA) tools struggle to accurately determine optimal tap cell placements in integrated circuits to prevent latchup, leading to inefficiencies such as area waste, timing degradation, and potential latchup susceptibility due to inconsistent tap-to-tap distances and densities.
Innovation Solution
A method for determining latchup susceptibility in standard place and route blocks, using tap cells with adjustable configurations and placements based on voltage droop analysis, and iterative adjustments to optimize tap cell distribution and placement to minimize latchup risk while reducing area overhead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If tap cells are added to prevent latchup, then reliability is improved, but area consumption increases
Solution Approach 1:
The patent applies local quality by determining latchup susceptibility at specific locations within the integrated circuit design and selectively placing tap cells only in those susceptible areas. The system analyzes the circuit layout to identify regions with high latchup risk based on transistor density and junction configurations, then inserts tap cells precisely in those locations rather than uniformly across the entire design, thereby preventing latchup only where needed and minimizing unnecessary area consumption.
Solution Approach 2:
The patent implements preliminary action by performing latchup susceptibility analysis during the design stage before fabrication. The system evaluates the circuit design, identifies potential latchup locations, and determines optimal tap cell placements in advance. This preliminary determination allows for optimized tap cell distribution that prevents latchup while minimizing area overhead, rather than adding excessive tap cells as a conservative measure.
2Reliability
If tap cells are densely distributed to prevent latchup, then reliability is improved, but timing performance deteriorates
Solution Approach 1:
The patent applies local quality by concentrating tap cells in regions with high latchup susceptibility while leaving low-risk areas without tap cells. The system evaluates latchup risk based on local circuit characteristics such as transistor density, junction proximity, and well configurations, then places tap cells selectively in those specific high-risk zones. This localized approach prevents latchup where needed without introducing timing degradation in low-risk areas where tap cells would be unnecessary.
3Ease of manufacture
If uniform tap cell placement is used, then manufacturing simplicity is improved, but latchup prevention effectiveness deteriorates
Solution Approach 1:
The patent implements preliminary action by performing automated latchup susceptibility analysis during the design stage to determine optimal tap cell placements before fabrication. The system evaluates the circuit layout, identifies high-risk locations based on transistor density and junction configurations, and calculates optimal tap cell positions in advance. This preliminary determination provides a data-driven placement strategy that is more effective than uniform placement while still being implementable through automated design tools.
Solution Approach 2:
The patent applies feedback by using latchup susceptibility analysis results to guide tap cell placement decisions. The system analyzes the circuit design, identifies areas with high latchup risk, and uses this feedback information to determine where tap cells should be placed. This feedback-driven approach ensures tap cells are positioned where they will be most effective at preventing latchup, rather than using a blind uniform distribution strategy.
Data Source
AI summary
An integrated circuit design method includes receiving an integrated circuit design, and determining a floor plan for the integrated circuit design. The floor plan includes an arrangement of a plurality of functional cells and a plurality of tap cells. Potential latchup locations in the floor plan are determined, and the arrangement of at least one of the functional cells or the tap cells is modified based on the determined potential latchup locations.