Mirror-Symmetric Multi-Bit IC Layout for Compact ESD Protection
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Solution Overview
Problem
The increasing complexity and power dissipation in semiconductor integrated circuits (ICs) due to scaling down processes necessitate improved manufacturing and processing techniques, particularly in protecting functional transistors from electrostatic discharge (ESD) events.
Innovation Solution
A stacked integrated circuit (IC) design with mirror-symmetric bit arrangements and ESD protection circuits, including diodes and power-clamp circuits, to efficiently protect logic circuits from ESD events while minimizing circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If scaling down process is used to increase functional density, then production efficiency and cost are improved, but power dissipation increases
Solution Approach 1:
The patent combines multiple ESD protection functions into a single integrated circuit device, merging the ESD protection circuit with the logic circuit in a unified structure. This integration reduces the overall area required for protection circuits while maintaining protection effectiveness against ESD events, thereby addressing the power dissipation issue associated with scaling down.
Solution Approach 2:
The integrated circuit device performs multiple functions simultaneously: it provides ESD protection for the logic circuit while also implementing the logic function itself. The device structure allows it to serve both as a protective element and a functional element, reducing the need for separate protection components that would increase area and power consumption.
2Reliability
If ESD protection circuits are added to protect functional transistors, then reliability is improved, but device area increases
Solution Approach 1:
The ESD protection circuit is merged with the logic circuit in a single integrated structure sharing common substrates, wells, and doping regions. This consolidation eliminates the need for separate protection circuit blocks, significantly reducing the area required for ESD protection while maintaining reliable protection functionality.
Solution Approach 2:
The ESD protection circuit is nested within the logic circuit structure, with protection elements embedded alongside functional transistors. The shared substrate and well structures allow the protection circuit to be contained within the same physical footprint as the logic circuit, minimizing area overhead.
3Productivity
If mirror-symmetric bit arrangement is used in stacked IC design, then integration density is improved, but manufacturing complexity increases
Solution Approach 1:
While the overall bit arrangement follows a mirror-symmetric pattern for density optimization, the patent introduces asymmetric variations in the ESD protection circuit implementation. Specifically, the protection circuits use different doping configurations and well structures that are optimized for their specific functional requirements, allowing manufacturing processes to handle the complexity through standardized asymmetric building blocks.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The proposed design effectively reduces the area required for ESD protection circuits, enhancing the integration density and efficiency of ICs by safeguarding functional transistors against ESD, thus addressing power dissipation challenges.
Implementation Method 1
protect logic circuits from ESD events
Implementation Method 2
power-clamp circuits, to efficiently protect logic circuits from ESD events
Data Source
AI summary
An integrated circuit device includes a semiconductor substrate, a plurality of multi-bit cells over the semiconductor substrate, a first pad, and a second pad. Each of the multi-bit cells includes first and second bits. The first bit includes a first electrostatic discharge (ESD) protection circuit and a first strap region in the semiconductor substrate. The second bit includes a second ESD protection circuit and a second strap region in the semiconductor substrate. The first strap region of the first bit is symmetric to the second strap region of the second bit with respect to a border between the first bit and the second bit in a top view, and the first p-type strap region of the first bit and the second strap region of the second bit have a first conductivity type. The first and second pads are respectively connected to the first and second ESD protection circuits.