Distributed ESD Protection Circuit With Shared Bridge Node Layout
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Solution Overview
Problem
Existing semiconductor devices require extensive area and increased parasitic impedance due to numerous ESD protection circuits, which are necessary for withstanding electrostatic discharge events while maintaining electrical isolation between pads, leading to higher costs and die size.
Innovation Solution
Implementing distributed ESD protection circuits using fewer ESD diodes, with a bridge node acting as a common connection for multiple ESD protection circuits, reducing the number of diodes by half or more and minimizing parasitic impedance, while maintaining effective ESD protection and electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD protection circuits are placed between every two adjacent pads, then ESD protection capability is improved, but semiconductor die area is increased
Solution Approach 1:
Multiple ESD protection circuits share a common connection node instead of being fully isolated. The patent shows that ESD protection circuits connected to adjacent pads can share a common node, merging previously separate circuits into a distributed network that provides protection while reducing redundant components and die area.
Solution Approach 2:
The ESD protection function is segmented into distributed circuits connected to individual pads, with each circuit providing localized protection. This segmentation allows the system to maintain overall ESD protection capability while using fewer total components compared to fully isolated circuits.
2Reliability
If ESD protection circuits are placed between every two adjacent pads, then ESD protection capability is improved, but parasitic impedance is increased
Solution Approach 1:
By merging multiple ESD protection circuits through shared common nodes, the patent reduces the total number of isolation elements and connection paths. This merging decreases the cumulative parasitic impedance while maintaining ESD protection capability across all pads.
3Reliability
If numerous ESD diodes are used in ESD protection circuits, then ESD protection capability is improved, but device complexity is increased
Solution Approach 1:
The patent merges ESD protection functions across multiple circuits by sharing common nodes and diodes. Instead of requiring separate diodes for each isolated circuit, the shared architecture allows multiple circuits to utilize the same diode components, significantly reducing the total diode count while maintaining protection capability.
4Reliability
If ESD protection circuits are placed between every two adjacent pads, then electrical isolation between pads is maintained, but semiconductor die area is increased
Solution Approach 1:
The patent segments the ESD protection function into distributed circuits that maintain electrical isolation between pads during normal operation. Each segmented circuit provides localized isolation while the overall distributed architecture reduces total area compared to fully isolated circuits.
Solution Approach 2:
By merging circuits through shared nodes, the patent achieves electrical isolation between pads without requiring separate isolated circuits for each pad pair. The shared architecture provides isolation functionality with reduced die area.
Data Source
AI summary
In a general aspect, a circuit includes a first ESD protection circuit having a first terminal and a second terminal, and a second ESD protection circuit having a first terminal and a second terminal. The second terminal of the second ESD protection circuit is coupled with the second terminal of the first ESD protection circuit. The circuit further includes a third ESD protection circuit having a first terminal and a second terminal. The second terminal of the third ESD protection circuit is coupled with the second terminal of the first ESD protection circuit and the second terminal of the second ESD protection circuit.