Chip ESD Protection Network for Multi-Power Pad Discharge
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Solution Overview
Problem
Integrated circuits are vulnerable to damage from electrostatic discharge due to the lack of effective protection mechanisms, which can lead to failure or burning, especially when internal circuits connected to power supply pads with lower terminal voltages have weaker breakdown resistance.
Innovation Solution
An electrostatic discharge protection network for a chip is implemented, comprising multiple ESD protection circuits between power supply pads and a ground pad, including drive units, discharge transistors, and diodes, which provide discharge paths and control signals to manage electrostatic charges based on voltage differences between power supply pads, enhancing protection capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple ESD protection circuits are added between power supply pads and ground pad, then the ESD protection capability is improved, but the device complexity increases
Solution Approach 1:
The ESD protection network is segmented into multiple independent protection circuits, each responsible for specific power supply pads. This segmentation allows targeted protection where needed while maintaining modularity, resolving the contradiction by organizing complexity into manageable segments rather than a monolithic structure.
Solution Approach 2:
Different ESD protection circuits are configured with different characteristics suited to their specific power supply pad requirements. Power supply pads with lower terminal voltages receive enhanced protection configurations, while higher voltage pads use standard protection, optimizing the overall system without uniformly increasing complexity everywhere.
2Reliability
If ESD protection circuits are added to all power supply pads, then the protection coverage is improved, but the manufacturing cost increases
Solution Approach 1:
The patent implements differentiated protection strategies based on local requirements of each power supply pad. Circuits connected to power supply pads with lower terminal voltages are equipped with enhanced ESD protection, while pads with higher voltages use standard protection levels, optimizing manufacturing cost while ensuring adequate protection coverage.
Solution Approach 2:
The ESD protection circuits are designed to automatically activate and operate without external control, detecting electrostatic discharge conditions and responding independently. This self-service capability reduces the need for additional control circuitry and simplifies manufacturing while maintaining comprehensive protection.
3Reliability
If ESD protection circuits with higher breakdown resistance are used, then the protection capability for low-voltage circuits is improved, but the device complexity increases
Solution Approach 1:
The patent applies enhanced breakdown resistance characteristics specifically to ESD protection circuits associated with power supply pads that have lower terminal voltages. Higher voltage pads use standard protection circuits, creating a localized enhancement strategy that improves vulnerability points without unnecessarily complicating the entire system.
Solution Approach 2:
The ESD protection circuits are configured with adjustable parameters including breakdown voltage thresholds and discharge characteristics. By changing these parameters based on the specific voltage requirements of each power supply pad, the system achieves optimized protection without requiring fundamentally different circuit topologies, thus avoiding excessive complexity.
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 solution effectively discharges electrostatic charges to the ground, improving the reliability and capability of ESD protection, particularly for power supply pads with lower voltages, by providing multiple discharge paths and simplifying the network structure, thus preventing damage from electrostatic discharges.
Implementation Method 1
configured to discharge an electrostatic charge when there is an electrostatic discharge pulse caused by the electrostatic charge on the first power supply pad
Implementation Method 2
provide a discharge path for an electrostatic charge between the first power supply pad and the second power supply pad
Data Source
AI summary
The present disclosure provides an electrostatic discharge (ESD) protection network for a chip. The chip includes a first power supply pad, a second power supply pad, and a ground pad. The ESD protection network includes: a first ESD protection circuit, located between the first power supply pad and the ground pad, and configured to discharge an electrostatic charge when there is an ESD pulse caused by the electrostatic charge on the first power supply pad; a second ESD protection circuit, located between the second power supply pad and the ground pad, and configured to discharge an electrostatic charge when there is an ESD pulse caused by the electrostatic charge on the second power supply pad; and a third ESD protection circuit, configured to provide a discharge path for an electrostatic charge between the first power supply pad and the second power supply pad.