Integrated ESD Diode Structure for IC Pad Protection
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Solution Overview
Problem
Existing ESD protection networks in integrated circuits face challenges in efficiently preventing static electricity from flowing into internal circuits while minimizing power consumption and production costs, as they often require additional diodes that increase circuit size and cost.
Innovation Solution
An ESD protection diode is formed by contacting an N-type semiconductor of a first diode with a P-type semiconductor of a second diode, creating a third diode that allows static electricity to be diverted without additional components, thereby reducing parasitic resistances and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional diodes are added to the ESD protection network to improve static electricity protection, then the reliability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent merges two diodes into a single integrated structure where the first diode and second diode share a common substrate and are formed in an integrated manner. This combining approach provides dual ESD protection paths (through first diode to power supply line and through second diode to ground line) while using a unified device structure, thereby improving reliability without proportionally increasing device complexity and production cost
2Reliability
If additional diodes are added to the ESD protection network to improve static electricity protection, then the reliability is improved, but the production cost increases
Solution Approach 1:
The patent combines multiple ESD protection functions into a single integrated diode structure that can be manufactured as one unified component. This integration reduces the total number of discrete components needed, simplifies the manufacturing process, and lowers production costs while maintaining comprehensive ESD protection capability through multiple protection paths within the single device
3Reliability
If current passes through multiple ESD protection elements, then the protection coverage is improved, but the power consumption increases due to parasitic resistances
Solution Approach 1:
The patent segments the ESD protection function into two parallel paths: one through the first diode to the power supply line and another through the second diode to the ground line. This segmentation provides multiple protection coverage options while allowing current to choose the path of least resistance, thereby reducing overall power consumption compared to a single-series path configuration
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
This configuration enhances the endurance of the ESD protection network against static electricity without increasing the circuit area or production costs, as it effectively prevents static electricity from entering the internal circuit while reducing power consumption.
Implementation Method 1
an N-type semiconductor that constitutes a first diode and is connected to a pad for a power supply voltage; a P-type semiconductor that constitutes the first diode and is connected to a signal line; an N-type semiconductor that constitutes a second diode and is connected to the signal line; a P-type semiconductor that constitutes the second diode and is connected to a pad for grounding
Implementation Method 2
a third diode that is formed by contacting the N-type semiconductor of the first diode and the P-type semiconductor of the second diode
Data Source
AI summary
Provided is an electrostatic discharge (ESD) protection diode that is formed on an input/output pad of an integrated circuit (IC), the ESD protection diode including: an N-type semiconductor that constitutes a first diode and is connected to a pad for a power supply voltage; a P-type semiconductor that constitutes the first diode and is connected to a signal line; an N-type semiconductor that constitutes a second diode and is connected to the signal line; a P-type semiconductor that constitutes the second diode and is connected to a pad for grounding; and a third diode that is formed by contacting the N-type semiconductor of the first diode and the P-type semiconductor of the second diode.