Dynamic ESD Protection Device with Independent Parameter Control
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Solution Overview
Problem
Conventional ESD protection devices are limited in their ability to handle a wide range of voltages and currents in both positive and negative directions, requiring separate design for each voltage range, which is inflexible and inefficient for complex electronic circuits.
Innovation Solution
A semiconductor device with a dynamic region and interconnect region that allows independent control over breakdown voltage, critical voltage, and critical current, enabling operation as an SCR in both positive and negative directions, or as a simple diode in one direction, using varying implants and geometry adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD protection devices are designed for a specific voltage range, then they provide reliable protection for that range, but they require separate device designs for different voltage ranges
Solution Approach 1:
The patent implements a universal ESD protection device structure that can operate across multiple voltage ranges by configuring different transistor types (NPN/PNP) and their connectivity. The same basic device architecture can provide protection for different voltage levels by adjusting which transistors are active and how they are connected, eliminating the need for completely separate device designs for each voltage range.
Solution Approach 2:
The patent employs dynamic region parameters including variable doping levels, adjustable geometry dimensions, and configurable transistor connections that can be optimized for different voltage ranges. The device structure allows dynamic adjustment of breakdown voltages and critical currents through parameter variation while maintaining the same fundamental device architecture.
2Stability of the object's composition
If conventional ESD devices use fixed doping levels, then they provide stable breakdown voltage, but they cannot independently control breakdown voltage, critical voltage, and critical current
Solution Approach 1:
The patent utilizes variable doping levels in the dynamic region, adjustable transistor geometry parameters, and configurable connectivity options to independently control breakdown voltage, critical voltage, and critical current. By changing these parameters within the same device structure, the invention achieves both stable operation and flexible parameter control for different ESD protection requirements.
Solution Approach 2:
The patent applies different doping levels and geometry parameters to specific regions (NPN transistor region, PNP transistor region) within the device to achieve independent control of different parameters. Each region can be optimized with local parameter adjustments while maintaining overall device stability and functionality.
3Ease of operation
If SCR devices snap back in one direction only, then they provide simple diode operation in the other direction, but they cannot provide symmetric ESD protection in both positive and negative directions
Solution Approach 1:
The patent employs asymmetric configuration of NPN and PNP transistors where one transistor type provides snapback protection while the other operates as a simple diode, or both can be configured for symmetric bidirectional protection. This asymmetric design allows flexible configuration to achieve either unidirectional or bidirectional ESD protection depending on the application requirements.
Solution Approach 2:
The patent divides the ESD protection function into separate NPN and PNP transistor components, each capable of independent configuration. This segmentation allows one transistor to handle positive voltage ESD events while the other handles negative voltage ESD events, enabling symmetric bidirectional protection through coordinated operation of the segmented components.
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
Enables flexible ESD protection across a wide range of voltages and currents without significant redesign, meeting the needs of complex electronic circuits by independently controlling breakdown voltages and currents for both positive and negative voltage operations.
Implementation Method 1
In another embodiment, a P+ contact diffusion is replaced with a P+ Zener implant, providing a different breakdown voltage
Implementation Method 2
In a further embodiment, a Pwell region and a P+ contact diffusion is replaced with a P-type high voltage implant, providing a greater breakdown voltage
Data Source
AI summary
Electrostatic discharge (ESD) protection is provided for an integrated circuit. In an aspect, a dynamic region having doped regions is formed on an epitaxy layer and substrate, and interconnects contact the dynamic region. In an aspect, the dynamic region operates as a back-to-back SCR that snaps back in both positive and negative voltage directions. In an aspect the dynamic region operates as an SCR that snaps back in a positive voltage direction and operates as a simple diode in a negative voltage direction. In another aspect, the dynamic region operates as an SCR that snaps back in a negative voltage direction and operates as a simple diode in a positive voltage direction. ESD protection over an adjustable and wide positive and negative voltage range is provided by varying widths and positioning of various doping regions. Breakdown voltages, critical voltages and critical currents are independently controlled.