BiMOS Transistor ESD Protection Circuit
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Solution Overview
Problem
Existing electrostatic discharge protection circuits in electronic circuits lack high performance, especially as component sizes decrease, necessitating improved protection mechanisms to ensure reliability and durability.
Innovation Solution
A BiMOS-type transistor with specific doped regions and configurations, including heavily-doped P-type channel contact regions and a unique H-shaped channel and gate structure, is used to form an electrostatic discharge protection circuit within a SOI or FDSOI structure, allowing for efficient filtering of both positive and negative electrostatic discharges without additional resistors, thereby enhancing protection and reducing component size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electrostatic discharge protection circuits are used, then basic protection is provided, but performance is insufficient and component size increases
Solution Approach 1:
The patent combines multiple protection functions (positive ESD protection, negative ESD protection, and normal transistor operation) into a single BiMOS transistor structure. The bipolar junction provides ESD protection while the MOS channel provides normal operation, eliminating the need for separate protection components and reducing overall circuit size.
Solution Approach 2:
The BiMOS transistor structure performs multiple functions simultaneously: it operates as a normal transistor during normal operation and provides both positive and negative electrostatic discharge protection during ESD events. This multi-functionality eliminates the need for additional dedicated protection components.
2Reliability
If additional protection components (resistors, diodes) are added, then protection performance improves, but device complexity increases
Solution Approach 1:
The patent merges the ESD protection function with the transistor structure itself. The bipolar junction (forming a parasitic BJT) provides ESD protection while the MOS channel provides normal operation, eliminating the need for separate resistors and diodes that would increase device complexity.
Solution Approach 2:
The transistor structure provides its own ESD protection through the bipolar junction formed within the device. The heavy doping in the source and drain regions creates parasitic bipolar transistors that automatically activate during ESD events, eliminating the need for external protection components.
3Volume of moving object
If component size is reduced, then integration density improves, but electrostatic discharge protection becomes insufficient
Solution Approach 1:
The patent combines ESD protection functionality directly into the transistor structure, allowing protection to scale with device size. The bipolar junction provides ESD protection proportional to the device dimensions, maintaining effective protection as devices are scaled down for higher integration density.
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 BiMOS-type transistor effectively filters electrostatic discharges, providing enhanced protection and compactness by distributing internal resistance along the gate region, allowing for adjustable trigger voltages and eliminating the need for additional diodes, thus improving the performance and reliability of electronic circuits.
Implementation Method 1
distributing internal resistance along the gate region
Implementation Method 2
effectively filters electrostatic discharges
Implementation Method 3
The first and second channel contact regions are very heavily-doped P-type regions
Implementation Method 4
The first and second channel contact regions are P-type doped regions in contact with a channel region
Data Source
AI summary
A BiMOS-type transistor includes a gate region, a channel under the gate region, a first channel contact region and a second channel contact region. The first channel contact region is electrically coupled to the gate region to receive a first potential. The second channel contact region is electrically coupled to receive a second potential.