ESD Protection Circuit With Insulated Bipolar Transistors
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Solution Overview
Problem
Semiconductor integrated circuits are vulnerable to electrostatic discharge (ESD) due to increasing integration densities, which can cause physical damage from high voltage and current levels, necessitating effective ESD protection circuits.
Innovation Solution
An ESD protection circuit is designed incorporating a substrate with a semiconductor layer, wells, doped regions, and an insulating pattern, forming vertical and lateral bipolar transistors and a Zener diode to quickly discharge ESD pulses, with the Zener diode and bipolar transistors connected in a configuration that allows for efficient current discharge through multiple current paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If integration density of semiconductor devices is increased, then device functionality and capacity are improved, but vulnerability to ESD damage increases due to decreased voltage and current damage thresholds
Solution Approach 1:
The ESD protection circuit is segmented into multiple functional components: a first bipolar transistor for initial ESD current diversion, a second bipolar transistor for additional protection, and a Zener diode for voltage clamping. This segmentation allows each component to handle specific aspects of ESD protection, collectively providing comprehensive protection against high voltage and current while enabling continued high integration density in the core device.
2Reliability
If conventional ESD protection circuits are used, then basic ESD protection is provided, but the circuit complexity increases and occupies additional area
Solution Approach 1:
The ESD protection circuit merges multiple protection mechanisms into a unified structure. The first and second bipolar transistors are combined with a Zener diode in an integrated configuration where they share common electrical nodes and work cooperatively. This merging provides enhanced ESD protection capability while maintaining a compact structure that reduces overall circuit complexity compared to using separate protection circuits for each mechanism.
3Reliability
If ESD protection circuit is added to protect against high voltage and current, then device reliability is improved, but manufacturing process complexity increases
Solution Approach 1:
The bipolar transistors and Zener diode in the ESD protection circuit are designed with multi-functionality. The bipolar transistors serve both as ESD protection elements and can function as active devices in the semiconductor device. The Zener diode provides both voltage clamping for ESD protection and reference voltage functionality. This universality allows the same structures to serve multiple purposes, reducing the need for additional dedicated ESD protection structures and simplifying the overall manufacturing process.
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 reduces voltage applied to core circuit parts, preventing damage from ESD events by enabling quick discharge of ESD pulses, thereby protecting semiconductor devices from high voltage and current levels.
Implementation Method 1
When an ESD pulse is applied to a semiconductor device, the ESD protection circuit is generally configured to quickly discharge the ESD pulse to the outside of a semiconductor device
Data Source
AI summary
An electrostatic discharge (ESD) protection circuit includes a substrate, a semiconductor layer provided on the substrate to have a first conductivity type, a first well provided in a first region of the semiconductor layer to have a second conductivity type, an insulating pattern provided in the first well to cross the first well, and first and second doped regions provided in an upper portion of the first well to have the first conductivity type. The first and second doped regions may be laterally spaced apart from each other with the insulating pattern interposed therebetween.