ESD Protection Device with Adjustable Trigger Voltage
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Solution Overview
Problem
Electronic systems are vulnerable to transient electrical events like electrostatic discharge (ESD), which can cause overvoltage conditions leading to damage in integrated circuits due to high power dissipation, temperature increases, and latch-up, necessitating effective protection mechanisms.
Innovation Solution
The implementation of ESD protection devices with multiple protection circuits integrated into a common semiconductor substrate, including bipolar and silicon-controlled rectifier (SCR) configurations, with adjustable trigger voltages and holding voltages to manage ESD events across various voltage ranges, utilizing structures like trench side walls, buried layers, and diode arrays to distribute current and reduce temperature increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single protection circuit is used, then the device structure is simple, but it cannot provide protection across multiple voltage ranges
Solution Approach 1:
The patent implements multi-functionality by integrating multiple protection circuits (first protection circuit for first voltage range, second protection circuit for second voltage range) into a single ESD protection device. Each circuit is designed to handle specific voltage ranges, allowing the device to provide comprehensive protection across wide voltage variations without requiring separate protection devices for each range.
Solution Approach 2:
The patent divides the protection function into segmented voltage ranges by using different protection circuits for different voltage levels. The first protection circuit handles the first voltage range while the second protection circuit handles the second voltage range, allowing each circuit to be optimized for its specific range while collectively providing broad-spectrum protection.
2Adaptability or versatility
If protection circuits are added to cover multiple voltage ranges, then voltage range coverage is improved, but the area occupied on the semiconductor substrate increases
Solution Approach 1:
The patent merges multiple protection circuits into a single integrated ESD protection device on one semiconductor substrate. By combining the first protection circuit, second protection circuit, and their interconnections into a unified structure, the patent achieves multi-voltage-range protection while minimizing the total substrate area compared to using separate discrete protection devices.
Solution Approach 2:
The patent utilizes vertical integration and multi-layer substrate structures to accommodate multiple protection circuits in a compact footprint. By organizing circuits across different layers and using vertical interconnections, the patent reduces the lateral area occupied while maintaining full functionality of multiple voltage range protections.
3Reliability
If ESD protection is implemented, then IC protection from transient electrical events is improved, but the device complexity and manufacturing process difficulty increase
Solution Approach 1:
The ESD protection circuits are designed to automatically activate and protect the IC without requiring external control or complex manufacturing steps. The protection mechanism operates autonomously based on voltage thresholds and current conditions, simplifying the manufacturing process by eliminating the need for additional control circuitry or complex assembly steps while maintaining reliable protection.
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
These ESD protection devices effectively safeguard integrated circuits from ESD events by providing multi-range protection, reducing the risk of damage from overvoltage conditions and maintaining operational integrity across different voltage ranges.
Implementation Method 1
High power dissipation can increase IC temperature... The implementation of ESD protection devices with multiple protection circuits integrated into a common semiconductor substrate... utilizing structures like trench side walls, buried layers, and diode arrays to distribute current and reduce temperature increases
Data Source
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AI summary
An apparatus includes an electrostatic discharge (ESD) protection device. In one embodiment, the protection device electrically coupled between a first node and a second node of an internal circuit to be protected from transient electrical events. The protection device includes a bipolar device or a silicon-controlled rectifier (SCR). The bipolar device or SCR can have a modified structure or additional circuitry to have a selected holding voltage and/or trigger voltage to provide protection over the internal circuit. The additional circuitry can include one or more resistors, one or more diodes, and/or a timer circuit to adjust the trigger and/or holding voltages of the bipolar device or SCR to a desired level. The protection device can provide protection over a transient voltage that ranges, for example, from about 100 V to 330V.