Concentric Triac ESD Protection Reducing Parasitic Capacitance
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Solution Overview
Problem
Conventional ESD protection methods for electronic modules, such as using MOS power transistors and diodes, result in significant surface area occupation and parasitic capacitance, which negatively impact signal integrity and are inefficient in absorbing electrostatic discharge pulses.
Innovation Solution
An integrated electronic component with a scalable, compact topology featuring concentric annular semiconductor triac structures, reducing surface area and parasitic capacitance, and capable of effectively absorbing large ESD pulses by adjusting the number of triac structures and supplementary conductive elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional diodes are used for ESD protection, then the protection function is provided, but the surface area occupation is considerable
Solution Approach 1:
The protection device is divided into multiple triac structures (first triac structure and second triac structure) that can be arranged in a compact concentric configuration. Each triac structure provides independent protection capability, allowing the system to maintain reliable ESD protection while reducing the overall surface area through efficient spatial arrangement.
Solution Approach 2:
The triac structures are arranged in a nested concentric configuration where the first triac structure and second triac structure are positioned one within or around the other, sharing common regions and boundaries. This nesting approach maximizes space utilization and significantly reduces the total surface area occupation compared to conventional separate diode arrangements.
2Reliability
If conventional diodes are used for ESD protection, then the protection function is provided, but the parasitic capacitances are considerable
Solution Approach 1:
The protection function is segmented across multiple triac structures rather than using single large diodes. This segmentation reduces the parasitic capacitance of each individual structure, and the distributed configuration prevents the accumulation of large total parasitic capacitance that would degrade signal integrity.
Solution Approach 2:
The invention changes the fundamental device parameter from conventional diodes to triac structures, which have different electrical characteristics including lower parasitic capacitance. This parameter change enables the system to maintain ESD protection functionality while reducing the harmful parasitic capacitance effect on signal integrity.
3Reliability
If the number of triac structures is increased to absorb larger ESD pulses, then the ESD absorption capability is improved, but the surface area and parasitic capacitance increase
Solution Approach 1:
Multiple triac structures are arranged in a nested concentric configuration that allows them to share common regions, contacts, and support structures. This nesting enables the system to increase ESD absorption capability by adding more triac structures while minimizing the incremental surface area required, as each additional structure utilizes space more efficiently.
Solution Approach 2:
The concentric annular regions and common contacts serve multiple functions simultaneously - they form part of multiple triac structures, provide shared electrical connections, and contribute to ESD pulse absorption. This multi-functionality allows the system to achieve higher ESD absorption capability without linearly increasing surface area occupation.
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 component efficiently absorbs ESD pulses with reduced parasitic capacitance and surface area occupation, enhancing signal integrity and adaptability to various ESD pulse strengths, while maintaining compatibility with CMOS or BICMOS manufacturing methods.
Implementation Method 1
the component efficiently absorbs ESD pulses with reduced parasitic capacitance and surface area occupation
Implementation Method 2
absorb this current pulse and prevent excess voltages across the terminals of the module
Data Source
AI summary
The component incorporates, in topological terms, a scalable number of triac structures in a concentric annular arrangement. The component can be used with an electronic device to protect against electrostatic discharges. For example, the components can be used to protect the input/output pad, the first power supply terminal, and the second power supply terminal of an integrated circuit against electrostatic discharges.