Poly Resistor Segmentation for ESD Heat Dissipation
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Solution Overview
Problem
Semiconductor chip circuit poly resistors are prone to damage from overheating during Electro-Static Discharge (ESD) due to their limited heat capacity and small size, restricting the layout of the resistor circuit.
Innovation Solution
A poly resistor is divided into small parts connected to an upper-part metal layer through Contacts and Vias, utilizing metal aluminum for increased heat capacity and reducing the overall circuit size by distributing the metal area effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the poly resistor area is increased to absorb heat during ESD, then the resistor damage resistance is improved, but the overall circuit size increases
Solution Approach 1:
The poly resistor is divided into N small parts (N≥2), with each part connected to an upper-part metal layer through a Contact and Via. This segmentation distributes the heat absorption function across multiple smaller units, allowing the total heat capacity to be achieved without requiring a single large resistor area.
Solution Approach 2:
The invention combines poly resistor material with metal aluminum material (or aluminum alloy) in a composite structure. The metal layers provide additional heat capacity and heat dissipation pathways, enhancing the resistor's ability to withstand ESD events while maintaining a compact footprint.
2Reliability
If the poly resistor area is increased to prevent overheating during ESD, then the heat capacity is improved, but the layout flexibility is reduced
Solution Approach 1:
By dividing the poly resistor into N small parts, the design achieves sufficient heat capacity through distributed thermal mass rather than a single large area. This segmentation enables flexible layout arrangements where multiple small units can be positioned to meet both thermal and routing requirements.
Solution Approach 2:
The invention utilizes the vertical dimension by connecting poly resistor parts to an upper-part metal layer through Contacts and Vias. This three-dimensional arrangement allows heat capacity to be achieved in the vertical direction, freeing up planar layout space and improving design flexibility.
3Reliability
If a single large poly resistor is used to withstand ESD current, then the heat absorption capability is improved, but the manufacturing complexity increases
Solution Approach 1:
The poly resistor is segmented into N standard-sized parts, each with uniform dimensions and connection structures. This standardization simplifies manufacturing processes compared to fabricating a single large non-uniform resistor, as the segmented parts can be produced using常规 fabrication steps and then connected through standard Contact and Via processes.
Solution Approach 2:
The upper-part metal layer serves multiple functions: it provides additional heat capacity, acts as a heat dissipation path, and serves as an electrical connection layer. This multi-functionality reduces the need for separate dedicated structures, thereby simplifying the overall device complexity while maintaining heat absorption capability.
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
This solution prevents resistor damage during ESD events by enhancing heat dissipation and significantly reducing the overall size of the ESD device circuit while maintaining proper resistance and heat capacity.
Implementation Method 1
a heat capacity characteristic of metal aluminum is utilized... metals on the same equipotential line are connected together and on the equipotential lines of the resistor at intervals
Implementation Method 2
A metal aluminum material is adopted for the Via and the upper-part metal layer... heat dissipation
Implementation Method 3
prevent the resistor from being damaged when ESD occurs... heat dissipation
Data Source
AI summary
Provided is a resistor structure of a series resistor of an Electro-Static Discharge (ESD) device. A poly resistor is divided into N small parts, and each small part is connected to an upper-part metal layer through a respectively corresponding Contact and Via. The Contact and Via corresponding to each small part and the connected upper-part metal layer form an independent unit. A metal aluminum material is adopted for the Via and the upper-part metal layer. The metal aluminum material or an aluminum alloy material is adopted for the Contact. A heat capacity characteristic of metal aluminum is utilized, and an existing structure is ingeniously utilized, so that the resistor may be prevented from being damaged by heating caused by the same ESD current, and meanwhile, an overall size of a circuit where the ESD device is located is greatly reduced.