Resistor Heat Dissipation via Intermediate Metal Nodes
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Solution Overview
Problem
Conventional heat dissipation techniques for resistors in integrated circuits (ICs) are inadequate, leading to electromigration issues due to non-uniform thermal distribution, with the resistor's center area forming a hot spot and becoming a critical failure point, especially as IC geometry decreases.
Innovation Solution
Incorporating intermediate metal nodes between the end metal nodes of resistors for enhanced heat dissipation, either directly on the resistor's surface or indirectly through a dielectric layer, to act as heat sinks, thereby reducing the temperature at the resistor's center and minimizing parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional edge contacts are used for heat dissipation, then temperatures at resistor edges are reduced, but the resistor center remains as a hot spot and EM critical area
Solution Approach 1:
The patent divides the heat dissipation function into multiple segments by introducing intermediate contacts in addition to edge contacts. These intermediate contacts are positioned at specific locations (e.g., center or off-center) along the resistor, creating multiple heat dissipation zones that segment the thermal path and eliminate the central hot spot.
Solution Approach 2:
The patent introduces intermediate contacts as intermediary elements between the resistor and the substrate. These intermediate contacts serve as thermal mediators that conduct heat away from the resistor center region, complementing the edge contacts and creating a more uniform temperature distribution.
2Quantity of substance
If resistor length and current are increased, then resistance value is improved, but center temperature becomes higher and EM risk increases
Solution Approach 1:
By segmenting the thermal dissipation path through intermediate contacts, the patent enables longer resistors to maintain lower center temperatures. The intermediate contacts create additional thermal escape routes that prevent heat accumulation in the center, allowing increased resistance values without proportional temperature increases.
3Temperature
If intermediate metal nodes are added for heat dissipation, then temperature distribution is flattened, but device complexity increases
Solution Approach 1:
The intermediate contacts serve multiple functions: they act as heat dissipation paths, serve as electrical connection points, and can be integrated with existing circuit elements. This multi-functionality reduces the net increase in device complexity while achieving improved temperature distribution.
Solution Approach 2:
The patent applies intermediate contacts selectively at specific locations rather than uniformly across the entire resistor. This localized approach optimizes heat dissipation where most needed (at the center or off-center regions) while minimizing the overall increase in device complexity.
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 approach effectively reduces the overall temperature and flattens the temperature distribution across the resistor, mitigating electromigration risks and maintaining electrical performance while managing parasitic capacitance.
Implementation Method 1
the intermediate metal node can thermally couple the resistor to a ground plane or a power plane in the device for heat dissipation of the resistor
Implementation Method 2
A resistor under operation in an IC generates heat and increases temperature of the IC, which is known as Joule heating
Data Source
AI summary
A semiconductor device is disclosed. In one example, the semiconductor device includes: an electronic component having a top surface, a bottom surface, and two end portions; a plurality of contacts disposed on the top surface; and a plurality of metal nodes disposed on the plurality of contacts. The plurality of contacts includes two end contacts disposed at the two end portions respectively and at least one intermediate contact disposed between the two end contacts. The plurality of metal nodes includes two end metal nodes disposed on the two end contacts respectively and at least one intermediate metal node disposed on the at least one intermediate contact.