Electrically Isolated Thermal Conduit for IC Resistor Heat Management
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Solution Overview
Problem
Resistors in integrated circuits face challenges in reducing area while maintaining reliability due to joule heating and electromigration, with existing heat removal methods adding capacitive loads or increasing costs.
Innovation Solution
An integrated circuit design featuring an electrically isolated thermal conduit with interconnect lines thermally coupled to a gate structure, which conducts heat away from the resistor without adding capacitive loads, reducing temperature rise by 30-60% and maintaining process latitude.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If thermal sinks are formed from the resistor to the substrate, then heat removal is improved, but capacitive load increases significantly
Solution Approach 1:
The patent introduces an electrically isolated thermal conduit as an intermediary structure that conducts heat away from the resistor to a heat sink region without creating electrical capacitance. The thermal conduit is electrically isolated from the resistor through a first dielectric layer and from the substrate through a second dielectric layer, allowing thermal energy transfer while blocking electrical coupling that would create capacitive load.
2Temperature
If conventional heat removal schemes are used, then temperature control is improved, but fabrication complexity increases
Solution Approach 1:
The thermal conduit structure serves multiple functions simultaneously: it acts as a thermal pathway for heat removal, provides electrical isolation through integrated dielectric layers, and connects to heat sink regions without requiring separate fabrication processes. The conduit is formed using standard semiconductor fabrication techniques that are already present in the manufacturing flow, eliminating the need for additional specialized process steps.
3Area of stationary object
If resistor area is reduced to save space, then area efficiency is improved, but reliability decreases due to joule heating and electromigration
Solution Approach 1:
The patent extracts the heat removal function from the traditional substrate path and creates a dedicated thermal conduit structure that specifically targets heat extraction from the resistor. This allows the resistor to be miniimized in area for space efficiency while the extracted heat is actively removed through the conduit to heat sink regions, preventing the temperature rise that would cause electromigration and reliability failures.
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 resistor temperature and maintains process latitude, addressing the limitations of existing heat removal methods while minimizing capacitive loading and fabrication complexity.
Implementation Method 1
The interconnect lines of the electrically isolated thermal conduit are thermally coupled through vertical interconnects to a gate structure located on a dielectric material over the semiconductor material of the substrate
Implementation Method 2
Limits to reducing the resistor area are frequently encountered due to temperature increases in the resistor by joule heating during operation of the integrated circuit
Data Source
AI summary
An integrated circuit has a substrate including semiconductor material and a resistor in an interconnect region, above a first level of interconnect lines. The integrated circuit further includes an electrically isolated thermal conduit having one or more interconnect lines in every interconnect level lower than the resistor. The interconnect lines of the thermal conduit are directly connected through one or more vertical interconnects, including contacts, and possibly vias, to a gate structure located on a dielectric material over the semiconductor material of the substrate. The thermal conduit is electrically isolated from the resistor, from all active components in the integrated circuit, and from the semiconductor material of the substrate.