MOS Transistor Source Drain Region Joule Heating
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Solution Overview
Problem
Current heating systems for MOS transistors in cold environments are complex and do not efficiently increase the ambient temperature without modifying the active zone or functionality of the integrated circuit.
Innovation Solution
An electronic device with heating means electrically coupled to the source or drain regions of an MOS transistor, causing a current to circulate between two or three points to increase temperature via Joule's effect, with optional current pulses and control mechanisms to manage heating and prevent electro-migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If complicated heating systems are used to increase the ambient temperature of the MOS transistor, then the transistor performance in cold environments is improved, but the device complexity increases
Solution Approach 1:
The patent merges the heating function with the existing source/drain regions of the MOS transistor. The source or drain region is electrically coupled to heating means that cause current to circulate through them, transforming these standard transistor components into dual-purpose elements that both conduct current for transistor operation and generate heat for temperature control, thereby eliminating the need for separate heating systems
Solution Approach 2:
The source or drain region is given multiple functions: it serves as both the standard current-conducting element required for MOS transistor operation and as a heating element that generates heat through current circulation. This multi-functionality resolves the contradiction by using existing components for dual purposes rather than adding dedicated heating infrastructure
2Temperature
If current is circulated through the source or drain region to heat the transistor, then heating efficiency is improved, but the risk of electro-migration phenomenon increases
Solution Approach 1:
The patent employs periodic or pulsed current circulation through the source or drain region rather than continuous current. The heating means are configured to cause current to circulate in the form of current pulses, which provides sufficient heat generation during the pulse duration while reducing the average current exposure and thereby mitigating the risk of electro-migration damage to the transistor structure
Solution Approach 2:
The patent changes the temporal parameters of current application by using pulsed current instead of continuous current. By controlling the duty cycle, pulse width, and amplitude of the current pulses, the system achieves effective heating during the pulse while limiting the total charge transfer that causes electro-migration, thus resolving the contradiction between heating efficiency and reliability
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
Efficient heating of the MOS transistor active zone without altering its functionality, with controlled current pulses reducing the risk of electro-migration and allowing for uniform temperature distribution, enhancing performance in low-voltage applications.
Implementation Method 1
The circulation of this current will, by Joule's effect, increase the temperature of the active zone between said points and this heat will then be propagated in the active zone.
Data Source
AI summary
An electronic device includes an integrated circuit with a MOS transistor and a heating circuit electrically coupled to at least two points of one of the source or drain semiconductive region of the transistor. A portion of the source or drain semiconductive region between the two points forms a resistive element. The heating circuit is configured to cause a current to circulate through the resistive element between the two points to heat an active region of the transistor.