Oscillator Heat-Generating Transistor Layout for Compact IC Heating
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Solution Overview
Problem
The reduction in size of integrated circuit devices with heat generating circuits leads to deteriorated heat generation performance due to parasitic resistances in the source and drain regions of transistors, which limits the current flowing through the heat generating transistor and decreases the heat generation capacity.
Innovation Solution
The integrated circuit device incorporates a heat generating transistor with a gate voltage controlled by a temperature control signal, where the source resistance is made smaller than the drain resistance by varying the width of the source and drain regions, and the transistors are arranged in parallel to maintain heat generation performance while reducing the layout area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the size of the integrated circuit device is reduced, then the layout area is decreased, but the heat generation performance deteriorates due to increased parasitic resistance
Solution Approach 1:
The patent applies local quality by making the source region width larger than the drain region width. This creates an asymmetric structure where the source region has lower parasitic resistance compared to the drain region, locally optimizing the resistance distribution to maintain heat generation performance in a compact layout.
Solution Approach 2:
The patent employs asymmetry by designing the source region with a different width than the drain region. Specifically, the source region width is made larger to reduce source parasitic resistance, creating an asymmetric transistor structure that optimizes current flow and heat generation efficiency in the reduced-size device.
2Area of stationary object
If the transistor size is reduced to decrease device area, then the layout area decreases, but the current flow capability is reduced due to parasitic resistance
Solution Approach 1:
The patent applies local quality by selectively enlarging the source region width while keeping the drain region width smaller. This local modification reduces the parasitic resistance at the source terminal, improving current flow capability without increasing the overall device area.
Solution Approach 2:
The patent changes the geometric parameters of the transistor regions, specifically setting the source region width to be larger than the drain region width. This parameter change optimizes the resistance characteristics and current flow capability within the constrained device area.
3Power
If the source region width is increased to reduce source resistance, then the heat generation performance is maintained, but the layout area increases
Solution Approach 1:
The patent resolves this contradiction by creating an asymmetric structure where only the source region width is increased, not the entire transistor. The drain region maintains a smaller width, so the overall layout area increase is minimized while still achieving the goal of reducing source parasitic resistance and maintaining heat generation performance.
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 configuration effectively prevents a decrease in gate-source voltage and heat generation capacity, allowing for improved heat generation performance even as the size of the integrated circuit device is reduced, by ensuring the source resistance is less than 60% of the drain resistance, thus maintaining the heat generation capacity.
Implementation Method 1
an integrated circuit device including a heat generating circuit controlled based on a temperature control signal. The heat generating circuit includes a heat generating transistor including a plurality of transistors that have a gate voltage controlled based on the temperature control signal
Data Source
AI summary
An integrated circuit device includes a heat generating circuit controlled based on a temperature control signal. The heat generating circuit includes a heat generating transistor including a plurality of transistors that have a gate voltage controlled based on the temperature control signal and are coupled in parallel. A resistance value of a source resistance of the heat generating transistor is smaller than a resistance value of a drain resistance of the heat generating transistor.