Emitter Finger Spacing for Thermal Uniformity
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Solution Overview
Problem
Current chip packaging methods fail to adequately address heat transfer needs, particularly in high-frequency and high-power applications, leading to inefficient heat dissipation and temperature uniformity issues in semiconductor devices like bipolar junction transistors.
Innovation Solution
The method involves forming a chip package with a thermal pathway structure that influences heat energy transport, where the dimensions and spacings of emitter fingers are optimized based on their proximity to heat sinks, heat sources, and thermal insulation, allowing for improved thermal management and temperature uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform emitter finger spacing is used across the chip, then manufacturing is simplified, but temperature uniformity deteriorates due to varying proximity to heat sinks
Solution Approach 1:
The patent applies local quality by varying the spacing between emitter fingers based on their specific location relative to heat sinks. Emitter fingers closer to heat sinks have different spacing compared to those farther away, creating non-uniform local spacing patterns that compensate for thermal gradients and achieve uniform temperature distribution across the chip surface.
Solution Approach 2:
The patent changes the spacing parameter of emitter fingers from a uniform value to location-dependent values. By adjusting the spacing parameter based on proximity to heat sinks, the design optimizes heat dissipation efficiency at different locations while maintaining overall temperature uniformity across the chip.
2Loss of energy
If emitter fingers are placed closer to heat sinks, then heat dissipation efficiency improves, but temperature uniformity deteriorates due to localized cooling
Solution Approach 1:
The patent implements local quality by tailoring the spacing of individual emitter fingers according to their specific thermal environment. Emitter fingers near heat sinks are spaced differently than those in cooler regions, ensuring that each location contributes appropriately to overall heat dissipation while maintaining temperature uniformity across the chip.
Solution Approach 2:
The patent modifies the spacing parameter of emitter fingers as a function of their distance from heat sinks. This parameter change allows closer spacing near heat sinks for enhanced heat removal while maintaining appropriate spacing in other regions, thereby achieving both efficient heat dissipation and temperature uniformity.
3Temperature
If non-uniform emitter finger spacing is implemented, then temperature uniformity improves, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by implementing location-specific spacing patterns for emitter fingers. Each region of the chip has optimized spacing based on its thermal characteristics, with closer spacing near heat sinks and adjusted spacing in other areas, achieving temperature uniformity through localized optimization rather than uniform design.
Solution Approach 2:
The patent introduces parameter changes in the spacing of emitter fingers based on their positional coordinates relative to heat sinks. This systematic parameter variation creates a controlled non-uniform pattern that improves temperature uniformity while maintaining manufacturability through a predictable, location-based design rule.
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 enhances heat dissipation efficiency and achieves a more uniform temperature profile across the chip package, reducing the occurrence of hotspots and improving the overall thermal management of semiconductor devices.
Implementation Method 1
A thermal pathway structure is formed that is configured to influence transport of heat energy emitted from the first emitter finger and the second emitter finger
Data Source
AI summary
Chip packages and methods of forming a chip package. The chip package includes a power amplifier and a thermal pathway structure configured to influence transport of heat energy. The power amplifier includes a first emitter finger and a second emitter finger having at least one parameter that is selected based upon proximity to the thermal pathway structure.