Rectangular Bump Thermal Isolation for Semiconductor Power Amplifiers
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Solution Overview
Problem
Existing semiconductor elements and power amplification devices face challenges in improving heat dissipation characteristics, which are crucial for enhancing performance and reliability, particularly in radio frequency power amplification modules where heat transfer between amplification units is a concern.
Innovation Solution
A semiconductor element and power amplification device design featuring a semiconductor substrate with adjacent first and second amplifiers, reference potential bumps, and a rectangular bump that is wider in one direction than the bumps, facilitating efficient heat dissipation by preventing heat transfer between amplifiers and allowing for effective thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If circular trap bumps are arranged with intervals between them to suppress electromagnetic coupling, then electromagnetic coupling is suppressed, but heat transfer occurs through the intervals between the bumps
Solution Approach 1:
The patent changes the bump shape from circular to rectangular with a specific aspect ratio (width in second direction larger than width in first direction). This asymmetric shape allows the bumps to be arranged in a way that they effectively block heat transfer paths between adjacent amplifiers while maintaining electromagnetic coupling suppression, resolving the contradiction between these two requirements.
Solution Approach 2:
The rectangular bumps are strategically positioned and dimensioned to create different thermal blocking characteristics in different directions. The bumps have larger width in the second direction to specifically block heat transfer between amplifiers arranged in the first direction, while maintaining appropriate spacing for electromagnetic isolation. This local optimization of bump geometry addresses the heat transfer issue without compromising electromagnetic coupling suppression.
2Power
If multiple power amplifiers are provided in a semiconductor chip, then power amplification capability is improved, but heat dissipation becomes more difficult
Solution Approach 1:
The patent uses rectangular reference potential bumps as thermal isolation structures between adjacent power amplifiers. These bumps segment the thermal pathways, preventing heat from one amplifier from transferring to adjacent amplifiers. This segmentation allows multiple high-power amplifiers to be packed closely on the chip while maintaining effective heat dissipation for each individual amplifier unit.
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 design significantly improves heat dissipation characteristics, as demonstrated by increased temperature drops and efficient heat transfer paths, thereby enhancing the performance and reliability of the semiconductor element and power amplification device.
Implementation Method 1
a rectangular bump provided on the main surface of the semiconductor substrate, provided between the first reference potential bump and the second reference potential bump in a plan view from a direction perpendicular to the main surface, and formed such that a second width in a second direction orthogonal to the first direction is larger than a first width in the first direction. The second width of the rectangular bump is larger than a width of at least one of the first reference potential bump and the second reference potential bump in the second direction
Data Source
AI summary
A semiconductor element includes a semiconductor substrate, first and second amplifiers provided on the semiconductor substrate and adjacently provided in a first direction, a first reference potential bump provided on a main surface of the semiconductor substrate, and connecting the first amplifier and a reference potential, a second reference potential bump provided on the main surface, being adjacent to the first reference potential bump in the first direction, and connecting the second amplifier and a reference potential, and a rectangular bump provided on the main surface, provided between the first and second reference potential bumps in a plan view, and formed such that a second width in a second direction orthogonal to the first direction is larger than a first width in the first direction. The second width is larger than a width of at least one of the first and second reference potential bumps in the second direction.