Power Amplifier Module Layout With Through-Substrate Heat Dissipation
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Solution Overview
Problem
As wireless communication systems evolve, there is a growing need for higher power amplifiers while simultaneously reducing the amplifier footprint, which poses significant thermal challenges.
Innovation Solution
The implementation of multiple-stage power amplifier modules with embedded heat dissipation structures that extend through the module substrate, allowing for compact designs capable of operating at high power levels while managing thermal issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power amplifier modules are designed to operate at higher power levels, then power output is improved, but thermal management difficulty worsens
Solution Approach 1:
The patent implements heat dissipation structures that extend vertically through the module substrate in the third dimension, rather than relying solely on horizontal heat spreading. Multiple heat dissipation structures are positioned at different vertical levels and depths within the substrate, creating a three-dimensional thermal management architecture that efficiently conducts heat away from high-power transistor devices while maintaining a compact horizontal footprint.
2Area of stationary object
If amplifier footprint is reduced, then device size is improved, but thermal dissipation capability worsens
Solution Approach 1:
The patent embeds multiple heat dissipation structures within the module substrate at different depths and positions, creating a nested configuration where heat dissipation elements are integrated throughout the substrate volume. This nested architecture allows efficient thermal management within a compact footprint by utilizing vertical space and distributing heat conduction paths throughout the module structure.
3Temperature
If multiple heat dissipation structures are embedded in the module substrate, then thermal management is improved, but device complexity increases
Solution Approach 1:
The embedded heat dissipation structures serve dual functions: they provide thermal management by conducting heat away from transistor devices, and they establish electrical ground connections for the amplifier circuitry. This multi-functionality reduces overall device complexity by combining thermal and electrical functions into integrated structures rather than requiring separate components.
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 enables efficient heat management and compact power amplifier modules that can operate at higher power levels without compromising thermal performance.
Implementation Method 1
heat generated by the power transistor die is conveyed through the ground/heat dissipation structure
Data Source
AI summary
A power amplifier module includes a module substrate. First and second heat dissipation structures extend through the module substrate, and each has a first surface exposed at a mounting surface of the module substrate, and a second surface exposed at a bottom surface of the module substrate. The first surfaces of the first and second heat dissipation structures are physically separated by a portion of the mounting surface. First and second amplifier dies are coupled to the first surface of the first heat dissipation structure. The first amplifier die includes a first power transistor that functions as a driver amplifier. The second amplifier die includes a second power transistor that functions as a first final amplifier. The third amplifier die is coupled to the first surface of the second heat dissipation structure, and the third amplifier die includes a third power transistor that functions as a second final amplifier.