Power Amplifier Module Layout for Heat Dissipation and Harmonic Control
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Solution Overview
Problem
The increasing output level of power amplifier circuits in fifth-generation communication systems poses challenges in effectively managing heat dissipation and harmonic suppression, as existing solutions struggle to efficiently handle the heat generated by these circuits.
Innovation Solution
A power amplifier module design that incorporates a substrate with an amplifier circuit, harmonic termination circuit, and output matching circuit, where connection wiring lines and a connection pad with a specific configuration enhance heat dissipation by increasing the heat dissipation area without requiring additional heat dissipation components, while maintaining a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the output level of power amplifier circuit is increased, then the communication performance is improved, but the heat generation increases
Solution Approach 1:
The patent utilizes the thickness dimension of the substrate to create a three-dimensional heat dissipation structure. By forming protrusions that extend in the thickness direction and providing heat dissipation fins on their surfaces, the design transforms a two-dimensional heat dissipation problem into a three-dimensional solution, significantly increasing the heat dissipation surface area without expanding the planar footprint of the module.
Solution Approach 2:
The heat dissipation structure is designed and integrated into the substrate before the power amplifier circuit is mounted and operated. The protrusions and heat dissipation fins are pre-formed on the substrate, creating a ready-made thermal management system that immediately begins dissipating heat as soon as the amplifier circuit generates it during operation.
2Temperature
If additional heat dissipation components are added, then the heat dissipation performance is improved, but the module size increases
Solution Approach 1:
The patent merges the heat dissipation function with the substrate structure itself. Instead of adding separate heat dissipation components, the substrate is designed with integrated protrusions and heat dissipation fins that perform both structural support and thermal management functions simultaneously, eliminating the need for additional discrete heat dissipation components.
Solution Approach 2:
The substrate is designed to serve multiple functions: it provides mechanical support for mounting the amplifier circuit, provides electrical connections through connection pads and wiring lines, and simultaneously provides heat dissipation through its integrated protrusion and fin structures. This multi-functional design eliminates the need for separate dedicated heat dissipation components.
3Temperature
If the heat dissipation area is increased, then the heat dissipation performance is improved, but the substrate area increases
Solution Approach 1:
The patent resolves this contradiction by transitioning from two-dimensional heat dissipation (expanding substrate area) to three-dimensional heat dissipation (utilizing thickness direction). The protrusions extend vertically from the substrate surface, and heat dissipation fins are formed on their surfaces, creating additional heat dissipation area in the vertical dimension without increasing the horizontal substrate footprint.
4Reliability
If measures against harmonics are strengthened, then the communication quality is improved, but the device complexity increases
Solution Approach 1:
The patent extracts the harmonic suppression function from the amplifier circuit itself and implements it separately through a dedicated harmonic termination circuit. This separate circuit is connected to the amplifier circuit through connection wiring lines, allowing harmonic suppression to be added without modifying the internal structure of the amplifier circuit, thus maintaining relative simplicity.
Data Source
AI summary
A power amplifier module includes a substrate, an amplifier circuit including a plurality of transistors to be mounted on the substrate and a bump connected to the plurality of transistors, a harmonic termination circuit and an output matching circuit that are disposed in or on the substrate and configured to be electrically connected to the amplifier circuit, a connection pad disposed on the substrate and configured to be connected to the bump, and a plurality of connection wiring lines branching from the connection pad. The plurality of connection wiring lines include at least a first connection wiring line that connects the connection pad and the harmonic termination circuit to each other, a second connection wiring line that connects the connection pad and the output matching circuit to each other, and a third connection wiring line that connects the connection pad and an external power supply to each other.