RF Module Stacking Layout for Power Amplifier Heat Isolation
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Solution Overview
Problem
The RF module's power amplifier generates heat, causing temperature variations that deteriorate the output characteristics of the transmission amplifier circuit, and the existing solutions do not effectively address this issue.
Innovation Solution
A radio frequency module design where the power amplifier and control circuit are stacked on one principal surface, and the first circuit component is on the opposite surface, reducing temperature differences and optimizing amplification characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the power amplifier and control circuit are disposed close together on the same substrate, then the device size is reduced, but the temperature difference between the power amplifier and control circuit increases, deteriorating output characteristics
Solution Approach 1:
The patent transitions from a planar arrangement to a three-dimensional stacked configuration. The control circuit is positioned on the first surface of the substrate while the power amplifier is positioned on the second surface, utilizing the vertical dimension to reduce thermal interference while maintaining spatial proximity for compactness.
Solution Approach 2:
The module is segmented into two distinct surfaces of the substrate, with different functional components placed on each surface. This segmentation allows the hot power amplifier and temperature-sensitive control circuit to be physically separated in the vertical direction while remaining integrated in the same module.
2Power
If the power amplifier outputs high-power transmission signals, then the transmission capability is improved, but heat is generated locally, causing temperature variations and deteriorating output characteristics
Solution Approach 1:
The control circuit is extracted from the same physical location as the power amplifier and placed on the opposite surface of the substrate. This extraction removes the temperature-sensitive control circuit from the thermal environment generated by the high-power amplifier, eliminating the harmful thermal interference.
Solution Approach 2:
The substrate acts as an intermediary structure that physically separates the power amplifier and control circuit while maintaining their functional connection. The substrate's thermal properties help manage heat distribution, preventing excessive temperature rise in the control circuit region.
Data Source
AI summary
A radio frequency module includes: a module board that includes a first principal surface and a second principal surface on opposite sides of the module board; a power amplifier configured to amplify a transmission signal; a first circuit component; and a power amplifier (PA) control circuit configured to control the power amplifier. The power amplifier and the PA control circuit are stacked on the first principal surface, and the first circuit component is disposed on the second principal surface.