RF Module Stacking With Thermal Conductor for PA Heat Dissipation
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Solution Overview
Problem
The degradation of power amplifier characteristics due to insufficient heat dissipation in radio-frequency modules is a challenge, particularly in mobile communication devices with complex circuit arrangements.
Innovation Solution
An integrated circuit design incorporating a first base made of silicon or gallium nitride, a second base made of gallium arsenide or silicon germanium, and a high thermal conductive member made of copper, which is disposed between the electric circuit and the power amplifier circuit to enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If controllers are stacked above power amplifiers on a packaging substrate to reduce module size, then the radio-frequency module size is reduced, but heat dissipation from power amplifiers becomes insufficient
Solution Approach 1:
The patent transitions from planar arrangement to three-dimensional stacking, placing the controller above the power amplifier in the vertical dimension. This spatial reconfiguration reduces the horizontal footprint while managing heat through vertical thermal conduction paths to the substrate.
Solution Approach 2:
The patent introduces an intermediate thermal management structure between the power amplifier and controller. This intermediary component facilitates heat transfer from the power amplifier while maintaining electrical isolation and structural integrity, enabling effective thermal management in the stacked configuration.
2Power
If power amplifiers are operated at high power to meet communication demands, then communication performance is improved, but heat generation increases causing characteristic degradation
Solution Approach 1:
The patent implements thermal feedback mechanisms where temperature sensors monitor the power amplifier's thermal state and provide feedback to the control circuit. This enables dynamic power adjustment and thermal protection, preventing characteristic degradation while maintaining high power operation when conditions permit.
Solution Approach 2:
The patent employs dynamic parameter adjustment of the power amplifier based on thermal conditions. Operating parameters such as power level, duty cycle, and frequency are modified in response to temperature changes, allowing high power operation during cool periods while preventing overheating-induced degradation.
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 design contributes to a reduction in the size of the radio-frequency module while suppressing the degradation of power amplifier characteristics due to heat.
Implementation Method 1
a high thermal conductive member that has at least a part formed of a high thermal conductive material having a thermal conductivity higher than the first semiconductor material and that is disposed between the electric circuit and the power amplifier circuit
Data Source
AI summary
An integrated circuit includes a first base that has at least a part formed of a first semiconductor material and that includes an electric circuit, a second base that has at least a part formed of a second semiconductor material having a thermal conductivity lower than the first semiconductor material and that includes a power amplifier circuit, and a high thermal conductive member that has at least a part formed of a high thermal conductive material having a thermal conductivity higher than the first semiconductor material and that is disposed between the electric circuit and the power amplifier circuit. At least a part of the high thermal conductive member overlaps at least a part of the first base and at least a part of the second base in plan view. The high thermal conductive member is in contact with the first base and the second base.