Doherty Power Amplifier Thermal Coupling for Carrier Heat Control
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Solution Overview
Problem
Existing Doherty amplifiers face issues with heat management, particularly in the carrier amplifier, leading to potential temperature increases and degradation due to excessive heat generation.
Innovation Solution
The power amplification circuit design incorporates a carrier amplifier and peak amplifier on the same semiconductor substrate, utilizing conductive paths and thermally conductive members to efficiently transfer heat from the carrier amplifier to the peak amplifier, reducing temperature increases and maintaining amplifier performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the carrier amplifier operates always in a saturated state to maintain amplification performance, then the amplification efficiency is improved, but the temperature of the carrier amplifier increases due to excessive heat generation
Solution Approach 1:
The patent combines the carrier amplifier and peak amplifier on the same semiconductor substrate, enabling thermal coupling between the two amplifiers. This merging allows the heat generated by the carrier amplifier to be transferred to the peak amplifier, which operates in a cooler state, thereby reducing the carrier amplifier's temperature while maintaining its saturated operation for high amplification efficiency.
Solution Approach 2:
The patent introduces a thermal coupling mechanism as an intermediary between the carrier amplifier and peak amplifier. This thermal coupling acts as a heat transfer pathway that mediates the thermal management, allowing excess heat from the carrier amplifier to be redirected to the peak amplifier, thus resolving the temperature issue without compromising amplification performance.
2Device complexity
If the carrier amplifier and peak amplifier are placed on separate substrates, then the thermal management is simplified, but the heat exhaustion efficiency from the carrier amplifier is reduced
Solution Approach 1:
The patent merges both amplifiers on a single semiconductor substrate, creating direct thermal coupling. This integration enables efficient heat transfer from the carrier amplifier to the peak amplifier through the substrate's thermal pathways, significantly improving heat exhaustion efficiency compared to separate substrate configurations.
Solution Approach 2:
The patent converts the harmful effect of heat generation in the carrier amplifier into a beneficial thermal transfer opportunity. By positioning the peak amplifier nearby on the same substrate, the excess heat from the carrier amplifier is transformed into a heat source that can be managed through the peak amplifier's thermal pathways, turning a thermal problem into a thermal solution.
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 effectively suppresses temperature rises in the carrier amplifier, preventing degradation and enhancing the amplification circuit's efficiency and performance by efficiently exhausting heat through multiple conductive and thermal pathways.
Implementation Method 1
utilizing conductive paths and thermally conductive members to efficiently transfer heat from the carrier amplifier to the peak amplifier
Data Source
AI summary
A power amplification circuit including: a power splitter which splits an input signal into a first signal and a second signal; a first carrier amplifier which amplifies the first signal to output a first amplified signal; a first peak amplifier which amplifies the second signal when a power level of the second signal is larger than or equal to a predetermined power level to output a second amplified signal; and a combiner which combines the first amplified signal and the second amplified signal, in which the first carrier amplifier and the first peak amplifier are provided to a same semiconductor substrate.