Asymmetrical Doherty Power Amplifier Layout for Heat Dissipation
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Solution Overview
Problem
Conventional Doherty power amplifying circuits face issues with heat concentration, high power consumption, and increased costs due to the large number of devices and area required, which affects heat dissipation and reliability.
Innovation Solution
The implementation of a Doherty power amplifying circuit with two asymmetrical two-branch power devices, where each device integrates two power amplifiers, with one forming a peak power amplifier and the other jointly forming a main power amplifier, dispersing heat consumption and reducing the number of devices and circuit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional 3-branch Doherty power amplifying circuit uses 3 separately encapsulated power devices, then the circuit can amplify high peak-to-average power ratio signals, but the main power amplifier concentrates most heat consumption leading to poor heat dissipation and reduced reliability
Solution Approach 1:
The invention segments the main power amplifier function across multiple power devices (at least two) within a single encapsulated asymmetrical two-branch power device. Instead of one main power amplifier handling all power amplification, the segmentation distributes the heat-generating function across multiple devices, with each power amplifier having a maximum output power of not more than 1/2 of the main power amplifier, thereby dispersing heat concentration and improving reliability.
2Ease of manufacture
If a conventional 3-branch Doherty power amplifying circuit uses 3 separately encapsulated power devices, then the circuit achieves high efficiency operation, but the larger number of devices increases module area and manufacturing costs
Solution Approach 1:
The invention merges multiple power amplifiers into a single encapsulated asymmetrical two-branch power device. Specifically, at least two power amplifiers are integrated into one power device, where one power amplifier forms the peak power amplifier and the other power amplifiers jointly form the main power amplifier. This merging reduces the total number of separately encapsulated devices from three to two, thereby reducing module area and manufacturing costs while maintaining the Doherty amplification function.
Data Source
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AI summary
Embodiments of the present invention disclose a Doherty power amplifying circuit. The Doherty power amplifying circuit includes at least two asymmetrical two-branch power devices, and each of the at least two asymmetrical two-branch power devices includes two power amplifiers; and in the at least two asymmetrical two-branch power devices, one power amplifier included in each asymmetrical two-branch power device separately forms a peak power amplifier of the Doherty power amplifying circuit, and the other power amplifiers included in all the asymmetrical two-branch power devices jointly form a main power amplifier of the Doherty power amplifying circuit. The present invention further correspondingly discloses a power amplifier. The use of the Doherty power amplifying circuit and the power amplifier in the present invention helps improve heat dissipation of the main power amplifier, and reduce the number of devices of a circuit, an area of the circuit, and costs.