Doherty RF Amplifier Layout for Harmonic and Impedance Efficiency
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Solution Overview
Problem
The challenge is to miniaturize radio frequency amplifier devices while maintaining high amplification efficiency, as existing Doherty amplifiers face difficulties in reducing harmonic input and impedance mismatch, leading to efficiency losses.
Innovation Solution
The proposed solution involves a Doherty amplifier circuit with a main amplifier equipped with a first harmonic processing circuit to suppress harmonics and a peak amplifier with a second fundamental matching circuit to address impedance mismatch, reducing the number of circuits and surface area, thereby miniaturizing the device while maintaining high efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If both harmonic processing circuit and fundamental matching circuit are provided in main amplifier and peak amplifier, then amplification efficiency is improved, but device area increases
Solution Approach 1:
The patent divides the Doherty amplifier into two functional segments: main amplifier and peak amplifier. Each segment is selectively equipped with only the circuit type it needs - the main amplifier has only harmonic processing circuit while the peak amplifier has only fundamental matching circuit. This segmentation eliminates redundant circuits and reduces overall device area while maintaining amplification efficiency.
Solution Approach 2:
The patent applies local quality by assigning different circuit configurations to different parts of the amplifier system based on their specific functional requirements. The main amplifier portion is configured with harmonic processing circuitry optimized for its role, while the peak amplifier portion is configured with fundamental matching circuitry optimized for its role, rather than uniformly equipping both with all possible circuits.
2Loss of energy
If harmonic processing circuit is added to suppress harmonics, then amplification efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments the harmonic suppression function to only the main amplifier where it is most needed, rather than implementing it in both amplifiers. This reduces overall circuit complexity while maintaining the harmonic suppression benefit where it provides the greatest efficiency improvement.
Solution Approach 2:
The patent applies partial action by implementing harmonic processing only in the main amplifier rather than in both amplifiers. This partial implementation is sufficient to achieve the desired amplification efficiency improvement without unnecessarily increasing device complexity throughout the entire system.
3Loss of energy
If fundamental matching circuit is added to match impedance, then amplification efficiency is improved, but device area increases
Solution Approach 1:
The patent segments the impedance matching function to only the peak amplifier where it is most needed, rather than implementing it in both amplifiers. This reduces overall device area while maintaining the impedance matching benefit where it provides the greatest efficiency improvement.
Solution Approach 2:
The patent applies local quality by configuring the peak amplifier with fundamental matching circuitry specifically optimized for its impedance matching requirements, while leaving the main amplifier without this circuitry since it has different matching characteristics. This localized approach reduces overall device area.
Data Source
AI summary
A radio frequency amplifier circuit includes a Doherty amplifier including a main amplifier and a peak amplifier. The main amplifier includes a first input end, a first output end, and a first transistor. The main amplifier includes only a first harmonic processing circuit among the first harmonic processing circuit and a first fundamental matching circuit. The peak amplifier includes a second input end, a second output end, and a second transistor. The peak amplifier includes only a second fundamental matching circuit among a second harmonic processing circuit and the second fundamental matching circuit.