Doherty Power Amplifier Harmonic Control for OPBO Efficiency
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Solution Overview
Problem
Existing power amplifiers, particularly Doherty amplifiers, face inefficiencies due to the use of numerous passive components, which affect their performance at optimal power back-off (OPBO).
Innovation Solution
Incorporating two input and two output harmonic control circuits to control harmonic resonance and parasitic capacitance integration in a Doherty amplifier, ensuring low impedance at even and odd harmonic frequencies, thereby optimizing signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a large number of passive components are used in the circuit design of the power amplifier, then the operating efficiency at optimum power back-off is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple harmonic control functions into integrated circuits that simultaneously manage even and odd harmonic frequencies. The input harmonic control circuit and output harmonic control circuit are merged with the Doherty amplifier structure, allowing multiple passive components to be consolidated into unified control modules that reduce overall circuit complexity while maintaining efficiency benefits.
Solution Approach 2:
The harmonic control circuits are designed to perform multiple functions simultaneously - controlling both even and odd harmonic frequencies, managing impedance matching, and optimizing power back-off characteristics. This multi-functionality allows a single circuit design to replace what would traditionally require multiple separate passive components, thereby reducing device complexity while preserving operating efficiency.
2Productivity
If harmonic control circuits are added to control harmonic resonance, then amplification efficiency is improved, but device complexity increases
Solution Approach 1:
The patent divides the harmonic control function into distinct input and output harmonic control circuits, each handling specific harmonic frequencies. This segmentation allows for targeted control of even and odd harmonics without requiring a completely complex redesign of the entire amplifier, enabling efficiency improvements through modular additions rather than systemic overhauls.
Solution Approach 2:
The harmonic control circuits act as intermediary elements between the main Doherty amplifier stages, providing controlled impedance transformations and harmonic management. These intermediary circuits mediate the interaction between the main and auxiliary amplifiers, enabling efficient harmonic control while maintaining a relatively simple overall structure through the use of intermediate control stages rather than direct complex modifications.
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
The solution enhances the amplification efficiency of the power amplifier by ensuring signals at specific harmonic frequencies approach desired load impedances, reducing overall area requirements through equivalent transformations.
Implementation Method 1
two input and two output harmonic control circuits to control harmonic resonance
Data Source
AI summary
A power amplifier includes a Doherty amplifier, and two input harmonic control circuits and two output harmonic control circuits configured to control harmonic resonance. The Doherty amplifier includes an input circuit, an output circuit, a main transistor and an auxiliary transistor arranged in parallel with the main transistor. A terminal of each one of the two input harmonic control circuits is connected to the input circuit, and another terminals of the two input harmonic control circuits are connected to input terminals of the main transistor and the auxiliary transistor, respectively. A terminal of each one of the two output harmonic control circuits is connected to the output circuit, and another terminal of each one of the two output harmonic control circuits is connected to an output terminal of the main transistor and the auxiliary transistor, respectively.