Harmonic Power Amplifier Output Matching for Wideband Efficiency
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Solution Overview
Problem
Existing radio-frequency power amplifiers face challenges in achieving high efficiency and high bandwidth simultaneously, with complex harmonic impedance matching requirements that reduce efficiency and limit their application in higher frequency ranges.
Innovation Solution
A harmonic power amplifying circuit with high efficiency and high bandwidth is designed, comprising an input matching network, a transistor, and an output matching network that enables continuous inverse F and continuous F amplification modes, using a third-order low pass filter and parasitic network to simplify harmonic impedance matching, and employing a processor circuit for optimal impedance determination and network design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If class-E power amplifier structure is used, then efficiency is improved, but operating frequency is limited due to upper limit frequency
Solution Approach 1:
The patent divides the frequency band into multiple segments (first frequency band and second frequency band), and uses different amplification modes (continuous inverse F mode and continuous F mode) for different segments. This segmentation allows the power amplifier to achieve high efficiency in each band while expanding the overall operating frequency range beyond the limitations of a single class-E structure.
2Adaptability or versatility
If continuous harmonic-control power amplifier is used, then bandwidth is improved, but impedance matching complexity increases significantly
Solution Approach 1:
The patent dynamically switches between continuous inverse F amplification mode and continuous F amplification mode depending on the frequency band. This dynamic operation simplifies the impedance matching requirements compared to maintaining continuous harmonic control across the entire bandwidth, as each mode has simpler matching characteristics suitable for its specific frequency range.
3Loss of energy
If class-F power amplifier structure is used, then efficiency is improved, but bandwidth becomes narrow due to precise harmonic impedance control requirements
Solution Approach 1:
The patent merges continuous inverse F power amplifier and continuous F power amplifier into a single power amplifying circuit. By combining these two structures and switching between their respective amplification modes, the circuit achieves high efficiency (over 60%) while also achieving wide bandwidth (over 80% relative bandwidth), resolving the contradiction between efficiency and bandwidth.
Data Source
AI summary
Embodiments of the present disclosure include a harmonic power amplifying circuit with high efficiency and high bandwidth and a radio-frequency power amplifier. The circuit comprises an input matching network (11), a transistor (M), and an output matching network (12); a gate of the transistor (M) connected to an output end of the input matching network (11), a drain thereof connected to an input end of the output matching network (12), and a source thereof being grounded; wherein the output matching network (12) enables a lower sideband of the harmonic power amplifying circuit to work in a continuous inverse F amplification mode and an upper sideband of the harmonic power amplifying circuit to work in a continuous F amplification mode; wherein the output matching network (12) and a parasitic network of the transistor (M) form a low pass filter. By transitioning from the continuous inverse F power amplifier working mode to the continuous F power amplifier working mode, the efficiency of a continuous harmonic control power amplifier is effectively improved to be higher than 60%, a relative bandwidth is improved to be higher than 80%, and the harmonic impedance is simple to match and easy to realize.