Balanced Power Amplifier Matching Circuit for Second Harmonic Impedance
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Solution Overview
Problem
Existing power amplifier circuits struggle to optimize the impedance of the second harmonic wave, which affects linearity and efficiency.
Innovation Solution
A power amplifier circuit design that includes a matching circuit with capacitors and a microstrip line or inductor, allowing for impedance adjustment of both even and odd harmonic waves, thereby controlling the impedance of the second harmonic wave and improving linearity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a third harmonic-wave control circuit is used, then the impedance of the fundamental wave and the third harmonic wave can be optimized, but the impedance of the second harmonic wave cannot be optimized
Solution Approach 1:
The matching circuit is segmented into multiple independent impedance control paths: a first matching circuit connected to even harmonic waves (including second harmonic) and a second matching circuit connected to odd harmonic waves (including third harmonic). This segmentation allows independent optimization of even and odd harmonic impedances without interference, resolving the contradiction by enabling separate control of different harmonic types.
Solution Approach 2:
The first matching circuit is designed with multi-functionality to handle both second harmonic waves and fundamental waves simultaneously. By configuring the first matching circuit between the power amplifier and the second matching circuit, it serves dual purposes: optimizing even harmonic impedance and maintaining fundamental wave performance, thus expanding the overall adaptability while maintaining reliability.
2Reliability
If impedance control of even harmonic waves is added, then linearity can be improved, but the device complexity increases
Solution Approach 1:
The first matching circuit performs multiple functions by merging impedance control for even harmonics and fundamental waves into a single circuit stage. This combining approach avoids the need for completely separate circuits for each function, thereby improving linearity through even harmonic control while limiting the increase in device complexity through functional integration.
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 design effectively controls the impedance of the second harmonic wave, enhancing the linearity and power-added efficiency of the power amplifier circuit.
Implementation Method 1
a first capacitor having a first end connected to the first output terminal and a second end, a second capacitor having a first end connected to the second output terminal and a second end connected to the second end of the first capacitor
Implementation Method 2
a wiring having a first end connected to the second end of the first capacitor and a second end connected to a ground
Data Source
AI summary
A power amplifier circuit includes a first amplifier that amplifies a first signal that is one of balanced signals and outputs a first amplified signal from a first output terminal, a second amplifier that amplifies a second signal that is another of the balanced signals and outputs a second amplified signal from a second output terminal, a balun that generates a third signal from the first amplified signal and the second amplified signal, and a matching circuit that is provided between the first amplifier and the second amplifier, and the balun.