Power Amplifier Module Harmonic Attenuation With Low Signal Loss
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Solution Overview
Problem
Existing power amplifier modules experience signal loss due to the frequency characteristics of harmonic termination circuits, which affect impedance matching and lead to increased loss of both harmonic and fundamental components.
Innovation Solution
A power amplifier module configuration that includes a choke inductor and attenuation circuits between the amplifier output and the choke inductor, specifically designed to attenuate harmonic components, thereby reducing signal loss and maintaining the integrity of the fundamental component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a harmonic termination circuit is disposed between the amplifier output terminal and the power amplifier module output terminal, then harmonic components can be attenuated, but signal loss increases due to frequency characteristics affecting impedance matching
Solution Approach 1:
The patent divides the harmonic termination function into two separate circuits: a first attenuation circuit disposed between the amplifier output and choke inductor, and a second attenuation circuit disposed between the choke inductor and power amplifier module output. This segmentation allows each circuit to be optimized for specific frequency ranges, reducing overall signal loss while maintaining effective harmonic attenuation.
Solution Approach 2:
The patent applies different attenuation characteristics to different parts of the frequency spectrum by designing the first and second attenuation circuits with different impedance values and frequency responses. The first circuit handles lower frequency harmonics while the second circuit handles higher frequency harmonics, creating localized optimization for each frequency band.
2Reliability
If a matching circuit includes a harmonic termination circuit, then impedance matching can be improved, but loss of fundamental component increases due to frequency characteristics
Solution Approach 1:
The patent employs dynamic impedance matching by designing the attenuation circuits with frequency-dependent impedance characteristics. The impedance values are optimized to provide good matching at the fundamental frequency while maintaining effective attenuation at harmonic frequencies, allowing the system to adaptively handle different frequency components.
Solution Approach 2:
The patent changes the impedance parameters of the attenuation circuits to optimize performance. By carefully selecting the impedance values of the first and second attenuation circuits, the system achieves broadband impedance matching while minimizing fundamental component loss and maximizing harmonic attenuation.
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 proposed configuration effectively attenuates harmonic components and reduces signal loss, enabling wider-band impedance matching and maintaining the power of the fundamental component, outperforming comparative examples by minimizing signal loss across the carrier frequency band.
Implementation Method 1
A first attenuation circuit disposed between an output terminal of the amplifier and a second end of the choke inductor, the first attenuation circuit attenuating a harmonic component of the amplified signal
Implementation Method 2
a resonant circuit is used to attenuate a harmonic component of an amplified signal
Implementation Method 3
a choke inductor having a first end to which a power supply voltage is applied and a second end from which power supply is provided to the amplifier
Data Source
AI summary
A power amplifier module includes an amplifier that amplifies an input signal and outputs an amplified signal, a matching circuit disposed between an output terminal of the amplifier and a subsequent circuit, a choke inductor having a first end to which a power supply voltage is applied and a second end from which power supply is provided to the amplifier through the output terminal of the amplifier, and a first attenuation circuit disposed between the output terminal of the amplifier and the second end of the choke inductor and configured to attenuate a harmonic component of the amplified signal.