High-Frequency Amplifier Harmonic Feedback for Power Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional high frequency amplifiers face inefficiencies due to increased power consumption and suboptimal impedance matching for harmonic signals, leading to inadequate power efficiency, especially when using parasitic components and passive elements.
Innovation Solution
A high frequency amplifier design that includes a harmonic reflection circuit, a fundamental matching circuit, a harmonic extraction circuit, a phase shifter, and a multiplexing circuit to extract and adjust the harmonic signal, enhancing reflection intensity and power efficiency by returning the harmonic to the transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a signal source that generates a harmonic signal is used, then the harmonic signal can be generated, but power consumption increases
Solution Approach 1:
The invention uses the transistor's own operation to generate the harmonic signal internally, eliminating the need for an external harmonic signal source. The transistor naturally generates harmonics during amplification, and these are extracted and fed back through the reflection circuit, making the system self-sufficient and reducing power consumption.
Solution Approach 2:
The invention extracts the harmonic signal that is naturally generated by the transistor during amplification. By using an extraction circuit to separate the harmonic component from the amplified signal and then feeding it back through the reflection circuit, the system utilizes internally generated harmonics rather than requiring external generation, thereby reducing power consumption.
2Device complexity
If passive elements are used for impedance matching, then the circuit is simple, but the impedance for the harmonic cannot be set to optimal value, resulting in insufficient power efficiency improvement
Solution Approach 1:
The invention introduces a feedback mechanism where the harmonic signal is extracted from the amplified output, processed through the reflection circuit, and fed back to the transistor. This feedback loop enables dynamic optimization of the harmonic impedance, allowing the system to achieve optimal power efficiency that cannot be obtained with static passive matching elements alone.
Solution Approach 2:
The invention changes the impedance parameters dynamically by using the reflection circuit to adjust the harmonic signal characteristics. The reflection circuit modifies the harmonic impedance based on the transistor's operating conditions, enabling optimal impedance matching that adapts to varying conditions, thereby improving power efficiency beyond what fixed passive elements can achieve.
3Device complexity
If the harmonic is not extracted and processed, then the circuit is simpler, but the power efficiency cannot be sufficiently improved
Solution Approach 1:
The invention implements a feedback system where the harmonic signal is extracted from the amplified output, processed through the reflection circuit, and fed back to the transistor. This feedback mechanism enables the system to optimize power efficiency by controlling the harmonic signal characteristics, demonstrating that the additional complexity of extraction and processing circuits is justified by the significant power efficiency improvements achieved.
Data Source
AI summary
A high frequency amplifier 1 includes an input terminal PIN, an output terminal POUT, a transistor 5 configured to amplify an RF signal applied to the input terminal PIN, a matching circuit 9 for a fundamental of the RF signal and a reflection circuit 7 for a harmonic relative to the fundamental, the matching circuit 9 and the reflection circuit 7 being connected in series between the transistor 5 and the output terminal POUT, an extraction circuit 13 configured to extract a harmonic appearing at the output terminal POUT, processing circuits 15, 17 configured to adjust a phase and intensity of the harmonic extracted by the extraction circuit 13, and a multiplexing circuit 19 configured to multiplex the harmonic processed by the processing circuits 15, 17 to the harmonic reflected by the reflection circuit 7 and give the multiplexed harmonic to the transistor 5.