Power Amplifier Output Matching With Harmonic Rejection Resonators
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Solution Overview
Problem
Current radio frequency electronic systems, particularly front-end systems, face challenges in efficiently amplifying and processing RF signals across a wide frequency range while minimizing harmonic rejection and maintaining compactness and cost-effectiveness.
Innovation Solution
The implementation of a power amplifier system on a semiconductor-on-insulator die, incorporating second- and third-order harmonic rejection circuits, along with a cascode configuration of field effect transistors and an output matching circuit, enhances signal amplification and reduces harmonic interference, integrated with biasing circuitry and a switch for antenna connection control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a power amplifier is used to amplify RF signals, then the signal strength is improved, but harmonic distortion and reflections increase
Solution Approach 1:
The patent converts the harmful harmonic signals generated by the power amplifier into beneficial elements by using them to resonate the rejection circuits. The second-order harmonic rejection circuit resonates at twice the fundamental frequency, and the third-order harmonic rejection circuit resonates at three times the fundamental frequency, thereby converting the harmful harmonics into useful resonant energy for rejection.
Solution Approach 2:
The patent introduces intermediary harmonic rejection circuits between the power amplifier and the output. These circuits act as mediators that selectively reject harmonic frequencies while allowing the fundamental frequency to pass through, thereby reducing harmonic distortion without affecting the main signal.
2Object-generated harmful factors
If multiple harmonic rejection circuits are added, then harmonic distortion is reduced, but device complexity increases
Solution Approach 1:
The patent combines multiple harmonic rejection functions into a single integrated circuit structure. The second-order harmonic rejection circuit and the third-order harmonic rejection circuit are merged into one unified design, sharing common elements and reducing overall circuit complexity while maintaining effective harmonic rejection for both orders.
Solution Approach 2:
The harmonic rejection circuit is designed to perform multiple functions simultaneously - rejecting both second-order and third-order harmonics while maintaining a compact structure. This multi-functional approach reduces the need for separate circuits for each harmonic order, thereby reducing overall device complexity.
3Object-generated harmful factors
If harmonic rejection circuits are implemented, then harmonic interference is reduced, but the circuit area increases
Solution Approach 1:
The patent employs a nested structure where the second-order harmonic rejection circuit and the third-order harmonic rejection circuit are arranged in a nested configuration. The circuits share common nodes and elements, with the second-order rejection circuit positioned between the power amplifier output and a first node, and the third-order rejection circuit positioned between the power amplifier output and the same first node, creating a compact nested arrangement that reduces overall circuit area.
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
This configuration improves power added efficiency, linearity, and robustness, achieving superior performance metrics such as higher power added efficiency and compact layout while reducing reflections and harmonic interference in RF signal processing.
Implementation Method 1
first and second second-order harmonic rejection circuits configured to resonate at about two times the fundamental frequency
Implementation Method 2
third order harmonic rejection circuit configured to resonate at about three times the fundamental frequency
Data Source
AI summary
A semiconductor-on-insulator die can include a power amplifier configured to amplify a radio frequency input signal having a fundamental frequency. The die can further include an output matching circuit including first and second second-order harmonic rejection circuits configured to resonate at about two times the fundamental frequency and a third order harmonic rejection circuit configured to resonate at about three times the fundamental frequency.