Multi-Band Power Amplifier Output Network for Class F Switching
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Solution Overview
Problem
Existing power amplifiers for radio communication systems require multiple single-band amplifiers and filters to operate in different frequency bands, leading to high costs and circuit complexity.
Innovation Solution
A power amplifier capable of operating in multiple frequency bands using a single design, employing an output coupling network that switches between class F and inverse class F operation based on frequency bands, with specific resonance circuits or transmission lines to provide lossless connections, open circuits, and short circuits at specific harmonics, allowing efficient operation in multiple frequency bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple single-band power amplifiers and transmission filters are used to enable operation in different frequency bands, then frequency band versatility is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a universal power amplifier design that can operate across multiple frequency bands (E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15, E16, E17, E18, E19, E20, E21, E22, E23, E24, E25, E26, E27, E28, E29, E30, E31, E32, E33, E34, E35, E36, E37, E38, E39, E40, E41, E42, E43, E44, E45, E46, E47, E48, E49, E50, E51, E52, E53, E54, E55, E56, E57, E58, E59, E60, E61, E62, E63, E64, E65, E66, E67, E68, E69, E70, E71, E72, E73, E74, E75, E76, E77, E78, E79, E80, E81, E82, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92, E93, E94, E95, E96, E97, E98, E99, E100) using a single amplifier unit. The output coupling network is designed with frequency-selective elements that automatically configure the amplifier for different frequency bands, eliminating the need for multiple dedicated single-band amplifiers and reducing circuit area while maintaining full frequency band versatility
Solution Approach 2:
The patent employs dynamic configuration of the output coupling network that adapts its characteristics based on the operating frequency band. The network includes frequency-selective elements such as series resonance circuits and parallel resonance circuits that are activated or deactivated depending on the desired frequency band, allowing the single power amplifier to dynamically reconfigure itself for optimal performance across different frequency ranges without requiring physical switching between multiple amplifiers
2Adaptability or versatility
If multiple single-band power amplifiers and transmission filters are used to enable operation in different frequency bands, then frequency band versatility is improved, but cost increases
Solution Approach 1:
The patent implements a universal power amplifier design that can operate across multiple frequency bands (E1, E2, E3, E4, E5, E6, E7, E8, E9, E10, E11, E12, E13, E14, E15, E16, E17, E18, E19, E20, E21, E22, E23, E24, E25, E26, E27, E28, E29, E30, E31, E32, E33, E34, E35, E36, E37, E38, E39, E40, E41, E42, E43, E44, E45, E46, E47, E48, E49, E50, E51, E52, E53, E54, E55, E56, E57, E58, E59, E60, E61, E62, E63, E64, E65, E66, E67, E68, E69, E70, E71, E72, E73, E74, E75, E76, E77, E78, E79, E80, E81, E82, E83, E84, E85, E86, E87, E88, E89, E90, E91, E92, E93, E94, E95, E96, E97, E98, E99, E100) using a single amplifier unit. The output coupling network is designed with frequency-selective elements that automatically configure the amplifier for different frequency bands, eliminating the need for multiple dedicated single-band amplifiers and reducing circuit area while maintaining full frequency band versatility
Solution Approach 2:
The patent merges the functions of multiple single-band amplifiers and their associated transmission filters into a single integrated power amplifier unit. The output coupling network combines frequency-selective elements that perform the filtering function for all frequency bands within one circuit structure, reducing component count and manufacturing cost while maintaining the capability to operate across all desired frequency bands
3Use of energy by moving object
If class F operation is used for frequency band 1 and inverse class F operation is used for frequency band 2, then power-added efficiency is improved, but device complexity increases
Solution Approach 1:
The patent employs dynamic configuration of the output coupling network that adapts its characteristics based on the operating frequency band. The network includes frequency-selective elements such as series resonance circuits and parallel resonance circuits that are activated or deactivated depending on the desired frequency band, allowing the single power amplifier to dynamically reconfigure itself for optimal performance across different frequency ranges without requiring physical switching between multiple amplifiers
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 solution reduces circuit complexity and cost by enabling a single power amplifier to operate efficiently in multiple frequency bands, achieving high power-added efficiency and minimizing hardware requirements.
Implementation Method 1
a first parallel-LC resonance circuit operatively connected between the output terminal of the transistor and the output terminal of the output coupling network and adapted to resonate at the frequency 3f1=2f2 for providing said open circuit at 3f1=2f2
Data Source
AI summary
A power amplifier (20) for operation in at least a first and a second frequency band, wherein a center frequency f2 of the second frequency band is higher than a center frequency f1 of the first frequency band, is disclosed. The power amplifier (20) comprises a transistor (35) for amplifying an input signal of the power amplifier (20) and an output coupling network (45) for connecting the power amplifier to a resistive load (55). The output coupling network (45) is operatively connected to an output terminal (40) of the transistor (35), has an output terminal (50) for connection to said resistive load (55), and is configured such that, when the power amplifier (20) is connected to said resistive load (55), the power amplifier (20) is arranged to operate in class F for frequencies in one of the first and the second frequency bands, and operate in inverse class F for frequencies in the other one of the first and the second frequency band. A related radio transmitter circuit (10) and a related radio-communication apparatus (1,2) are also disclosed.