Saturated Power Amplifier Load Matching Beyond Power-Match Impedance
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Solution Overview
Problem
Current high-efficiency power amplification apparatuses for mobile communication systems, such as Class-E, inverse Class-E, Class-D, and inverse Class-D, face challenges in achieving zero-voltage switching due to parasitic harmonics and large output capacitance, while Class-F and inverse Class-F require complex harmonic control circuits, making it difficult to implement high-efficiency power amplification without additional circuits.
Innovation Solution
A saturated power amplification apparatus using a complex load impedance exceeding the impedance generated during power matching, which includes a power device and an output matcher to match the load impedance, allowing operation in both the linear and knee regions to generate a large amount of harmonic current, thereby achieving high efficiency without additional circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If Class-E, inverse Class-E, Class-D, or inverse Class-D power amplification apparatus is used, then high efficiency is achieved through switching operation, but zero-voltage switching cannot be achieved due to parasitic harmonics and large output capacitance
Solution Approach 1:
The patent changes the operating parameters by introducing a complex load impedance with specific resistance and reactance values that differ from conventional power matching impedance. This parameter change enables the power device to operate in both linear and knee regions, achieving high efficiency while overcoming the limitation of parasitic harmonics and output capacitance that prevent zero-voltage switching in conventional switching-mode amplifiers.
2Loss of energy
If Class-F or inverse Class-F power amplification apparatus is used, then high efficiency is achieved through harmonic control, but complex harmonic control circuits and fundamental frequency matching circuits are required
Solution Approach 1:
The patent extracts and eliminates the complex harmonic control circuits and fundamental frequency matching circuits from the conventional Class-F amplifier architecture. Instead, it uses a simplified complex load impedance network that inherently provides both harmonic control and power matching functions, thereby achieving high efficiency without the circuit complexity of traditional Class-F designs.
Solution Approach 2:
The complex load impedance network serves multiple functions simultaneously: it provides harmonic control, power matching, and enables operation in both linear and knee regions. This multi-functional approach replaces the separate harmonic control circuits and matching circuits required in conventional Class-F amplifiers, reducing overall device complexity while maintaining high efficiency.
3Power
If conventional power matching impedance is used, then maximum power transfer is achieved, but power amplification efficiency is limited to 45%-50%
Solution Approach 1:
The patent deliberately departs from conventional power matching impedance parameters by introducing a complex load impedance with specific resistance and reactance components. This parameter change allows the amplifier to operate in both linear and knee regions, achieving superior efficiency of 70% or higher while maintaining effective power transfer, thus resolving the trade-off between power transfer and efficiency.
Data Source
AI summary
A saturated power amplification apparatus and a method for controlling the same are provided, in which a power device is provided, and an output matcher matches a load impedance of the power device. The load impedance is a complex impedance exceeding an impedance generated during power matching in the saturated power amplification apparatus.