Abstract:In this paper, a novel outphasing power amplifier (PA) based on class-E amplifiers with shunt capacitances and shunt filters is proposed. The new design provides high drain efficiency for both peak and back-off power levels. A mathematical model for the class-E power amplifier with shunt capacitance and shunt filter is presented. The proposed model enables derivation of load circuit parameters that provide optimum drain efficiency for the peak and back-off power levels using closed form mathematical expression… Show more
“…However, these switching-mode power amplifiers have poor linearity and are unsuitable to replace linear power amplifiers and can be used in advanced architectures with linearization techniques. The LMBA was initially developed to address bandwidth limitations associated with conventional load modulation techniques [12], [13] and to enhance efficiency in the back-off region. Despite its potential for efficiency improvement, the inclusion of an additional control amplifier and a phase shifter contributes to an increase in circuit size.…”
This paper provides a comprehensive overview of the challenges and considerations associated with the design, implementation, and optimization of Load Modulated Balanced Amplifiers (LMBAs). Various research trends, all directed toward enhancing the benefits of the LMBA scheme and addressing its inherent limitations, are outlined. The initial focus is on maximizing efficiency and/or linearity, leveraging different techniques. Another noteworthy trend involves expanding the bandwidth of the LMBA architecture, a topic extensively covered in numerous papers. The other section delves into the most notable advancements in doherty power amplifier (DPA) and comparison with LMBAs. However, there's still a need for new loadmodulation power amplifier designs that can simultaneously maximize efficiency over extended power backoff and a broad frequency range. In essence, this review underscores the ongoing need for innovation in LMBAs design to meet the evolving requirements of 5G/6G communication systems.
“…However, these switching-mode power amplifiers have poor linearity and are unsuitable to replace linear power amplifiers and can be used in advanced architectures with linearization techniques. The LMBA was initially developed to address bandwidth limitations associated with conventional load modulation techniques [12], [13] and to enhance efficiency in the back-off region. Despite its potential for efficiency improvement, the inclusion of an additional control amplifier and a phase shifter contributes to an increase in circuit size.…”
This paper provides a comprehensive overview of the challenges and considerations associated with the design, implementation, and optimization of Load Modulated Balanced Amplifiers (LMBAs). Various research trends, all directed toward enhancing the benefits of the LMBA scheme and addressing its inherent limitations, are outlined. The initial focus is on maximizing efficiency and/or linearity, leveraging different techniques. Another noteworthy trend involves expanding the bandwidth of the LMBA architecture, a topic extensively covered in numerous papers. The other section delves into the most notable advancements in doherty power amplifier (DPA) and comparison with LMBAs. However, there's still a need for new loadmodulation power amplifier designs that can simultaneously maximize efficiency over extended power backoff and a broad frequency range. In essence, this review underscores the ongoing need for innovation in LMBAs design to meet the evolving requirements of 5G/6G communication systems.
“…The high conversion efficiency of OPAs is achieved through phase modulation between two sub-amplifiers, which work in saturation conditions [2]. An efficient power amplifier (PA) solution can be adopted, such as class-E or class-F, by the two sub-amplifiers to boost the conversion efficiency [3][4][5][6]. Many studies have been conducted on OPAs, including circuit topology and design methods.…”
Outphasing power amplifiers (OPAs) can be used in wireless information and power transfer systems due to their excellent conversion efficiency. With the rapid advancement of technology, there is a strong demand for OPAs to achieve wideband and multi-band operations to enhance frequency coverage. This paper provides a comprehensive review of the research progress on the development of broadband and multi-band board-level OPAs. Firstly, the paper introduces the fundamental components of an OPA. Then, the paper delves into a detailed analysis of the load modulation of OPAs. Subsequently, previous works on the circuit topology and design methods for broadband and multi-band OPAs are discussed and compared. The paper highlights various design strategies and their respective advantages and disadvantages. Finally, the paper explores some potential design methods for broadband and multi-band OPAs, discussing emerging technologies and highlighting potential research directions.
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