摘要
研究了一种基于开关线性复合机理的柔性波形功率放大技术。该技术将开关功率放大技术与传统线性功率放大技术有机结合,开关级功率输出包络只作为末级线性功率单元的供电电源以确保系统效率,同时借助于线性功率单元的高阻抗输入、低阻抗输出特性以保证系统输出品质。与传统线性功率放大技术相比,开关线性复合功率放大技术系统输出可兼顾高效率与优波输出的综合静动态特性,对电路的建模分析、参数设计和系统性能评估提供了理论依据,理论分析与仿真结果为实验研究奠定了基础。
Conventional linear power amplifiers are characterized by their low efficiency due to relatively large voltage drop across the output power transistors. A flexible waveform power amplifier based on switch-linear hybrid （SLH） scheme is presented, which combines switching power amplifier with conventional linear power amplifier. The switching stage of the proposed SLH amplifier is used as the power supply for the final linear power unit to insure the system efficiency, and the high output quality is achieved by means of the remarkable feature of high input impedance and low output impedance of the linear power stage. Compared with conventional linear power amplifier, the SLH amplifier possesses the synthetic virtues of both high efficiency and excellent output quality. Modeling and analysis of SLH amplifier serve as theoretical basis for its parameters design and performance evaluation. Theoretical analysis and simulation results will support future experimental research.
出处
《电子科技大学学报》
EI
CAS
CSCD
北大核心
2009年第3期368-371,共4页
Journal of University of Electronic Science and Technology of China
基金
国家自然科学基金(50407017,50877001)
安徽省优秀青年科技基金(08040106809)
安徽省教育厅自然科学基金(KJ2008B102)
关键词
高效率
功率放大
电源纹波抑制比
开关线性复合
high efficiency
power amplifier
power supply ripple rejection ratio
switch-linear hybrid
