电子科技大学学报Issue(2)：190-194,5.DOI:10.3969/j.issn.1001-0548.2015.02.005
基于Sweet Spot的线性高效率功率放大器设计
Design of Linear High-Efficiency Power Amplifiers Based on Sweet Spot Effect
摘要
Abstract
This paper utilizes intermodulation distortion (IMD) sweet spot effect to solve the linear problem of high-efficient power amplifier (PA), so that PA can maintain high levels of both efficiency and linearity. IMD sweet spot is the result of interactions between circuit's small-signal nonlinear distortion (weak nonlinearity) determined by the PA quiescent operating point and large-signal distortion effects determined by the device current turn-on and current saturation (strong nonlinearity). The weak nonlinearity can be controlled by changing the gate bias. By seeking appropriate bias voltage for IMD sweet spot generated at the beginning of the transistor gain compression, PA can achieve high efficiency and good linearity. Based on the effect of sweet spot, a high-efficiency linear PA has been designed. Test results show that at center frequency of 2.2 GHz, 37.1 dBm output powers, 53.4%drain efficiency can be obtained, while the third-order intermodulation distortion (IMD3) and the fifth-order intermodulation distortion (IMD5) are less than−30 dBc.关键词
高效率/交调失真/线性/功率放大器Key words
high-efficiency/intermodulation distortion (IMD)/linear/power amplifiers分类
信息技术与安全科学引用本文复制引用
何松柏,陈金虎,童仁彬,彭瑞敏..基于Sweet Spot的线性高效率功率放大器设计[J].电子科技大学学报,2015,(2):190-194,5.基金项目
国家自然科学基金(61001032,61271036) （61001032,61271036）
