Experimental performance of an adaptive digital linearized power amplifier
Experimental performance of an adaptive digital linearized power amplifier
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DOI：
10.1109/mwsym.1992.188186
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发表时间：
1992-06
期刊：
影响因子：
--
通讯作者：
A. Wright;W. G. Durtler
中科院分区：
文献类型：
--
作者：
A. Wright;W. G. Durtler
作者展示了实验结果，其中自适应复增益预失真器使工作在接近饱和状态的 AB 类放大器的带外频谱发射减少了 20 dB 以上。实验结果表明，AB 类功率放大器可以在不牺牲效率的情况下实现线性化。尽管在相邻信道中实现了显着的频谱减少，但带外频谱下限是平坦的，并且与带内频谱相比约为 -50 dB。复杂的增益预失真器具有两个明显的优点：设计工程师不必被迫将功率放大器回退到其线性但效率极低的工作点；自适应校正可以轻松补偿频率变化、偏置漂移、工作点、老化和热应力的影响。>
The authors present experimental results in which an adaptive complex gain predistorter achieved a reduction in out-of-band spectral emissions in excess of 20 dB for a class AB amplifier operating close to saturation. The experimental results demonstrate that a class AB power amplifier may be linearized without sacrificing efficiency. Although significant spectral reduction was achieved in the adjacent channel, the out-of-band spectral floor was flat and approximately -50 dB from the inband spectra. The complex gain predistorter exhibits two distinct advantages: a design engineer is not forced to back off a power amplifier to its linear but highly inefficient operating point; and adaptive correction allows the effects of frequency changes, drift in bias, operating point, aging and thermal stress to be readily compensated.>