摘要
设计了一种简单而有效的射频预失真器。通过理论分析指出,为了灵活有效地产生期望的预失真特性,预失真器应包含至少两个独立调节变量。以此为依据,提出了一个由二极管和分别与之串联和并联的电阻和电容组成的预失真电路,将其应用于工作在1.9 GHz、输出功率为43 dBm的功放,三阶互调失真系数(IMD3)改善10 dBc。该预失真器不仅对非线性改善效果明显,与同类预失真电路相比,还具有结构简单、体积小、成本低的优点。
A simply configurated and effective RF predistorter is proposed. Further theoretical analysis demonstmtes that to generate the desired predistortion characteristics flexibly and effectively, two independent variables of adjustments at least are needed. Then based on the above conclusion a predistortion circuit composed of a diode with a series resistor and a shunt capacitor is presented. Applying it to the power amplifier operating at 1.9 GHz with output power of 43 dBm, the IMD3 is improved by 10 dBc. Compared with other predistortion circuits of the same kind, it is simple, miniature, cost effective as well as giving the great linearity improvement.
出处
《电讯技术》
北大核心
2011年第5期104-108,共5页
Telecommunication Engineering
