记忆多项式数字预失真线性化逆E类功放

Linearization for Inverse Class-E RF Power Amplifier by Memory Polynomial Digital Predistortion

摘要: 采用记忆多项式模型的数字预失真器，用于线性化逆E类射频功率放大器，从而获得具有高线性和高效率的射频放大系统，使得开关型的逆E类功率放大器可以适用于具有非恒包络的调制信号的发射。文中设计了一个工作于S频段的具有10W饱和功率的逆E类功率放大器，以具有5MHz信号带宽的单载波WCDMA信号作为测试信号，使用记忆多项式的预失真器对其进行线性化。实验表明，该记忆多项式预失真器能够很好地抑制逆E类功放的动态非线性引起的带外寄生频谱，可以使逆E类功放同时工作于高线性和高效率状态。

Abstract: This paper proposes to design a digital predistorter using memory polynomial to linearize a high efficiency inverse class-E RF power amplifier, which operates as a switch and exhibits very severe nonlinearity. The inverse class-E amplifier is designed to operate at S-band with 10W saturated output power. The excitation for the amplifier is a one-carrier WCDMA signal with 5MHz bandwidth. With digital predistortion linearization, experimental results show a high degree of spectral suppression for out-of-band can be achieved, so that this inverse class-E amplifier can work both with high linearity and high efficiency.