Q波段是我国高速宽带无线通信系统的重点发展频段之一.但受半导体工艺的限制，功率放大器的效率和输出功率低，无法满足采用高峰均比信号的Q波段无线通信发信机的需求。而包络跟踪（ET）功率放大器因其能提高功率回退时的效率而倍受关注.目前对毫米波段宽带、高效、线性功放技术的研究尚处于起步阶段，因此研究Q波段ET技术具有重要的理论意义和实用价值。.本项目将专注于研究Q波段ET功放新的包络带宽削减技术，多包络合成技术，以满足发信机的超大带宽要求；研究ET功放的非线性行为模型，考虑记忆效应的影响，提出漏极电压，偏置状态和输入信号与ET功放整体增益，效率和输出功率的关系，提高功放效率，优化发信机的整体性能；研究针对于包络带宽削减和多包络合成技术的数字预失真模型和预失真器结构，用于提升ET功放线性度。最终将完成Q波段高效、宽带、线性化ET功率放大器的研制。

Q band is one of the key frequency spectrum for the evolution of high-speed wideband wireless communication systems in China. Due to the limitation of semiconductor process, power amplifiers (PAs) normally exhibit low efficiency and output power, which cannot satisfy the requirements of Q-band wireless communication transmitters excited by high Peak-to-average power ratio signals. Meantime, envelope tracking (ET) PA receives more and more attention, since it can significantly improve the PA’s efficiency at backed-off power. However, very few studies have explored the high-efficiency wideband PA with high linearity in the scenario of millimeter wave frequency band. Hence, the research on Q-band ET PA will have important theoretical and practical values.. This project will focus on the development of Q-band ET PA technique. The novel envelope bandwidth reduction method and multi-envelope generation technique will be proposed to satisfy the requirements for the wideband transmitters. The nonlinear behavioral model for Q-band ET PA will be constructed. Moreover, considering the memory effects, the model will build the relationships between the gain, efficiency, output power and the drain voltage, gate bias, input signal, in order to enhance PA’s efficiency and thus optimize the overall performance of the transmitter. Also, the digital predistortion model and linearization architecture will be investigated to improve the linearity of the ET PA, mainly based on envelope bandwidth reduction and multi-envelope generation technique. Finally, a prototype of the Q-band high-efficiency wideband ET PA with high linearity will be built to validate the proposed techniques.