⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种极坐标天线阻抗检测与调谐技术，用于改善3G/4G CMOS功率放大器的效率，解决因天线阻抗失配导致的效率下降问题。通过实时检测和调谐，提升了功率放大器在失配条件下的整体性能。
efficiency and achieve a long battery life. Therefore, both the peak efficiency and the efficiency loss due to antenna impedance mismatch or power back-off are highly critical design issues. In particular, the challenge of the antenna impedance mismatch is becoming more severe, due to the increased frequency band and smaller antenna size. Moreover, the antenna mismatch also changes with time due to the user proximity effect [1]. Considering the aforementioned challenges, antenna impedance tuning has become a key design issue. Conventional techniques detect scalar magnitude or phase with costly and bulky components such as bidirectional couplers [2,3]. Therefore, it is difficult to tune the antenna impedance in a vector fashion to its optimal value precisely and promptly to track the time-varying mismatch. To
Shouhei Kousai, Kohei Onizuka, Takashi Yamaguchi,
Yasuhiko Kuriyama, Masami Nagaoka Toshiba, Kawasaki, Japan One of the ultimate goals in power amplifier design is to enhance the effective