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该论文提出了一种5-6GHz电流模式子谐波切换数字功率放大器，通过以次谐波频率切换PA单元来提高功率回退效率，克服了电压模式PA在高频下动态功耗大的问题。
Enhancing PA efficiency in the power back-off (PBO) region has become an important design objective due to the high peak-to-average power-ratio (PAPR) modulation in modern communications. Recently, a voltage-mode subharmonic switching (SHS) digital PA architecture has been reported in [1-3]. The concept of SHS is to toggle a PA cell at a subharmonic frequency for more efficient PBO operation. However, the dynamic power loss of voltage-mode PAs (e.g., Class-D PAs) increases linearly with the operating frequency [4]. On the other hand, current-mode digital PAs are more suitable for higher carrier frequencies due to their zero-voltage-switching (ZVS) operation to reduce dynamic loss. However, the existing current-mode PA architecture still suffers from poor impedance matching at PBO and conduction loss of the driver, leading to distortion and PBO efficiency degradation. To alleviate those drawbacks, we propose a current-mode
Aoyang Zhang, Ce Yang, Mostafa Ayesh, Mike Shuo-Wei Chen
University of Southern California, Los Angeles, CA