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该论文提出了一种用于EER/极性发射机的开关电容功率放大器，解决了传统线性PA在非恒包络调制下效率低的问题。通过开关电容结构实现高效率放大，同时保持线性度。
Wireless high-speed communication standards such as WiFi, WiMax and LTE use spectrally-efficient OFDM modulation that encodes signal information in both amplitude and phase. Use of this non-constant envelope modulation requires a linear PA, operating at a less-than-peak signal level to realize higher linearity and inherently reduced efficiency. Because the PA is the dominant power consumer in most RF transceivers, operation with reduced efficiency leads to short battery lifetime and reduced mobility. Consequently, many efforts to utilize more efficient switching amplifiers with linearization circuitry have been made, notably through pulse-width modulation [1], outphasing [2] and envelope elimination and restoration (EER) [3,4]. Of the three, EER offers the best performance tradeoff between linearity, output power and efficiency; however, most previous implementations have come at the cost of large, power-hungry analog
Sang-Min Yoo, Jeffrey S. Walling, Eum Chan Woo, David J. Allstot
University of Washington, Seattle, WA