We present a diplexed power amplifier (PA) architecture for achieving more than octave bandwidth with high efficiency. Two relatively narrowband single-stage PAs are connected with a contiguous diplexer-combiner network. The average efficiency across the larger than octave band is maintained with a flat gain response from 1.8 to 4 GHz. To maintain efficiency, the two transistors are biased in class B. One of the paths is turned on in each subband, and in the transition region, the two PAs power combine. In both element amplifiers, a 7-W Qorvo GaN packaged device is used to achieve approximately 35% fractional bandwidth, from 1.8 to 2.7 and 3 to 4 GHz, respectively. Averaged over the full band, the amplifier achieves an average measured power-added efficiency of 43.7%, the output power of 38.0 dBm, and the gain of 8.8 dB. Linearization using digital predistortion is demonstrated, with the benefit of reduced complexity due to the frequency isolation of the two PA branches.

中文翻译：

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宽带双工功率放大器

我们提出了一种双工功率放大器 (PA) 架构，可高效实现超过倍频程的带宽。两个相对窄带的单级 PA 与一个连续的双工器-组合器网络相连。大于倍频程的平均效率保持在 1.8 至 4 GHz 的平坦增益响应。为了保持效率，两个晶体管在 B 类中偏置。其中一个路径在每个子带中打开，在过渡区，两个 PA 功率组合。在两个元件放大器中，7-W Qorvo GaN 封装器件用于实现大约 35% 的分数带宽，分别为 1.8 至 2.7 和 3 至 4 GHz。在整个频段上平均，放大器实现了 43.7% 的平均测量功率附加效率、38.0 dBm 的输出功率和 8.8 dB 的增益。