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本文提出一种24-29GHz紧凑型收发前端模块，采用非对称Doherty功率放大器，在0.22mm2面积内实现高线性高效率发射和低噪声接收，解决了毫米波波束赋形器中前端模块面积与性能的权衡问题。
*Equally Credited Authors (ECAs) The performance of mm-wave beamformers is largely determined by the front-end module (FEM), which integrates a power amplifier (PA), a low-noise amplifier (LNA), and a transmit/receive (T/R) switch. An ideal FEM should deliver high linearity and high efficiency in the transmit (TX) mode, while maintaining a low noise figure (NF) in the receive (RX) mode. Moreover, the FEM needs to be compact, as it dominates the overall size of beamformers. Most existing 28GHz FEMs adopt linear Class-AB PAs [1-6]. While these FEMs occupy a compact footprint, as small as 0.2mm2 in [1] (Fig. 26.4.1, top left), their TX average efficiency (PAEavg) is below 10% under 5G NR OFDM signals [1-6], which have a high peak-to-average-power ratio (PAPR) of ~10dB. Doherty PAs have gained significant interest at mm-wave frequencies in recent years [7-17], as they offer enhanced back-off efficiency with minimal baseband overhead.
Xiaohan Zhang*, Ruizhe Wang*, Qiang Zhou*, Hao Guo, Chuan Shi, Taiyun Chi
Rice University, Houston, TX