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该论文提出了一种用于蜂窝NB-IoT应用的紧凑型双频数字Doherty功率放大器，采用并联组合变压器架构，解决了在低频段（699-915MHz）和高频段（1710-1980MHz）同时实现高功率、高效率输出的问题。
Narrowband Internet-of-Things (NB-IoT) is a newly developed 3GPP protocol optimized for low-power wide-area IoT applications and is evolving toward the future fifth-generation (5G) mobile communication. It specifies at least 23dBm maximum output power for long-range communication, stringent emission mask compatible with guard-band or in-band scenarios, and it supports multiple operation bands from 699 to 915MHz (LB) and from 1710 to 1980MHz (HB). For cost reduction, longer battery life, and fast time to market, the integration of highpower high-efficiency power amplifiers (PAs) on-chip is greatly demanded. To benefit from advanced CMOS technology, the digital polar transmitter has become a very attractive architecture for NB-IoT applications [1]. To simultaneously support dual bands for user flexibility, the traditional solution is to implement two separately optimized PAs [2], which requires extra design effort and increases
Yun Yin, Liang Xiong, Yiting Zhu, Bowen Chen, Hao Min, Hongtao Xu
Fudan University, Shanghai, China