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本文提出了一款6GHz正交数字发射机（DTX），支持1GHz信号带宽，在28nm CMOS工艺中实现。通过优化静态和动态非线性，该发射机实现了23.1dBm峰值输出功率、30.3%峰值PAE，以及-40.8dB的EVM底噪和>55dB的动态范围，解决了宽带数字发射机中线性度与效率的权衡问题。
*Equally Credited Authors (ECAs) Abstract A 6GHz quadrature DTX supporting a 1GHz signal bandwidth is presented in 28nm CMOS, where static and dynamic nonlinearities are carefully optimized. Occupying a core area of 0.67mm2 and packaged in a fanout SiP, the DTX delivers 23.1dBm peak output power with a 30.3% peak PAE at 6.0GHz, and the 1dB RF bandwidth is from 5.7 to 6.5GHz. For 1GHz 64-QAM signals, it achieves 18.0dBm Pavg and 16.2% PAEavg with -25.5dB EVM. The dynamic power range is >55dB, and its EVM floor is -40.8dB. Beyond the sub-6GHz band, the 6-to-7GHz frequency band has gained much attention and adoption for supporting signal bandwidths (BWs) up to 200 to 400MHz in applications such as 3GPP U6G and 802.11be. However, the high modulation order with stringent linearity requirements and low power efficiency at power backoff (PBO) are main design challenges for transmitters (TXs). Analog TXs [1-3] offer good linearity but normally consume much
Yicheng Li*, Feng Xie*, Yun Yin, Lixuan Cao, Tianze Yang, Jiaxiang Li, Hongtao Xu
Fudan University, Shanghai, China