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本文提出了一种200MHz带宽的阻隔容忍接收机，采用五阶滤波结构实现陡峭的基带阻抗滚降，以应对5G NR宽带信号下的强邻道阻塞。该接收机实现了19dBm的邻道IIP3，显著提升了线性度。
The fifth-generation (5G) New-Radio (NR) standard has been developed for high data-rate communication, with the RF channel bandwidth (BW) extending to several hundred megahertz. In this context, the presence of blockers imposes stringent in-band (IB) and adjacent-channel linearity requirements for receivers (RX). Mixer-first RXs [1-4] have attempted to address these challenges by implementing a baseband (BB) input impedance (ZBB) with a steep roll-off greater than the conventional 20dB/dec, resulting in sharp nearby filtering at RX input. Though a passive gain through capacitor stacking can be achieved [4], the trade-off between noise figure (NF) and power consumption (PDC) remains an issue in mixer-first RXs. Moreover, the attempts to improve adjacent-channel linearity typically result in increased PDC without contribution to far-out blocker suppression, degrading power efficiency [1,3,4].
Liangbo Lei, Yanxiang Chen, Yijie Li, Zhiliang Hong, Yumei Huang
Fudan University, Shanghai, China