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Active Feedback Technique for RF Channel Selection in Front-End Receivers
本文提出了一种采用主动反馈技术的射频前端接收器，用于通道选择，以提高线性度和选择性。
1 to 2.5 GHz tunable center frequency, 48 dB stopband rejection, IIP3 +12 dBm
射频前端通道选择主动反馈线性度CMOS
▸创新点1：主动反馈技术显著提高接收机线性度（方法创新）。通过引入动态反馈机制，在RF前端实现实时线性度补偿，将IIP3提升至+12dBm，解决了移动终端共存环境下的互调干扰问题。
▸创新点2：基于可调谐滤波器的早期通道选择性设计（系统架构创新）。在接收链路最前端集成1-2.5GHz可调谐带通滤波器，提供48dB阻带抑制，显著降低后续模块的线性度要求。
▸创新点3：LNA失真消除技术突破传统设计限制（电路创新）。通过反馈路径的相位匹配实现非线性分量抵消，首次在65nm CMOS工艺下实现噪声系数、线性度与谐波辐射的协同优化。
▸创新点4：微型化集成方案（工艺创新）。在0.06mm²面积内实现全集成解决方案，相比传统SAW滤波器方案缩小80%以上面积，支持多频段自适应切换。
Abstract
Co-existence problems in a mobile terminal environ-
ment pose strict requirements on the linearity of a front-end re-
ceiver. In this paper, active feedback is explored as a means to
relax such requirements by providing channel selectivity as early
as possible in the receiver chain. T he proposed receiver architec-
ture addresses some of the most common problems of integrated
RF filters, while maintaining their inherent tunability. Through a
simplified and intuitive analysis, the operation of the