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Design and Analysis of Enhanced Mixer-First Receivers Achieving 40-dB-decade RF
提出二阶无源混频优先接收器，提升信道选择性、线性度和噪声性能。
28nm CMOS, OOB IIP3 +33 dBm, 阻塞P1dB +12 dBm, NF 4.4 dB
混频优先接收器N路径滤波器线性度噪声系数CMOS
▸40 dB/decade阻抗滚降设计
▸宽带操作（0.2-2 GHz）
▸高线性度（OOB IIP3 +33 dBm）
Abstract
A “second-order” passive mixer-first receiver is
proposed to improve channel selectivity, linearity, and noise
figure (NF) in the presence of out-of-band blockers, by presenting
an impedance that rolls off at 40 dB/decade as the load to an
N-path filter. The synthesis of this impedance is described in
a step-by-step manner starting from the required impedance
transfer function to its actual circuit realization. Various tradeoffs
and limitations of the architecture are described in detail,
and layou