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该论文提出了一种8路径可调射频陷波滤波器，用于抑制强干扰信号，解决多频段、软件定义或认知无线电收发器中固定滤波器无法调谐的问题。通过频率转换滤波技术，实现了高Q值和可调谐性，有效抑制0dBm级别的阻塞信号。
The huge growth of the number of wireless devices makes wireless coexistence an increasingly relevant issue. If radios operate in close proximity, blockers as strong as 0dBm may occur, driving almost any receiver in compression (note that 0dBm in 50Ω corresponds to a peak-to-peak voltage of half a 1.2V supply). Thus RF blocker filtering is highly wanted. However, fixed filters are undesired when aiming for multiband, software-defined or cognitive radio transceivers. Passive LC filters show limited Q and tunability. Recently frequency translated filtering has been proposed as a potential solution direction for high-Q filtering [1-5]. In [1,2] we showed that by applying the “N-path concept” [6], more than a decade of center frequency range with good linearity, compression point (P1dB>0dBm, IIP3 >14dBm) and low noise is feasible for a bandpass (BP) filter. In [3] a notch filter with a combination of active and passive mixers is applied in
Amir Ghaffari, Eric Klumperink, Bram Nauta
University of Twente, Enschede, The Netherlands