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该论文提出了一种基于N-path结构的可调谐6阶信道选择滤波器，工作频率范围为0.1-1.2GHz，实现了0.6dB的低通带纹波和+7dBm的高阻塞容限。解决了传统gm-C滤波器在动态范围、功耗、品质因数和中心频率之间的严格折衷问题，适用于鲁棒的无线接收机。
Radio receivers should be robust to large out-of-band blockers with small degradation in their sensitivity. N-path mixers can be used as mixer-first receivers [1] with good linearity and RF filtering [2]. However, 1/f noise calls for large active device sizes for IF circuits and high power consumption. The 1/f noise issue can be relaxed by having RF gain. However, to avoid desensitization by large out-ofband blockers, a bandpass filter (BPF) with sharp cut-off frequency is required in front of the RF amplifiers. gm-C BPFs suffer from tight tradeoffs among DR, power consumption, Q and fc. Also, on-chip Q-enhanced LC BPFs [3] are not suitable due to low DR, large area and non-tunability. Therefore, bulky and nontunable SAW filters are used. N-path BPFs offer high Q while their center frequency is tuned by the clock frequency [2]. Compared to gm-C filters, this technique decouples the required Q from the DR. The 4-path filter in [4] has only 2ndorder filtering and limited rejection. The o
Milad Darvishi, Ronan van der Zee, Bram Nauta
University of Twente, Enschede, The Netherlands