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该论文提出了一种0.3至1.2GHz可调谐的4阶开关gm-C带通滤波器，用于替代可重构接收机中笨重且不可调谐的SAW/BAW滤波器。通过开关gm-C技术实现了>55dB的最终抑制和+2dBm的带外IIP3，解决了片上滤波器调谐范围有限和线性度不足的问题。
The trend towards reconfigurable receivers requires on-chip flexible filters that can replace dedicated, bulky and non-tunable filters (e.g., SAW and BAW [1]). Although BAW filters are compatible with silicon processes, their center frequency is sensitive to thickness variation of the piezoelectric material and the achievable tuneability is limited [1]. Other techniques to make RF on-chip band-pass filters (BPFs) include Q-enhancement, gm-C and N-path. Q-enhancement approach has several disadvantages such as large area due to inductors which do not obey process scaling, limited tuneability and poor dynamic range [2]. Main drawbacks of gm-C filters are the tradeoff between power consumption, quality factor, center frequency and dynamic range and the need for tuning circuitry [3]. Recently there has been renewed interest in the translational impedance conversion of N-path filters [4-6]. Due to the “transparency” of the passive
Milad Darvishi, Ronan Van der Zee, Eric Klumperink, Bram Nauta
University of Twente, Enschede, The Netherlands