基于采样计算的差分N通道滤波器

doi:10.16088/j.issn.1001-6600.2021101102

Abstract

Abstract: To solve the problems of harmonic selectivity (HS) and harmonic foldback (HFB) in traditional N-path filters, this paper proposes a differential N-path filter based on sampling calculation. Through this method, the proposed filter can not only suppress the even harmonics and the third and the fifth harmonics, but also solve the problem of harmonic foldback without increasing the input reference clock frequency. The simulation results show that the filter has a harmonic suppression of 49 dB and 67 dB at the 3rd and 5th harmonics, respectively. The circuit center frequency f_s can be adjusted from 0.3-1.0 GHz, and the total power consumption is 25.2 mW. Input return loss S₁₁<-10 dB, and noise factor (NF) is3.1-5.8 dB.

Key words: N-path filter, mixer, harmonic suppression, harmonic foldback, differential structure

CLC Number:

TN713

ZHONG Hui, SONG Shuxiang, CEN Mingcan, CAI Chaobo, JIANG Pinqun, LIU Zhenyu. Differential N-path Filter Based on Sampling Calculation[J].Journal of Guangxi Normal University(Natural Science Edition), 2022, 40(4): 58-67.

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