A distinct operation frequency cascaded N-path filter with improved harmonic rejection ability

Takahide Sato, Ong Zi Hao, S. Kasai
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引用次数: 1

Abstract

A cascaded differential 20-path and 3-path filter which realizes a more than 20 dB stopband rejection and harmonic rejection ability is proposed. Compared to a differential N-path filters with a passive low-pass filter connected between the signal source and the filter itself, the proposed cascaded N-path filter provides better flexibility in tuning and narrower full width half maximum (FWHM) value for higher frequency selectivity. The first stage 20-path filter which acts as a tunable low frequency band-pass filter operating at one third of switching frequency of second stage N-path filter, attenuating the undesirable high frequency signals. The second stage 3-path filter then filters off the remaining standards providing sufficient stopband rejection for the whole system. The different operating frequencies for both stages provides a harmonic rejection ability as the high frequency components causing the harmonic folding of second stage frequency are first removed before passing through the second stage N-path filter for a desirable standard.
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不同的工作频率级联n路滤波器,提高谐波抑制能力
提出了一种级联的20路和3路差分滤波器,实现了20 dB以上的阻带抑制和谐波抑制能力。与信号源和滤波器之间连接无源低通滤波器的差分n路滤波器相比,所提出的级联n路滤波器具有更好的调谐灵活性和更窄的全宽半最大值(FWHM)值,具有更高的频率选择性。第一级20路滤波器作为可调低频带通滤波器,以第二级n路滤波器开关频率的三分之一工作,衰减不需要的高频信号。第二级3路滤波器然后滤除剩余的标准,为整个系统提供足够的阻带抑制。两级的不同工作频率提供了谐波抑制能力,因为引起第二级频率谐波折叠的高频成分在通过第二级n路滤波器之前首先被去除。
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