{"title":"A distinct operation frequency cascaded N-path filter with improved harmonic rejection ability","authors":"Takahide Sato, Ong Zi Hao, S. Kasai","doi":"10.1109/ISPACS.2016.7824724","DOIUrl":null,"url":null,"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.","PeriodicalId":131543,"journal":{"name":"2016 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"2016-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"2016 International Symposium on Intelligent Signal Processing and Communication Systems (ISPACS)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/ISPACS.2016.7824724","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
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.