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Analysis of the effects of clock imperfections in N-path filters
Nikoofard, A ; Sharif University of Technology | 2015
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- Type of Document: Article
- DOI: 10.1109/NEWCAS.2015.7182093
- Publisher: Institute of Electrical and Electronics Engineers Inc , 2015
- Abstract:
- In this paper, the effect of imperfections on the behavior of N-path filters is investigated. Exact mathematical derivations are presented which describe the effect of clock skew and finite fall/rise time on the impedance transformation behavior of N-path filters. In the ideal case, the N-path filter is supposed to provide a short-circuit to the ground for undesired frequency contents and an open-circuit for the desired signal so that it lies within the passband of the filter. It is shown that clock skew and finite clock fall/rise time result in a non-zero impedance for frequency contents other than the clock frequency and a smaller impedance for the desired voltage. In a real circuit with these effects present, the performance and filtering characteristics of the filter are altered. Finally, a technique has been introduced by means of which a specific harmonic fold-back component can be canceled by proper choice of clock timing
- Keywords:
- N-path Filters ; Non-overlapping clock generation ; Electric clocks ; Mathematical transformations ; Switched filters ; Clock generation ; Clock skews ; Filtering characteristic ; Finite Fall/Rise time ; Harmonic fold-back (HFB) ; Impedance transformation ; Mathematical derivation ; Specific harmonics ; Clocks
- Source: Conference Proceedings - 13th IEEE International NEW Circuits and Systems Conference, NEWCAS 2015, 7 June 2015 through 10 June 2015 ; June , 2015 , Page(s): 1 - 4 ; 9781479988938 (ISBN)
- URL: http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=7182093