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A very-strict passivity condition is proposed for the digital filters by using an appropriate Lyapunov-Krasovskii functional. The established criterion ensures limit-cycle free realization of state-delayed interfered digital filters using saturation arithmetic. Conditions for passivity, input-strict passivity and output-strict passivity of the digital filters are obtained as special cases of the proposed result. In addition, an asymptotic stability condition for the digital filters with zero external interference is presented. It is also demonstrated that a stability condition reported in a recent work may be recovered from the established criterion. Numerical simulations are given to demonstrate worthiness of the proposed results. <\/jats:p>","DOI":"10.1177\/0142331220932388","type":"journal-article","created":{"date-parts":[[2020,7,3]],"date-time":"2020-07-03T05:52:05Z","timestamp":1593755525000},"page":"2559-2568","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":8,"title":["Stability of digital filters subject to external interference and state-delay"],"prefix":"10.1177","volume":"42","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6248-4627","authenticated-orcid":false,"given":"Priyanka","family":"Kokil","sequence":"first","affiliation":[{"name":"Department of Electronics and Communication Engineering, Indian Institute of Information Technology, Design and Manufacturing, Kancheepuram, Chennai, India"}]},{"given":"CG","family":"Parthipan","sequence":"additional","affiliation":[{"name":"Department of Electronics and Communication Engineering, Indian 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