A novel method for guaranteed overflow oscillation elimination in digital filters subject to quantization

Muhammad Rehan, Muhammad Bilal Mobeen, Muhammad Tufail, Choon Ki Ahn

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

This paper provides a novel criterion for the analysis of convergence of states of an infinite impulse response (IIR) digital filter to a bounded region under the influence of composite effects of quantization and overflow nonlinearities. The developed criterion is less conservative in its approach in terms of analysing stability than conventional methods and can be employed for implementation of an IIR filter on comparatively smaller hardware word-length than existing methods. The conventional approaches consider asymptotic stability of a filter with respect to the quantization noise; however, quantization in digital filters can result into bounded oscillation and lead to infeasibility of the asymptotic stability. Therefore, a less conservative stability analysis together with estimation of steady-state region of convergence for an IIR filter is provided. In addition, the conventional approaches, analysing stability and steady-state region of convergence, may not guarantee an overflow oscillation-free realization of a filter. Consequently, a condition for estimating the steady-state region of convergence (along with the filter stability) with an additional constraint that the filter’s state should not overflow in the bounded region has been derived. A comparative analysis with conventional methods is provided in simulation results.

Original languageEnglish
JournalIEEE Transactions on Circuits and Systems II: Express Briefs
DOIs
Publication statusAccepted/In press - 2018 Feb 27

Keywords

  • Asymptotic stability
  • Circuit stability
  • external interferences.
  • fixed point arithmetic
  • Hardware
  • limit cycle elimination
  • Oscillators
  • Quantization
  • Quantization (signal)
  • saturation overflow
  • Stability criteria

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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