Topic
Bessel filter
About: Bessel filter is a research topic. Over the lifetime, 656 publications have been published within this topic receiving 16808 citations.
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a Maple implementation of two distinct approaches to Laplace's method used to obtain asymptotic expansions of Laplace-type integrals was examined, one algorithm uses power series reversion, whereas the other expands all quantities in Taylor or Puiseux series.
14 citations
14 citations
TL;DR: In this paper, simple approximations to the Bessel functions can be employed, to accurately model the oscillatory behavior of Bessel function integral for both small and intermediate-sized loop antennas.
Abstract: The purpose of this article is to derive approximate formulas for the radiation resistance (R), and the directivity (D) of circular loop antennas. It is shown that simple approximations to the Bessel functions can be employed, to accurately model the oscillatory behavior of the Bessel function integral for both small and intermediate-sized loop antennas. Furthermore, when these approximations are combined with the usual asymptotic contributions to the integral in the case of a large input parameter ka (a=loop radius, a=2/spl pi///spl lambda/) accurate and relatively simple results for R and D can be secured for all loop sizes. Numerical results can, if necessary, be obtained using a simple pocket calculator. >
14 citations
TL;DR: In this article, an elementary proof of an identity of Calogero concerning the zeros of Bessel functions of the first kind is presented, which in particular reduces to some other new identities.
14 citations
01 Dec 2009
TL;DR: This paper investigates in detail the performance of a 3rd-order Sinh CMOS 8Hz low-pass filter of Bessel approximation suitable for ECG processing and presents the transistorlevel synthesis of this filter.
Abstract: Hyperbolic sine (Sinh) CMOS filters are of inherent class-AB nature and offer high dynamic range at half the total capacitance value when compared against their pseudodifferential class-AB log-domain counterparts. This characteristic renders their theoretical and practical study valuable. Only a very limited number of CMOS Sinh filter topologies have been reported in the literature to date mostly due to the considerably increased mathematical complexity associated with their design. This paper presents the transistorlevel synthesis and investigates in detail the performance of a 3rd-order Sinh CMOS 8Hz low-pass filter of Bessel approximation suitable for ECG processing. The filter is based on recent progress made and has been designed in the commercially available 0.35µm AMS process. Its static power consumption amounts to 0.1µW while its dynamic range exceeds 110dBs. The new filter exhibits a flat group delay of less than 1% error up to 6Hz and good variability performance verified by means of Monte Carlo simulations. The suitability of the filter as part of an ECG front-end is confirmed by the processing of artificially generated ECG signals contaminated by various simulated noise sources and fed as signal inputs into the Cadence Design Framework.
14 citations