Topic
Butterworth filter
About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.
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04 Jul 2010
TL;DR: In this paper, the authors propose a filter topology and damping scheme based on the radiation coupling between on-board filters and the power supply of a power supply, as well as a common mode component selection.
Abstract: Filtering. Graphical attentuation calculations. Conduction modes. Filter load impedance and measurement techniques. Filter source impedance. Power supply. Filter/supply interaction. Filter topologies and damping. Common mode component selection. Radiation coupling to on-board filters.
190 citations
TL;DR: In this paper, a 0/spl deg/feed structure was proposed for a cross-coupled filter and a new lumped-circuit model for a coupled resonator filter was proposed to take into account the effects of this feed structure.
Abstract: The advantage of using a 0/spl deg/ feed structure in filter design is that two extra transmission zeros are created in the stopband while the passband response remains unchanged. This feed structure is analyzed by using transmission matrices. A new lumped-circuit model for a coupled resonator filter is then proposed to take into account the effects of this feed structure. Finally, the feed structure is applied to the design of a cross-coupled filter. All the theoretical analysis and design procedures have been successfully verified by experiment results.
190 citations
TL;DR: In this paper, a bandpass filter design method for suppressing spurious responses in the stopband by choosing the constitutive resonators with the same fundamental frequency, but staggered higher order resonant frequencies is proposed.
Abstract: This paper proposes a bandpass filter design method for suppressing spurious responses in the stopband by choosing the constitutive resonators with the same fundamental frequency, but staggered higher order resonant frequencies. The design concept is demonstrated by a four-pole parallel-coupled Chebyshev bandpass filter and a compact four-pole cross-coupled elliptic-type bandpass filter. Each filter is composed of four different stepped-impedance resonators (SIRs) for which a general design guideline has been provided in order to have the same fundamental frequency and different spurious frequencies by proper adjusting the impedance and length ratios of the SIR. Being based on knowledge of the coupling coefficients and following the traditional design procedure, the resultant filter structures are simple and easy to synthesize. The measured results are in good agreement with the simulated predictions, showing that better than -30-dB rejection levels in the stopband up to 5.4f/sub 0/ and 8.2f/sub 0/ are achieved by the Chebyshev and quasi-elliptic filters, respectively.
189 citations
TL;DR: Kernel estimates show a slightly elevated bias, but strongly reduced residual variance in the velocity and acceleration signals, and the overall smoothing behaviour of kernel estimates is better than butterworth filters and very similar to FIR filters, if their transition band is chosen appropriately.
188 citations
TL;DR: It is shown that a minimal volume can be found for a certain optimal number of filter stages and a volume optimization of the needed DM filter based on the previously calculated filter attenuation and volumetric component parameters is introduced.
Abstract: The design of electromagnetic interference (EMI) input filters, needed for switched power converters to fulfill the regulatory standards, is typically associated with high development effort. This paper presents a guideline for a simplified differential-mode (DM) filter design. First, a procedure to estimate the required filter attenuation based on the total input rms current using only a few equations is given. Second, a volume optimization of the needed DM filter based on the previously calculated filter attenuation and volumetric component parameters is introduced. It is shown that a minimal volume can be found for a certain optimal number of filter stages. The considerations are exemplified for two single-phase power factor correction converters operated in continuous and discontinuous conduction modes, respectively. Finally, EMI measurements done with a 300-W power converter prototype prove the proposed filter design method.
186 citations