Butterworth filter

About: Butterworth filter is a research topic. Over the lifetime, 6187 publications have been published within this topic receiving 69070 citations.

Component value selection for analog active filter using particle swarm optimization

Abstract: In this work, a PSO based component value selection method is proposed for analog active filter. PSO is an efficient intelligent evolutionary algorithm for solving optimization problems. The aim of this work is to minimize the total design error of a 4th order Butterworth low pass active filter that would be realized with component values which are compatible with E12 series. PSO provides a maximally flat response in the pass band and achieves smaller design error compared with previous methods.

Design of new selective CIC filter functions with passband-droop compensation

Abstract: The main aim of this reported work was to design new selective cascaded-integrator-comb (CIC) filter functions. The theoretical design equations and impulse response coefficients, as well as the frequency response characteristics of the novel filter functions are presented. Compared with existing filter functions in the literature, the proposed functions not only have improved insertion loss but also a multiplierless architecture, better passband characteristics and lower impulse response coefficients.

Electronically tunable current-mode biquad filter employing CCCDTAs and grounded capacitors with low input and high output impedance

Abstract: In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current controlled current differencing transconductance amplifier (CCCDTA) is presented. The proposed filter uses two CCCDTAs and two grounded capacitors without any external resistors, which is well suited for integrated circuit implementation. The filter simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of IHP and LLP, the notch filter can be also achieved. Moreover, the circuit has low input and high output impedance which would be an ideal choice for cascading in current-mode circuit. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.

On design of two-stage CIC compensation filter

Abstract: This paper presents the compensation filter design for the two-stage CIC decimation filter. The goal is twofold: to avoid the integrator section at high input rate and obtain a low wideband passband droop of the overall filter. To this end the decimation is split into two stages with the cascaded less order RRS filters at each stage. The first stage can be implemented either in non recursive form or using the polyphase decomposition. The simple compensation filter and the sharpening are applied to the second section where RRS filter is implemented as a CIC filter. The resulting structure is a multiplierless and with no integrators at high input rate. Additionally, the structure exhibits a low passband droop and a high stopband attenuation.

K-Band Frequency Tunable Substrate-Integrated- Waveguide Resonator Filter With Enhanced Stopband Attenuation

Abstract: In this paper, we present a K-band substrate-integrated waveguide resonator bandpass filter structure. The filter uses an antisymmetric mode of the resonator for the first time. A design method for the external coupling structure of the resonator utilizing the antisymmetric mode is described. In addition, a methodology for suppressing neighboring resonances close to the passband is demonstrated. This method can enhance stopband attenuation performance without additional loss. The proposed filter can tune the center frequency by adjusting tuning components. In order to verify the proposed filter structure and design method, we have fabricated and measured a K-band filter and demonstrated higher order filter design.