Performance Analysis of Analog Butterworth Low Pass Filter as Compared to Chebyshev Type-I Filter, Chebyshev Type-II Filter and Elliptical Filter
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A signal is the entity that carries information. In the field of communication signal is the time varying quantity or functions of time and they are interrelated by a set of different equations, but some times processing of signal is corrupted due to adding some noise in the information signal and the information signal become noisy. It is very important to get the information from corrupted signal as we use filters. In this paper, Butterworth filter is designed for the signal analysis and also compared with other filters. It has maximally flat response in the pass band otherwise no ripples in the pass band. To meet the specification, 6th order Butterworth filter was chosen because it is flat in the pass band and has no amount of ripples in the stop band.Keywords:
Butterworth filter
Elliptic filter
SIGNAL (programming language)
Network synthesis filters
Voltage-controlled filter
This paper proposes the design of low pass Elliptic filter in fractional-order domain. By designing in fractional domain an extra degree of freedom has been achieved, which provides relationship between cutoff frequency and order of fractional filter. The effect of bandwidth on fractional order Elliptic filter is presented. The magnitude response of integer and fractional order Elliptic filter has been analyzed. Proposed design has inherent advantages as compared to Butterworth and Chebyshev filter in integer and fractional domain. The comparison of fractional order Chebyshev and Elliptic filter for same specifications has been presented. Numerical analysis is done using MATLAB.
Butterworth filter
Elliptic filter
Network synthesis filters
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An improved five-order active Butterworth filter is designed according to characteristics of input video signal.Sampling frequency is increased to reduce filter order,the group delay and the frequency characteristic of the filter are also adjusted,and quality of input video signal is improved.The reconstruction filter is built with specialized chip for filtering and driving of the output video signal.The fiber transmitting and processing terminal including improved filter and programmable controller is implemented.Simulation and experimental results show that the designed filter has the characteristics of flatter passband,bigger stop-band attenuation,and better group delay in the passband.
Butterworth filter
Elliptic filter
Passband
Voltage-controlled filter
Comb filter
All-pass filter
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A microwave filter is a two-port component usually employed when there is a need to control the frequency response at any given point in a microwave system. They provide transmission at certain frequencies, which are known as the passband frequencies, and attenuation at other frequencies, which are referred to as the stopband frequencies. The frequencies outside the passband are attenuated or reflected. Microwave filter is often named after the polynomial used to form its transfer function (i.e., Chebyshev, Butterworth [or maximally flat], Elliptical, etc.). The filter can be further sub-divided into four categorises (i.e., lowpass, highpass, bandstop, and bandpass filters) according to its frequency responses. This chapter gives a detailed discussion on filter classification and transfer function. It also covers the analysis, design, and implementation of a test microwave filter using the 21st century SIW transmission line. The simulation and measurement results of the test filter is also presented, compared, and discussed.
Butterworth filter
Elliptic filter
Passband
Voltage-controlled filter
Stopband
Electronic filter topology
Transition band
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One novel microwave bandpass filter is introduced in this paper.This filter,which is easy to be implemented physically,has the skirt selectivity intermediate between Chebyshev filters and the elliptic-function filters. The transfer function of the filter is given,by which this new filter is synthesized basing on the design parameters of Chebyshev filter. Then,its frequency response is analyzed using the general formulation for cross coupled resonator filters. This filter,implemented through microstrip open-loop resonators, has good linearity and high Q parameter as well as small size.
Butterworth filter
Electronic filter topology
Voltage-controlled filter
Elliptic filter
Network synthesis filters
Waveguide filter
Capacitor-input filter
Distributed element filter
Constant k filter
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Butterworth filter
Network synthesis filters
Voltage-controlled filter
Electronic filter topology
Analogue filter
Half-band filter
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A parallel doubly coupled stepped impedance resonators (SIRs) structure is proposed in this paper to build a 2.4/5.2 GHz dual-band bandpass filter for a WLAN application. The prototype filter is a three-stage design composed by four SIRs in conjunction with the tapped-line used in the I/O ports to create zeros by the passband skirts. The proposed filter has the advantages of a much wider fractional bandwidth in both the passbands without sacrificing the passband's insertion losses. The conventional parallel-coupled microstrip line model is applicable in the proposed filter design. The filter has obtained almost twice wider bandwidth compared to that possessed by the counterpart filter of a conventional parallel-coupled line configuration. It is convinced that this filter design can be apply to the 2.4/5-GHz dual-band operation that needs a wider second passband. The experiment is conducted for filter performance validation. A very good agreement is observed between the simulation and the measurements
Passband
Butterworth filter
Electronic filter topology
Elliptic filter
Voltage-controlled filter
Constant k filter
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Abstract This paper describes a current-mode elliptic filter structure based on dual-output OTAs and grounded capacitors. The filter is capable of producing both lowpass and highpass notch responses without changing the filter structure. This is achieved using a symmetrical current switching technique based on two switches controlled with a 2-bit digital word. The proposed filter structure forms a basic second-order building block in the design of high-order elliptic filters with tuneable frequency response. To confirm the theoretical analysis, simulated and measured results of fourth-order elliptic lowpass and highpass filters with tuneable bandwidth in the range of 0.65MHz to 1.3MHz are included. Finally, detailed analysis of the OTAs non-ideal parameters on the filter performance is presented and an example is given.
Elliptic filter
Mode (computer interface)
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For a switched-capacitor filter(SCF),it is important to configure its pre-filter and post-filter properly.There is a lack of systematic analysis and description for the problem.Based on the analysis of characteristics of SCF,a design method of pre-filter and post-filter for SCF was presented.Two design parameters of pre-filter and post-filter for SCF are cut-off frequency and attenuation.In designing a pre-filter or a post-filter,its attenuation should be determined according to system requirements first,and then its cut-off frequency should be determined according to the attenuation coefficient of a given filter structure.In this way,a programmable low-pass filter based on a MAX295 was designed for a 12-bit data acquisition system.The results show that the pre-filter and post-filter of the MAX295 could cover cut-off frequency range from 10Hz to 50kHz with 4 different cut-off frequencies,keeping minimum attenuation-74dB and-10dB respectively.
Butterworth filter
Voltage-controlled filter
All-pass filter
Capacitor-input filter
Constant k filter
Raised-cosine filter
Electronic filter topology
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A simple bandpass filter that approximates equal ripples in both the pass band and the stopband is described. The filter comprises two stubs, resonant at one-half and one-quarter of the centre frequency, respectively, and a series overlay capacitor. The filter has a performance comparable to that of a third-order elliptic function filter and has a practical bandwidth of 16–34%.
Elliptic filter
Voltage-controlled filter
Butterworth filter
Electronic filter topology
Stopband
Elliptic function
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A systematic synthesis approach for designing a voltage-mode multifunction operational transconductance amplifier (OTA)-C biquadratic has been described using programmable first order filter. The proposed filter shows lower sensitivities, high frequency response, lower output noise. The proposed second order filter has been converted to third order butterworth and elliptic filter employing a single capacitor. Hierarchical analysis has been maintained through the synthesis of higher order band pass filter (BPF) and high pass filter (HPF) using the proposed biquadratic. All the proposed theory are validated with SPICE simulations.
Butterworth filter
Voltage-controlled filter
All-pass filter
Elliptic filter
Spice
Electronic filter topology
Transconductance
Operational transconductance amplifier
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