Design of active filters independent of first-and second-order operational amplifier time constant effects

1981 ◽  
Vol 28 (8) ◽  
pp. 749-757 ◽  
Author(s):  
R. Geiger ◽  
A. Budak
Keyword(s):  
Time Constant ◽  
Operational Amplifier ◽  
Second Order ◽  
Active Filters

scholarly journals SENSITIVITY ANALYSIS OF THE BARBER FILTERS

2017 ◽  
Vol 27 (1-2) ◽  
Author(s):  
Gordana Lukić
Keyword(s):  
Sensitivity Analysis ◽  
Transfer Function ◽  
Time Constant ◽  
Moving Objects ◽  
Bandpass Filters ◽  
Second Order ◽  
Active Filters ◽  
Low Sensitivity

A b s t r a c t: The sensitivity of different Barber filters is investigated. It has been found that the sensitivity depends on the orders of the filters and on the types of the applied approximations. The sensitivity of the Barber filters does not change essentially by increasing the order of the filter, as is shown in the paper. A comparison between the sensitivity of traditional active filters of the second order and Barber filters of the second order is presented. Taken into consideration is the transfer function sensitivity with respect to time constant T because the value of the time constant is the most unstable quantity. The advantage of the Barber filters is obvious in sensitivity, especially for Barber bandpass filters. Because of their low sensitivity Barber filters are very suitable to use in moving objects, like aeroplanes, satellites and rockets.

Design, Simulation And Theoretical Analysis Of Butterworth And Chebyshev Second Order Active Filters

2005 ◽  
Author(s):  
A. M. Swidan ◽  
S. M. El‐Ghanam ◽  
H. A. Ashry ◽  
F. A. S. Soliman ◽  
W. Abdel‐Basit
Keyword(s):  
Theoretical Analysis ◽  
Second Order ◽  
Active Filters

On-Line Analysis of Exponential Time Functions

1972 ◽  
Vol 5 (2) ◽  
pp. 53-57
Author(s):  
J O Gray ◽  
J P Palmer
Keyword(s):  
Time Constant ◽  
Second Order ◽  
Time Function ◽  
Experimental Results ◽  
Exponential Time ◽  
Signal Noise ◽  
On Line ◽  
Hybrid Computer ◽  
Line Analysis

A hybrid computer configuration has been devised for the fast on-line estimation of the parameters of a second order exponential time function. Experimental results are given for a range of time constant ratios and the effect of signal noise is considered.

Design conditions for second order oscillators using a single operational amplifier

1991 ◽  
Vol 70 (1) ◽  
pp. 165-170 ◽  
Author(s):  
P. MARTÍNEZ ◽  
A. CARLOSENA ◽  
S. CELMA ◽  
S. PORTA
Keyword(s):  
Operational Amplifier ◽  
Second Order

scholarly journals High-Frequency Sections of Active Filters of Mixed-Signal SoC Based on Current Amplifiers

2012 ◽  
Vol 2012 ◽  
pp. 1-6 ◽  
Author(s):  
Sergei Krutchinsky ◽  
Nikolai Prokopenko
Keyword(s):  
High Frequency ◽  
Sufficient Conditions ◽  
Basic Structure ◽  
Second Order ◽  
Active Filters ◽  
Order Unit ◽  
Mixed Signal ◽  
Active Elements

The sufficient conditions for the efficient use of active elements are formulated by analyzing the basic structure of second-order unit. The expediency of current amplifiers usage in HF and SHF filters is shown. The examples of a methodical nature are given and conclusions of application importance are formulated.

scholarly journals Applying Genetic Algorithm to Optimization Second-Order Bandpass MGMFB Filter

2020 ◽  
Vol 28 (4) ◽  
Author(s):  
Maad Mohsin Mijwil ◽  
Rana Ali Abttan
Keyword(s):  
Genetic Algorithm ◽  
Optimization Problem ◽  
Optimization Methods ◽  
Second Order ◽  
Active Filters ◽  
Multi Objective Optimization ◽  
Complex Situation ◽  
Human Effort ◽  
True Values ◽  
Selection Of

In this paper, we have applied the genetic algorithm to the selection of the true values for RC (resistors/capacitors) as an essential role in the development of analogue active filters. The classic method of incorporating passive elements is a complex situation and can attend to errors. In order to reduce the frequency of errors and the human effort, evolutionary optimization methods are employed to select the RC values. In this study, Genetic algorithm (GA) is proposed to optimize the second-order active filter. It must find the values of the passive elements RC to get a filter configuration that reduces the sensitivities to variations as well as reduces design errors less than a defined height value, concerning certain specifications. The optimization problem which is one of the problems that must be solved by GA is a multi-objective optimization problem (MOOP). GA was carried out taking into account two possible situations about the values that resistors and capacitors could adopt. The obtained experimental results show that GA can be used to obtain filter configurations that meet the specified standard.

scholarly journals Validation of Fractional-Order Lowpass Elliptic Responses of (1 + α)-Order Analog Filters

2018 ◽  
Vol 8 (12) ◽  
pp. 2603 ◽  
Author(s):  
David Kubanek ◽  
Todd Freeborn ◽  
Jaroslav Koton ◽  
Jan Dvorak
Keyword(s):  
Transfer Function ◽  
Least Squares ◽  
Fractional Order ◽  
Frequency Band ◽  
Operational Amplifier ◽  
Transfer Functions ◽  
Second Order ◽  
Experimental Results ◽  
Analog Filters ◽  
Lowpass Filter

In this paper, fractional-order transfer functions to approximate the passband and stopband ripple characteristics of a second-order elliptic lowpass filter are designed and validated. The necessary coefficients for these transfer functions are determined through the application of a least squares fitting process. These fittings are applied to symmetrical and asymmetrical frequency ranges to evaluate how the selected approximated frequency band impacts the determined coefficients using this process and the transfer function magnitude characteristics. MATLAB simulations of ( 1 + α ) order lowpass magnitude responses are given as examples with fractional steps from α = 0.1 to α = 0.9 and compared to the second-order elliptic response. Further, MATLAB simulations of the ( 1 + α ) = 1.25 and 1.75 using all sets of coefficients are given as examples to highlight their differences. Finally, the fractional-order filter responses were validated using both SPICE simulations and experimental results using two operational amplifier topologies realized with approximated fractional-order capacitors for ( 1 + α ) = 1.2 and 1.8 order filters.

Second-order Q and ω0 shifts in RC active filters having nonideal amplifiers

1982 ◽  
Vol 18 (9) ◽  
pp. 365 ◽  
Author(s):  
R. Moon ◽  
F.W. Stephenson
Keyword(s):  
Second Order ◽  
Active Filters
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