Insertion loss filter design is based on the specification of an approximation network response in the form of a transfer function part, such as transfer function magnitude or phase and the synthesis of a lumped network to achieve the specified response. This type of filter design was a marked impetus by the work of zobel in 1923 on m – derived filters and was dominant for more than 30 years. The design of image parameter filters is based on the concepts of a cascade of fundamental sections with matched image impedance. The first of these has been called image parameter filter design, and the second is often referred to as insertion loss filter design. The continuation of this has proceeded along two paths. The basic concept of filter was originated by Campbell and Wagner, working independently, in 1915. Several technologies achievement would not have been possible without electrical filter, much effort has been expanded on the theory, design and construction of filters and many articles and books has been written. 1.0 INTRODUCTION The concept of filter has been an integral part of evolution of electrical engineering from the beginning. The filter simulation is carried out with the aid of MATLAB filter design toolbox and MATLAB scripts are generated for the filter characteristics. The ideal filter is impossible to achieve with active RC filters and so the transfer function of the filter is approximated by Butterworth approximation. This filter is realized by cascading one first order and one second order together and coefficient matching method is used to obtain the component values by comparing the general transfer with the realized circuit's transfer function. The paper presents design, construction and simulation of an experimental module suitable for investigating the frequency response (magnitude and phase plot) of third order Butterworth high-pass active RC filter with a cutoff frequency of 800Hz unity gain in the passband.
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