Design and Construction of Low- and High-Pass Active Filters Using Butterworth and Chebychev Techniques.
O. A. Aremu, Ile Ife · 2013
A filter is a device that passes electric signals at certain frequency. In the communication system, it is essential to extract or enhance the useful information and remove any redundancy from a mix of conflicting information. In this paper, design and construction of low-pass and highpass active filters using Butterworth and Chebychev techniques is presented. The gain and the frequencies of the device constructed were measured using oscilloscope and signal generator, respectively. The work shows the characteristics of each filter for a particular frequency specification. The tables for designing filters were presented and the equivalent circuit diagram was drawn. In this work, low pass Butterworth and Chebychev filters was designed to pass frequency from 0-1000Hz while the frequency above 1000Hz is attenuated. High pass Butterworth and Chebychev filters were also design to pass frequency from 100-5000Hz while the frequency below 100Hz is attenuated. The result shows that Butterworth filters produce no ripple in the pass band and attenuate unwanted frequencies outside the band based on the specification while Chebychev filters attenuate unwanted frequencies with fewer components than Butterworth filters, but exhibit ripples in the pass band.