Design and Implementation of Active Filter for Data Acquisition System

Abstract

A filter is a device that passes electric signals at certain frequency or frequency ranges while preventing the passage of others. This paper focus on active low-pass Butterworth filters design. In communication, data acquisition system usually requires anti-aliasing low-pass filter as well as low-pass noise filter in their preceding signal condition stages. In this paper design of fourth-order low-pass filters is the main topic of consideration. This paper will examine how to implement Butterworth filter and design methods.