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A filter is a device that passes electric signals at certain frequency or frequency ranges while preventing the passage of others. This paper focuses 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. And this paper describes mathematics calculations and implementation of Butterworth filter with MATLAB and Circuit Maker.
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