Research on the Passive and Active Low Pass Filters

Abstract

The goal of this paper is to demonstrate how to use Resistor-Capacitance circuit to build a low pass filter. One of the reasons for choosing to use the Butterworth filter was that it is characterized by a flat peak frequency response curve with no bandpass fluctuations and a gradual decay to zero in the stopband. It could also retain the same form regardless of orders or amplitudes. The low-pass filter is tuned to the RC circuit because its cutoff frequency is limited and the resistor's volume is smaller in this case. The authors realized that in the low-pass filter with operational amplifier and analog multiplier. To overcome the limitation and tackle the wave clipping problem, a negative feedback loop was introduced. On the output side, the authors also carry out research on latency reduction and make some progress. An operational amplifier was used to isolate the inputs from the outputs. In addition, the author reduced its latency and discussed its electrical principles.