ECEN 215, Principles of Electrical EngineeringDr. Mina RahimianLecture# 18 Date: 10/28/13First order RC low pass filtersA low pass filter tends to pass the low frequency components and reject the high frequency components.First order RL low pass filtersDecibels and logarithmic scalesThe magnitude of transfer function is usually expressed in logarithmic scale or decibles.Cascaded networkWhen the output of one system having transfer function H1 is connected to the input of another system with transfer function H2, the transfer function of the two system combined is H= H1 H2.Bode plotBode plot is a plot of the magnitude of the transfer function in decibels and the phase of the transfer function in degrees, versus ferquency in logarithmic scale on a semilog graph.Bode plots can often be approximated by straight lines and are easy to draw.Bode plot of the first order low pass
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