Lab5 - UNIVERSITY OF MIAMI Department of Electrical and...

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UNIVERSITY OF MIAMI Department of Electrical and Computer Engineering EEN 204 Name: ___________________ Section: ___________________ Date: ___________________ EXPERIMENT 5 LOWPASS AND HIGHPASS FILTERS Frequency Response of R-C circuits: Bode Diagrams PURPOSE: The purpose of this experiment is to introduce the student to two practical frequency discriminating circuits: the lowpass and the highpass filters. The lowpass filter lets pass frequencies below a certain cutoff ϖ c and rejects frequencies above it. The highpass filter performs the opposite task. The frequency band where signals pass through a filter is known as the passband and the region where they are attenuated or stopped is called the stopband . Since filters are not ideal, it takes a certain band for their gain to go from maximum to a level that can be considered negligible. This band is known as the transition band . Filters usually have relatively flat gains in the passband and decrease asymptotically at slopes of ±20 n dB/decade where n is the order of the filter. The frequency at which the gain is down by from the maximum value is called the 3 dB point. For a lowpass filter, the 3 dB point is the same as the bandwidth.
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