3-Lesson_Notes_Lecture29_ee205 - EE 205 Dr. A. Zidouri- 1-...

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Unformatted text preview: EE 205 Dr. A. Zidouri- 1- Electric Circuits II Frequency Selective Circuits (Filters) Bandstop Filters Lecture #29 EE 205 Dr. A. Zidouri- 2- The material to be covered in this lecture is as follows: o Introduction to Bandstop filters o Center Frequency, Bandwidth and Quality factor o Bandstop Series RLC Circuit Analysis o Relationship between different parameters After finishing this lecture you should be able to: ¾ Understand the behavior of Bandstop filters ¾ Determine the different Bandstop filter parameters ¾ Relate each parameter in terms of other parameters ¾ Analyze Bandstop filters ¾ Design a simple Bandstop filter EE 205 Dr. A. Zidouri- 3- Introduction to Bandstop filters Bandstop filters are those that pass voltages outside the band between the two cutoff frequencies to the output while attenuating voltages at frequencies between the two cutoff frequencies. Bandpass filters and Bandstop filters thus perform complementary functions in the frequency domain. Bandstop filters are also characterized by same parameters o Two cutoff frequencies 1 C ω , 2 C ω o The center frequency ω o The bandwidth β o The quality factor Q Only two of these five parameters can be specified independently These parameters are defined in the same way for both types of filters. So we examine Bandstop filters in the same way as we did with the Bandpass filters. EE 205 Dr. A. Zidouri- 4- Bandstop Filter: Center Frequency, Bandwidth, and Quality Factor The center frequency ω is defined as the frequency for which a circuit’s TF is purely real. It is also referred to as the resonant frequency or corner frequency The center frequency is the geometric center of the stopband, that is, 1 2 C C ω...
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3-Lesson_Notes_Lecture29_ee205 - EE 205 Dr. A. Zidouri- 1-...

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