applications: passive filters - cairo...
TRANSCRIPT
![Page 1: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/1.jpg)
Passive Filters I
Dr. Mohamed Refky Amin
Electronics and Electrical Communications Engineering Department (EECE)
Cairo University
http://scholar.cu.edu.eg/refky/ 1
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OUTLINE
• Introduction
• Low-pass Filters
• High-pass Filters
• Band-pass and Band-stop Filters
• Double tune filter
2 Dr. Mohamed Refky
![Page 3: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/3.jpg)
Introduction
3
• A lowpass filter passes low frequencies and stops high
frequencies.
• A highpass filter passes high frequencies and rejects low
frequencies.
• A bandpass filter passes frequencies within a frequency band
and blocks or attenuates frequencies outside the band.
• A bandstop filter passes frequencies outside a frequency band
and blocks or attenuates frequencies within the band.
Type of the filter
Low pass 0
High pass 0
Band-pass 0 0
Band-Stop
Dr. Mohamed Refky
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Introduction
4
• A filter is a passive filter if it consists of only passive elements
R, L, and C. It is said to be an active filter if it consists of
active elements (such as transistors and op amps) in addition to
passive elements R, L, and C.
• For a passive filter, the maximum output amplitude is equal to
the input amplitude
• For an active filter, the output amplitude can be greater than the
input amplitude
Dr. Mohamed Refky
![Page 5: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/5.jpg)
Passive Filters
5
Low-pass RC Filter
Dr. Mohamed Refky
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Passive Filters
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Low-pass RC Filter
Dr. Mohamed Refky
![Page 7: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/7.jpg)
Passive Filters
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Low-pass RC Filter
Dr. Mohamed Refky
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Passive Filters
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Low-pass RC Filter
Negative angle means that
the circuit is a Lag Network
Dr. Mohamed Refky
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Passive Filters
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Example 1
Dr. Mohamed Refky
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Passive Filters
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Example 2
Dr. Mohamed Refky
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Passive Filters
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High-pass RC Filter
Dr. Mohamed Refky
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Passive Filters
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High-pass RC Filter
Dr. Mohamed Refky
![Page 13: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/13.jpg)
Passive Filters
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High-pass RC Filter
Dr. Mohamed Refky
![Page 14: Applications: Passive Filters - Cairo Universityscholar.cu.edu.eg/?q=refky/files/lecture_3-_electric_filters.pdf · R, L, and C. It is said to be an active filter if it consists of](https://reader033.vdocument.in/reader033/viewer/2022042007/5e7076434416115e967bfb36/html5/thumbnails/14.jpg)
Passive Filters
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High-pass RC Filter
Positive angle means that the
circuit is a Lead Network
Dr. Mohamed Refky
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Passive Filters
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Example 3
Dr. Mohamed Refky
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Passive Filters
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Example 4
Dr. Mohamed Refky
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Passive Filters
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Band-pass Filter
0
0
Dr. Mohamed Refky
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Passive Filters
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Band-pass Filter
Dr. Mohamed Refky
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Passive Filters
Band-pass Filter
Dr. Mohamed Refky 19
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Passive Filters
Band-pass Filter
Dr. Mohamed Refky 20
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Passive Filters
Band-stop Filter
Dr. Mohamed Refky 21
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Passive Filters
Band-stop Filter
Dr. Mohamed Refky 22
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Passive Filters
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Band-stop Filter
Dr. Mohamed Refky
What is the Bandwidth?
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Passive Filters
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Band-stop Filter
Dr. Mohamed Refky
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Passive Filters
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Band-stop and Band-pass Filters
Always valid
Valid only at resonance
Dr. Mohamed Refky
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Passive Filters
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Example 5
Dr. Mohamed Refky
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Passive Filters
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Example 6
Dr. Mohamed Refky