2-5 activefilters
DESCRIPTION
kjfghfhffTRANSCRIPT
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Dr. Bonnie H. FerriProfessor and Associate ChairSchool of Electrical and Computer Engineering
School of Electrical and Computer Engineering
Introduction to Electronics
An introduction to electronic circuit components and a study of circuits containing such devices.
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Dr. Bonnie H. FerriProfessor and Associate ChairSchool of Electrical and Computer Engineering
School of Electrical and Computer Engineering
Active Filters
Introduce active filters and show different types of filters
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Introduced differentiator and integrator op amp circuits
Previous Lesson
3
-
Introduce active filter circuits
Lesson Objectives
4
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Analog Filters
Analog FilterVin Vout
0 0.05 0.1 0.15 0.2 0.25-2
-1
0
1
2
Time (sec)
v(t)
0 0.05 0.1 0.15 0.2 0.25-1.5
-1
-0.5
0
0.5
1
1.5
Time (sec)
v(t)
0 200 400 600 800 10000
0.2
0.4
0.6
0.8
1
Mag
nitu
de
H()
|H()|
(rad/sec)5
-
Quiz
Vin = 1 + cos(10(2t)) + cos(100(2t)) Vout = 0.45cos(10(2t)+1) + 0.97cos(100(2t) +2)
6
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Summary of RC and RLC (Passive) Filters
vinR +
-voC
vin
R +
-vo
CL
vin R+
-vo
C
Mag
nitu
de (d
B)
Bode Plots
Mag
nitu
de (d
B)
Mag
nitu
de (d
B)
7
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Depletes power
No isolation
Limitations of RLC Passive Filters
Analog FilterVin Vo
vinR +
-voC
8
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has its own power supply Most common active filters are made from op amps Provide isolation
Active Filters
Op Amp CircuitVin Vout
9
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An is a circuit that has a specific shaped frequency response
A is made of op amps and has its own power supply. Advantages over RLC passive filters: Provides isolation (cascade filters) Boosts the power Can provide sharper roll-off
Summary
10
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Lowpass filter
Next Lesson
11
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Derivation: Vin = iZ1Vo = -iZf = -(Zf/Z1)Vin
Impedance Gain
inin
Fo VZ
ZV =
12
Slide Number 1Slide Number 2Previous LessonLesson ObjectivesAnalog FiltersQuizSummary of RC and RLC (Passive) FiltersLimitations of RLC Passive FiltersActive FiltersSummaryNext LessonImpedance Gain