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Chapter 14 Filter Circuits

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Understand the Concept of Transfer Functions. Be Familiar with the Decibel Scale. ... Three-way, crossover network with 12 dB per octave at cutoff. 19. Eeng 224 ... – PowerPoint PPT presentation

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Title: Chapter 14 Filter Circuits


1
Chapter 14 Filter Circuits
  • Chapter Objectives
  • Understand the Concept of Transfer Functions.
  • Be Familiar with the Decibel Scale.
  • Learn how to make Bode Magnitude and Phase plots.
  • Learn about series and parallel resonant RLC
    circuits.
  • Know Different Types of Passive and Active
    Filters and their Characteristics.
  • Understand the use of scaling in circuit
    analysis.
  • Be Able to use PSpice to obtain frequency
    response.
  • Apply what is learnt to radio receiver and
    touch-tone telephone.

Huseyin Bilgekul Eeng 224 Circuit Theory
II Department of Electrical and Electronic
Engineering Eastern Mediterranean University
2
Ideal Filter Magnitude Responses
  • Magnitude responses of different type of ideal
    filter functions.

3
Actual Filter Magnitude Responses
4
LOWPASS FILTER
  • A low pass filter is designed to pas only
    frequencies from DC up to the cutoff frequency ?c.

5
LOWPASS FILTER
Regulator (a) effect of spike in current on the
input side (b) noise reduction.
6
HIGHPASS FILTER
  • A high pass filter is designed to pass all the
    frequencies above its cutoff frequency ?c.

7
BANDPASS FILTER
  • A bandpass filter is designed to pass all the
    frequencies within a band of frequencies, ?1 lt ?
    lt ?2

8
BANDSTOP FILTER
  • A Bandstop filter is designed to stop or
    eliminate all the frequencies within a band of
    frequencies ?1 lt ? lt ?2 .

9
Active first-order low-pass filter
  • Active filters use also active devices such as
    OP AMPs.
  • Passive filters use only passive devices such as
    inductors and capacitors only.

10
Active first-order High-pass filter
11
Active Bandpass Filter
  • A bandpass filter is obtained by cascading a LPF
    and a HPF together with an inverting amplifier to
    provide the desired gain.

Active Bandpass Filter Block Diagram.
Frequency Response
12
Active Bandpass Filter Example
  • Three cascaded stages are used to realize the
    bandpass filter.
  • A LPF cascaded with a HPF and an inverter stage.

13
Active Bandreject Filter
  • A bandreject filter may be constructed by
    parallel combination of a LPF and a HPF filter
    and a summing amplifier.

Active Bandreject Filter Block
Diagram. Frequency Response
14
Active Bandreject Filter Example
15
Simplified Block Diagram of a Superheterodyne AM
Radio Receiver
The input signal is downconverted in frequency to
an intermediate frequency (IF) before
amplification. Good IF filters are
required. The signal is again downconverted in
frequency after IF amplification.
16
Frequency Assignments for Touch-tone Dialing
17
Three-way, crossover network with 6 dB per
octave.
18
Three-way, crossover network with 12 dB per
octave at cutoff.
19
Detection Scheme for Touch-tone Dialing
20
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