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BRANCH : ELECTRICAL ENGINEERING�SEMESTER : 3RD �SUBJECT : CIRCUIT & NETWORK THEORY�

CHAPTER : 09

TOPIC : FILTERS

FACULTY : DR. MRUTYUNJAY DAS

AY: 2021 – 22

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Mayurbhanj School Of Engineering, Baripada

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CONTENTS

  • Introduction
  • Properties of Filter
  • Classification of Filter
  • Constant K-Filter
  • Working of low pass filter
  • Working of high pass filter
  • Analysis of prototype low pass filter

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  • Design of low pass filter
  • Analysis of prototype high pass filter
  • Design of high pass filter
  • Analysis of prototype band pass filter
  • Design of band pass filter
  • Analysis of prototype band stop filter
  • Design of band stop filter

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INTRODUCTION�

  • A filter is an electrical network that can transmit signals within a specified frequency range.
  • This frequency range is called and other frequency band where the signals are suppressed is called attenuation band or stop band.
  • The frequency that separates the pass and attenuation bands is known as cut-off frequency.

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PROPERTIES OF FILTER

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CLASSIFICATION OF FILTER

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CLASSIFICATION OF FILTER

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CLASSIFICATION OF FILTER

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CONSTANT K-FILTER (PROTOTYPE FILTER)

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WORKING OF LOW PASS FILTER

  • With the increase in frequency of the input signal, the shunt capacitive reactance decreases. This will allow more current to be returning back to the source through the low impedance path.
  • At higher frequency, the entire input current returns to the source through the shunt branch which becomes practically a short circuit link at this frequency.

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WORKING OF HIGH PASS FILTER

  • At high frequency, capacitive reactance in the series arm decreases while the inductive reactance in the shunt arm increases.
  • Hence the section allows the passage of higher order frequencies blocking the lower order frequencies.

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ANALYSIS OF PROTOTYPE FILTER SECTION

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ANALYSIS OF PROTOTYPE LOW PASS FILTER

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ANALYSIS OF PROTOTYPE LOW PASS FILTER

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DESIGN OF A PROTOTYPE LPF

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ANALYSIS OF PROTOTYPE HIGH PASS FILTER

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ANALYSIS OF PROTOTYPE HIGH PASS FILTER

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DESIGN OF A PROTOTYPE HPF

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ANALYSIS OF PROTOTYPE BAND PASS FILTER�

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DESIGN OF A PROTOTYPE BPF

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ANALYSIS OF PROTOTYPE BAND STOP FILTER

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DESIGN OF A PROTOTYPE BSF

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