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LOWPASS FILTER
JAWAD AHMED
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CONTENTS
INTRODUCTION
DEFINITION
CHARCTERSITICS
TYPES OF LOWPASS
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Most of the signals we deal with
in real life get corrupteed in
some way or another by some
unwanted signals to get rid of
these interferences, or at least
reduce their effects we use
Signal filtering techniques
INTRODUCTION
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WHAT IS FILTER?
A Filter is an
electronic circuit that
removes / attenuates,
from a signal, some
unwanted components
or features.
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LOWPASS FILTER
A low-pass filter is an electronic filter that passes low-frequency
signals and attenuates (reduces the amplitude of) signals with
frequencies higher than the cutoff frequency.
It is sometimes called a high-cut filter, or treble cut filter when
used in audio applications.
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CHARACTERISTICS
Cut-Off Frequency (fc): Also referred to as the corner frequency, this is the frequency or frequencies that define the limits of the filter range.
Stop Band, Pass Band & Transition Band
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TYPES OF LOWPASS FILTER
There are two basic kinds of circuits capable of
accomplishing this objective, and many
variations of each one
INDUCTIVE CAPACITIVE&
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INDUCTIVE LOWPASS FILTER
The inductor's impedance increases with increasing
frequency. This high impedance in series tends to block
high-frequency signals from getting to the load
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INDUCTIVE LOWPASS FILTER
The response of an inductive low-pass filter falls off
with increasing frequency.
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CAPACITIVE LOWPASS FILTER
The capacitor's impedance decreases with increasing
frequency. This low impedance in parallel with the load
resistance tends to short out high-frequency signals,
dropping most of the voltage across series resistor R1.
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CAPACITIVE LOWPASS FILTER
The response of a capacitive low-pass filter
falls off with increasing frequency.
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