L11+L12+13: Filters

Question 1

What is Fluctuating Direct Current

Answer 1

Question 2

What is the Frequency Domain (f-domain) method

Answer 2

Question 3

What does the Fourier transform do

Answer 3

Question 4

What does the Fourier transform do

Answer 4

Question 5

What does the Fast Fourier transform (FFT) do

Answer 5

Question 6

Table of Resistance and Reactance of a Resistor, Inductor, and Capacitor

Answer 6

Question 7

What are Filters

Answer 7

Filters are circuits that are capable of passing with certain selected frequencies while rejecting/attenuating signals with other frequencies. This property is called selectivity.

Question 7

How can you find Impedance, ZT and Phase Angle, tan(øz) for series and parallel RC and RL circuits

Answer 7

Question 8

What are the two main types Filters

Answer 8

Passive Filters:
Passive filters use passive components such as R, C, or L

Active Filters:
Active filters use transistors or op-amps combined with passive
RC, RL, or RCL circuits.

Question 8

What is the idea of Selectivity

Answer 8

Selectivity is when circuits are capable of passing signals with certain selected frequencies while rejecting/attenuating signals with other frequencies.

Question 9

What are some types of Passive Filters

Answer 9

Question 10

What is Logarithmic Filter Gain

Answer 10

The decibel level can be defined as relative gain of one level vs other level.
* Decibel is a logarithmic unit that indicates ratio/gain.
* It is a dimensionless unit.

Decibel Symbol: dB

Question 11

How is the Attenuation, in decibels, calculated

Answer 11

Question 12

Derivation for Attenuation (Loss) (Ndb)

Answer 12

Question 13

What is a Bode Plot

Answer 13

Question 14

What do low-pass filters do

Answer 14

Question 15

How would the RC low pass filter respond at the extreme case where f = 0Hz (DC)

Answer 15

Question 16

How would the RC low pass filter respond at the extreme case where f = ∞ Hz

Answer 16

Question 17

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Question 18

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Question 19

What do High-Pass Filters do

Answer 19

Question 20

How does the RC high pass filter responds at the the extreme case of f=0Hz (DC)

Answer 20

Question 21

How does the RC high pass filter responds at the the extreme case of f=∞ Hz (DC)

Answer 21

Question 22

Answer 22

Question 23

Answer 23

Question 24

What is a Band-Pass filter and how is it made

Answer 24

Question 25

How must the cut-off frequencies of the high and low pass filters be set up to ensure the proper working of the band-pass filter.

Answer 25

Question 26

What is Bandwidth

Answer 26

The term bandwidth Δf can be defined as the range of frequency that exists between the higher cut-off frequency fc2 and lower cut off frequency fc1

Question 27

What level of f is generally considered to be the bandwidth

Answer 27

Question 28

What is the Centre Frequency (fc) of a band pass filter

Answer 28

Question 29

How can you work out the resonant frequency, fc of a band-pass filter like this

Answer 29

Question 30

What is the Magnification Factor, Q of a filter

Answer 30

Question 31

What is a Band-Stop (Notch) Filter

Answer 31

A band-stop filter blocks or severely attenuate a certain band of frequencies.

Question 32

How is a Band-Stop Filter made

Answer 32

A low-pass and a high pass filter is combined in parallel to form a Band-stop filter

Question 33

How is the Band Stop region created

Answer 33

Question 34

Where is the output for the parallel low and high pass filters in a band stop filter

Answer 34

Question 35

What is Notch Frequency, fN

Answer 35

Question 36

How can you find the bandwidth of the band stop filter

Answer 36

Question 37

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Question 38

Answer 38