L11+L12+13: Filters Flashcards
What is Fluctuating Direct Current
What is the Frequency Domain (f-domain) method
What does the Fourier transform do
What does the Fourier transform do
What does the Fast Fourier transform (FFT) do
Table of Resistance and Reactance of a Resistor, Inductor, and Capacitor
What are Filters
Filters are circuits that are capable of passing with certain selected frequencies while rejecting/attenuating signals with other frequencies. This property is called selectivity.
How can you find Impedance, ZT and Phase Angle, tan(øz) for series and parallel RC and RL circuits
What are the two main types Filters
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.
What is the idea of Selectivity
Selectivity is when circuits are capable of passing signals with certain selected frequencies while rejecting/attenuating signals with other frequencies.
What are some types of Passive Filters
What is Logarithmic Filter Gain
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
How is the Attenuation, in decibels, calculated
Derivation for Attenuation (Loss) (Ndb)
What is a Bode Plot
What do low-pass filters do
How would the RC low pass filter respond at the extreme case where f = 0Hz (DC)
How would the RC low pass filter respond at the extreme case where f = ∞ Hz
What do High-Pass Filters do
How does the RC high pass filter responds at the the extreme case of f=0Hz (DC)
How does the RC high pass filter responds at the the extreme case of f=∞ Hz (DC)
What is a Band-Pass filter and how is it made
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.
What is Bandwidth
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
What level of f is generally considered to be the bandwidth
What is the Centre Frequency (fc) of a band pass filter
How can you work out the resonant frequency, fc of a band-pass filter like this
What is the Magnification Factor, Q of a filter
What is a Band-Stop (Notch) Filter
A band-stop filter blocks or severely attenuate a certain band of frequencies.
How is a Band-Stop Filter made
A low-pass and a high pass filter is combined in parallel to form a Band-stop filter
How is the Band Stop region created
Where is the output for the parallel low and high pass filters in a band stop filter
What is Notch Frequency, fN
How can you find the bandwidth of the band stop filter
