Howtosignalprocessing
- What is an ideal low pass filter?
- Why ideal low pass filter is not possible?
- What is the disadvantage of ideal low pass filter?
- What are ideal filters?
What is an ideal low pass filter?
An ideal low pass filter is the one which transmits all the signal of frequencies less than a certain frequency ωc radians per second without any distortion and blocks all the signals of frequencies above ωc radians per second.
Why ideal low pass filter is not possible?
However, it is practically not possible to implement an ideal lowpass filter since the required impulse response is infinitely long.
What is the disadvantage of ideal low pass filter?
First Order Low Pass Filter
While this configuration provides good stability to the filter, its main disadvantage is that it has no voltage gain above one. However, although the voltage gain is unity the power gain is very high as its output impedance is much lower than its input impedance.
What are ideal filters?
An ideal filter is considered to have a specified, nonzero magnitude for one or more bands of frequencies and is considered to have zero magnitude for one or more bands of frequencies. On the other hand, practical implementation constraints require that a filter be causal.
