Ideal Lowpass Filters [closed]

1. Why is ideal low pass filter impossible?
2. What is the biggest disadvantage of ideal low pass filter?
3. Is ideal low pass filter stable?
4. What is an ideal low pass filter?

Why is ideal low pass filter impossible?

However, it is practically not possible to implement an ideal lowpass filter since the required impulse response is infinitely long. Practical filters have finite length, which inevitably leads to a nontrivial transition band between a passband and a stopband, as illustrated in the solid blue line in Fig. ...

What is the biggest 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.

Is ideal low pass filter stable?

As a consequence, the ideal lowpass is not BIBO stable. We can use a technique that we developed in the proof of the stability theorem. And so for instance if we take omega c equal to pi over 3 The impulse response of the ideal filter will be one-third sinc of n over 3.

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.