Ideal low pass filter impulse response

1. What is impulse response of ideal low pass filter?
2. What is the best frequency for low pass filter?
3. Why ideal low pass filter is not possible?
4. What is the output response of LPF?

What is impulse response of ideal low pass filter?

Thus, the impulse response of an ideal lowpass filter is a sinc function.

What is the best frequency for low pass filter?

The cutoff frequency for a low-pass filter is that frequency at which the output (load) voltage equals 70.7% of the input (source) voltage.

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 output response of LPF?

So to summarize, the Low Pass Filter has a constant output voltage from D.C. (0Hz), up to a specified Cut-off frequency, ( ƒ_C ) point. This cut-off frequency point is 0.707 or -3dB ( dB = –20log*V_OUT/IN ) of the voltage gain allowed to pass.