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Which of the following statements is NOT correct about Butterworth filter?

 

97. Which of the following statements is NOT correct about Butterworth filter? 

1. Butterworth is the most popular alignment type. [Option ID = 3217] 

2. Butterworth is characterised by its moderate amplitude and phase response. [Option ID = 3218] 

3. It exhibits the slowest roll‐off of any monoatomic (single‐slope) filter. [Option ID = 3219] 

4. This is the only filter whose 3dB down frequency equals its critical frequency (f =f ). [Option ID = 3220] 

Correct Answer : 3

Solution

Butterworth filter has a slower roll-off compared to the Chebyshev or Elliptic filters, it does not have the slowest roll-off of all monotonic filters. The Bessel filter actually has a much slower roll-off than the Butterworth filter for the same order (n). The Butterworth is "middle-of-the-road" in terms of roll-off speed.

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