Question

Select the correct statement regarding a Bessel filter.
1. Phase shift increases exponentially with frequency.
2. Phase shift increases linearly with frequency.
3. Phase shift decreases linearly with frequency.
4. Phase shift decreases exponentially with frequency.

Answer 1

Correct Answer - Option 2 : Phase shift increases linearly with frequency.

Explanation:

Bessel Filter's Phase shift increases linearly with frequency.

Bessel Filter:

• The Bessel filter provides ideal phase characteristics with an approximately linear phase re­sponse up to nearly cut-off frequency.
• Though it has a very linear phase response but a fairly gentle skirt slope.
• For applications where the phase characteristic is important, the Bessel filter is used.
• It is a minimal phase shift filter even though its cut-off characteristics are not very sharp.
• It is well suited for pulse applica­tions.

An active filter is a type of analog circuit implementing an electronic filter using active components, typically an amplifier. Amplifiers included in a filter design can be used to improve the cost, performance, and predictability of a filter.

Types of active filters. 

• Butterworth 
• Chebyshev 
• Bessel
• Elliptic filters.