AdvancedA-002-012-002
What are the distinguishing features of a Butterworth filter?
B
Answer
Circuit design and power supplies
Type
A
It only requires conductors
B
It has a maximally flat response over its pass-band
C
It only requires capacitors
D
The product of its series and shunt-element impedances is a constant for all frequencies
Answer Notes
A Butterworth filter is an active or passive filter design mathematically optimized to have a 'maximally flat' frequency response in its passband. This means there is no ripple or fluctuation in the signal amplitude before it reaches the cutoff frequency.
While it sacrifices a steep roll-off (sharp cutoff) compared to other filter designs, this flatness makes the Butterworth filter ideal for applications where maintaining a precise, unvarying signal level across the passband is critical. The other options describe physical component limitations or different network topologies entirely.
Previous · A-002-012-001
What are the three general groupings of filters?
Next · A-002-012-003
Which filter type is described as having ripple in the passband and a sharp cutoff?