Original sentence: Butterworth's filter becomes a none trivial example when it is implemented entirely with passive components.Rather than enumerate the behaviour (transfer function, attenuation fuction, delay function and so on) of a specific circuit, instead a requirement for the image impedance itself was developed
Edited sentence: Butterworth's filter becomes a non-trivial example when it is implemented entirely with passive components.Rather than enumerate the behaviour (transfer function, attenuation function, delay function and so on) of a specific circuit, instead a requirement for the image impedance itself was developed