Enhancement of transmission characteristics in elliptic filter design

In filter design, the delay characteristic becomes flatter as the values of the pole-Q decrease. For elliptic filters there exists a method by which one may continuously decrease Q values by increasing a single parameter within the design specifications. It is demonstrated that the pole Q can be lowered by increasing omega /sub s/ (the stopband frequency where the stopband begins). As a consequence the step response in the time domain as well as the delay characteristic in the frequency domain improves.<>