![]() An elliptic filter creates notches by summing the highpass and lowpass outputs of 2nd order stages. This question requires a bit of explanation. When we have entered the other parameters, FilterCAD asks “Remove highest f n?” (Y/N). ![]() In the case of an elliptic response we have one additional question to answer before the response is synthesized. We’ll specify a maximum passband ripple of 0.1dB, an attenuation of 60dB, a corner frequency of 1000Hz, and a stopband frequency of 1300Hz. Bob Dobkin, Jim Williams, in Analog Circuit Design, 2013 Two elliptic examplesįor our next example, we will design a lowpass filter with an elliptic response.
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