Least-mean-square (minimum integrated power loss ratio) lowpass filters with a pair of imaginary-axis zeros

If power is the main interest, then a class of filters with minimum integrated power loss ratio in the passband offers higher cutoff rate than the well known Butterworth filters. A technique is described to improve the cutoff rate further by introducing a pair of imaginary axis zeros, while the integrated power loss ratio in the passband is still kept at minimum. Other advantageous performances of the filters are also indicated. © 1978, The Institution of Electrical Engineers. All rights reserved.