Practice Utilization of Algorithms for Analog Filter Group Delay Optimization

This contribution deals with an application of three different algorithms which optimize a group delay of analog filters. One of them is a part of the professional circuit simulator Micro Cap 7 and the others two original algorithms are developed in the MATLAB environment. An all-pass network is used to optimize the group delay of an arbitrary analog filter. Introduced algorithms look for an optimal order and optimal coefficients of an all-pass net- work transfer function. Theoretical foundations are intro- duced and all algorithms are tested using the optimization of testing analog filter. The optimization is always run three times because the second, third and fourth-order all- pass network is used. An equalization of the original group delay is a main objective of these optimizations. All outputs of all algorithms are critically evaluated and also de- scribed.

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