Practice Utilization of Algorithms for Analog Filter Group Delay Optimization

• Main Authors: K. Hajek, P. Ziska, K. Zaplatilek
• Format: Article
• Language: English
• Published: Spolecnost pro radioelektronicke inzenyrstvi 2007-04-01
• Series: Radioengineering
• Subjects: Analog filters; group delay; optimization; all-pass networks; MATLAB; Micro-Cap; evolutionary algorithms
• Online Access: http://www.radioeng.cz/fulltexts/2007/07_01_07_15.pdf

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 network transfer function. Theoretical foundations are introduced 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 described.