Optimization Design of Analog Filter′s Group-delay Inner Equalization
Hongmei Ma · Telecommunication Engineering · 2011
This paper proposes an analog filter′s group-delay inner equalization optimal design method in order to solve the contradiction between the filter′s amplitude-frequency characteristic arithmetic symmetry and the group-delay ripple in pass-band.The group-delay equalizer is coupled to the circuit designed by network synthesis method,then the group-delay is approached to a straight line using least square method,and the coupled circuit is optimized to reduce the group-delay ripple by unconstrained optimization method.The simulation results indicate that the proposed method can get arithmetic symmetrical amplitude-frequency and the smaller group-delay ripple in pass-band.The designed circuit has merits of less order and easy to design.