Comparison of computer-aided tuning algorithms applied to the amplitude response of passive analogue filters

Computer aided filter tuning methods have been based on a sensitivity analysis of the network function of interest. Two tuning algorithms, one proposed by Antreich, Gleissner and Muller (1975) and one by Jobe (1979) were first compared using a Monte-Carlo type analysis of fifty different circuit simulations. The method proposed by Antreich et al. was found to be the more efficient. Two low-pass passive L /C elliptic filters were then tuned. The magnitude responses of these filters were particularly suited to the application of both algorithms. The results showed that both methods were capable of tuning the filters to within the specification using a maximum of three iterations or only eighteen measurements providing that the adjustable inductors were operating over an approximately linear portion of their inductance against turns characteristic