Locus of the driving-point immittance of a network with more than one variable immittance
W. Troop, Eric R. Peskin · IEEE Transactions on Circuit Theory · 1972
A method of calculating driving-point immittance loci of active or passive series-parallel networks is presented. With charts and special notations for circular and half-plane loci, the calculation is as straightforward as the usual calculation of driving-point immittance. The method is also applied to nonseries-parallel networks with two variable immittances.