NORTH ATLANTIC UNIVERSITY UNION
The pole-zero analysis is generally known to be very sensitive to the numerical precision of the computer arithmetic's. In the paper, various methods are suggested for solving that problem. First, an optimal pivoting strategy of the algorithm that reduces the general eigenvalue problem to the standard one is presented for both full and sparse-matrix procedures. The algorithm increases the precision of the semi-symbolic analysis, especially for the large-scale radiofrequency circuits. A novel technique is also incorporated recognizing multiple poles or zeros, which are often computed inaccurately by standard algorithms.