Title :
Improved LR algorithm for computation of the approximate symbolic pole/zero expressions
Author :
Gheorghe, Alexandru Gabriel ; Constantinescu, Florin ; Nitescu, Miruna
Author_Institution :
Dept. of Electron., Tech. Univ. “Gh. Asachi”, Iasi, Romania
Abstract :
The following improvements are made to the symbolic LR algorithm for the computation of the approximate pole/zero expressions: formulation of the “state-like” matrix in the case d=0 in the output equation by the implementation of the Sandberg-So and Davison algorithms, using of matrices so that their diagonal elements are not placed in the decreasing order of their modules, replacing the search for the eigenvalue clusters with the elimination of one or two line and column pair during symbolic LR iterations. The zero symbolic expressions in term of transistor parameters for a LNA in the 900 MHz band illustrates these improvements. The proposed algorithm is similar or better with respect to the best ones implemented in ANALOG INSYDES and SYMBA software packages.
Keywords :
iterative methods; low noise amplifiers; matrix algebra; poles and zeros; transistors; Davison algorithm; LNA; Sandberg-So algorithm; approximate symbolic pole/zero expressions; column pair; diagonal elements; eigenvalue clusters; frequency 900 MHz; state-like matrix; symbolic LR algorithm; symbolic LR iterations; transistor parameters; zero symbolic expressions; Algorithm design and analysis; Approximation algorithms; Clustering algorithms; Computers; Eigenvalues and eigenfunctions; Equations; Poles and zeros; LR iterations; approximate symbolic expressions; pole/zero computation;
Conference_Titel :
AFRICON, 2013
Conference_Location :
Pointe-Aux-Piments
Print_ISBN :
978-1-4673-5940-5
DOI :
10.1109/AFRCON.2013.6757796
