Implementation of pole-zero analysis in SPICE based on the MD method

Author

Raghuram, R. ; Divekar, D. ; Wang, P.

Author_Institution

CONTEC Microelectronics USA Inc., San Jose, CA, USA

fYear

1991

fDate

14-17 May 1991

Firstpage

380

Abstract

The modification-decomposition (MD) method for finding the poles and zeros of a general circuit has been implemented in SPICE 3c1. The method is based on finding the eigenvalues of the time constant matrix, and convergence is guaranteed as long as the circuit has a DC solution. The method requires no complex operations and only one LU decomposition. It fits in very conveniently with the framework used in SPICE. Special elements like transcapacitances and transfer function blocks are taken care of in the implementation. Apart from a standard filter application involving RC elements and op amps, an ECL (emitter coupled logic) ring oscillator and root locus of a switching mode power supply are given as examples

Keywords

SPICE; circuit analysis computing; eigenvalues and eigenfunctions; poles and zeros; transfer functions; DC solution; ECL; LU decomposition; MD method; SPICE; convergence; eigenvalues; filter application; modification-decomposition method; pole-zero analysis; ring oscillator; root locus; switching mode power supply; time constant matrix; transcapacitances; transfer function blocks; Circuits; Eigenvalues and eigenfunctions; Filters; Logic; Matrix decomposition; Operational amplifiers; Poles and zeros; Ring oscillators; SPICE; Transfer functions;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 1991., Proceedings of the 34th Midwest Symposium on

Conference_Location

Monterey, CA

Print_ISBN

0-7803-0620-1

Type

conf

DOI

10.1109/MWSCAS.1991.252176

Filename

252176