Title :
Symbolic simulation of analog circuits in S- and Z-domain
Author :
Walscharts, Herman ; Gielen, Georges ; Sansen, Willy
Author_Institution :
Dept. Elektrotech., Katholieke Univ. Leuven, ESAT-MICAS, Heverlee, Belgium
Abstract :
A new symbolic simulator, called ISAAC, (interactive symbolic analysis of analog circuits), is described. ISAAC can derive all AC characteristics of both time-continuous and time-discrete analog circuits. Any linear network function is calculated by means of the consecutive setup and resolution of a set of s- or z-domain compacted MNA (CMNA) equations. Symbolic term cancellations are treated in an efficient way. ISAAC can generate both exact and compact approximated results. The approximation is performed by means of a heuristic algorithm. For complex cells such as a Miller compensated opamp and a fifth-order SC ladder filter, CPU times on a one MIPS machine are below 30 s
Keywords :
active filters; analogue circuits; digital simulation; frequency-domain analysis; linear network analysis; lumped parameter networks; AC characteristics; CPU times; ISAAC; Miller compensated opamp; compact approximated results; compacted MNA equations; complex cells; consecutive setup; efficient symbolic term cancellation treatment; exact results; fifth-order SC ladder filter; heuristic algorithm approximation; interactive symbolic analysis of analog circuits; linear network function; new symbolic simulator; one MIPS machine; s-domain set resolution; time-continuous analog circuits; time-discrete analog circuits; z-domain set resolution; Analog circuits; Analytical models; Approximation algorithms; Central Processing Unit; Circuit analysis; Circuit simulation; Equations; Filters; Heuristic algorithms; Transfer functions;
Conference_Titel :
Circuits and Systems, 1989., IEEE International Symposium on
Conference_Location :
Portland, OR
DOI :
10.1109/ISCAS.1989.100475
