Lazy-expansion symbolic expression approximation in SYNAP

A lazy-expansion technique for generating small approximate symbolic analog circuit analysis expressions is described. Statistics for this technique as implemented in the symbolic analysis progmm SYNAP are presented and show a two order-of-magnitude speed improvement (on larger circuits) as compared with traditional full-expansion techniques. This technique also allows larger circuits to be analyzed. Also presented are SYNAP ‘s methods for eliminatingpole and zero movement at the design point and for handling variables representing device mismatches.

[1]  Georges Gielen,et al.  Symbolic approximation strategies and the symbolic analysis of large and nonlinear circuits , 1991, 1991., IEEE International Sympoisum on Circuits and Systems.

[2]  Eric A. Vittoz,et al.  IDAC: an interactive design tool for analog CMOS circuits , 1987 .

[3]  C. Meixenberger,et al.  An open design tool for analog circuits , 1991, 1991., IEEE International Sympoisum on Circuits and Systems.

[4]  P.R. Gray,et al.  OPASYN: a compiler for CMOS operational amplifiers , 1990, IEEE Trans. Comput. Aided Des. Integr. Circuits Syst..

[5]  A. Rodríguez-Vázquez,et al.  Interactive AC modeling and characterization of analog circuits via symbolic analysis , 1991 .

[6]  Kishore Singhal,et al.  Computer Methods for Circuit Analysis and Design , 1983 .

[7]  M.G.R. Degrauwe,et al.  A symbolic analysis tool for analog circuit design automation , 1988, [1988] IEEE International Conference on Computer-Aided Design (ICCAD-89) Digest of Technical Papers.

[8]  Georges Gielen,et al.  Symbolic analysis for automated design of analog integrated circuits , 1991, The Kluwer international series in engineering and computer science.