An interactive editor and a batch driver have been written to ease the use of the SPICE program by system designers, and the interactive graphical post processor, NUTMEG, supplied by U. We have modified the SPICE circuit analysis code (version 2G.6), developed originally at the Electronic Research Laboratory of the University of California, Berkeley, to allow it to be used on MSDOS-based, personal computers and to give it two additional circuit elements needed by firing systems-fuses and saturating inductances. Numerical simulation of firing systems requires both the appropriate circuit analysis framework and the special element models required by the application. Time functions may be described by straight-line segments or by sine, damped sine, and exponential functions. Nonstandard models may be constructed from standard models or by more ยป using the special equations interface. The program contains built-in standard models for resistors, voltage and current sources, capacitors, inductors including mutual couplings, switches, junction diodes and transistors, FETS, and MOS devices. Circuit descriptions may be saved on disk files for storage and later use. The circuit topology and/or part values may then be changed by the user, and a new analysis, requested. The program then automatically generates and solves the circuit equations, providing the user with printed or plotted output. The user describes the problem by entering the circuit topology and part parameters. The program features 100 external node-200 branch capability conversional, free-format input language built-in junction, FET, MOS, and switch models sparse matrix algorithm with extended-precision H matrix and T vector calculations, for fast and accurate execution linear transconductances: beta, GM, MU, ZM accurate and fast radiation effects analysis special interface for user-defined equations selective control of multiple outputs graphical outputs in wide and narrow formats and on-line parameter modification capability. The program solves linear and nonlinear simultaneous equations which characterize the mathematical models used to predict circuit response. AITRAC is a program designed for on-line, interactive, DC, and transient analysis of electronic circuits.
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