![]() Six MOSFET models are implemented: MOS1 is described by a square-law I-V characteristic, MOS2 is an analytical model, while MOS3 is a semi-empirical model MOS6 is a simple analytic model accurate in the short-channel region MOS4 and MOS5 are the BSIM (Berkeley Short-channel IGFET Model) and BSIM2. The JFET model is based on the FET model of Shichman and Hodges. The diode model can be used for either junction diodes or Schottky barrier diodes. ![]() In either case, charge-storage effects, ohmic resistances, and a current-dependent output conductance may be included. The model for the BJT is based on the integral-charge model of Gummel and Poon however, if the Gummel-Poon parameters are not specified, the model reduces to the simpler Ebers-Moll model. Spice has built-in models for the semiconductor devices, and the user need specify only the pertinent model parameter values. While Spice 3 was developed to include new features, it continues to support thoseĬapabilities and models which remain in extensive use in the Spice 2 program. The Spice 3 version is based directly on Spice 2g6. Circuits may contain resistors, capacitors, inductors, mutual inductors, independent voltage and current sources, four types of dependent sources, lossless and lossy transmission lines (two separate implementations), switches, uniform distributed RC lines, and the five most common semiconductor devices: diodes, BJTs, JFETs, MESFETs, and MOSFETs. Spice is a general-purpose circuit simulation program for nonlinear DC, nonlinear transient, and linear AC analyses. Original description of Spice 3f4 have also been made throughout the text. This paragraph, is indicated with its own display style. In this edition material that is specific to MacSpice, such as For example: the memory leaks that affected Spice 3f4 have been cured new algorithms have been developed to facilitate the simulation of large circuits, and to reduce simulation time MacSpice provides a robust multi-parameter optimizer and facilities for inter-process communication with other applications.This User's Guide closely follows the original ![]() It is compatible with Berkeley Spice 3f5 but incorporates many improvements - from simple bug-fixes to entirely new commands, algorithms and solution strategies. MacSpice 3.2 runs natively on Mac computers with 64-bit Intel or Apple silicon processors. The high quality of the MacSpice command interpreter makes the automation of tasks straightforward. MacSpice then builds a numerical model of the circuit and analyses this.Ī command interpreter (shell) is used to specify the types of analyses that are required and how the results should be processed, saved or displayed. Users may prepare netlists with a text editor, or derive them from a circuit diagram using a third-party schematic-capture application. ![]() This is a list of components and the nodes they connect to. MacSpice uses a text-file 'netlist' description of the circuit as input. It is usually cheaper and quicker to simulate a design than to build a prototype. Circuit simulation is a way of building and testing virtual models of electronic devices. MacSpice is an electronic circuit simulator.
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