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Introduction
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All of the power devices use sophisticated subcircuit structures, thus providing very realistic behavior. PSpice s behavioral modeling accommodation is very powerful and extensive. Cadence/OrCAD is dedicated to the improvement of their products. They are continually enhancing their software and adding features that increase productivity. Cadence/OrCAD maintains a knowledgeable technical support staff and works closely with engineers, in order to make their software as productive as possible. PSpice is the most predominant SPICE-based simulator in use today. PSpice, SPICE 3, and Other SPICE Extensions The majority of the models and circuit elements in this book utilize SPICE 2G.6 syntax. Wherever possible, generic syntax is used so that the models can be adapted to various simulators. However, some key elements are modeled using PSpice speci c and/or Berkeley SPICE 3 syntax extensions. In particular, SPICE 3 has an arbitrary dependent source, or B element, that allows mathematical expressions of voltages, currents, and other quantities to be used. PSpice extends the syntax of the E- and G-controlled source elements even further in order to add many behavioral modeling constructs including mathematical and logical If-Then-Else expressions. Switches with or without hysteresis can be created in both PSpice and SPICE 3 and are also used extensively. The newer SPICE 3 elements provide greater exibility and improved performance. Their syntax and behavior are brie y reviewed later, along with several other SPICE extensions. More information is available in [5]. To emulate the nonlinear large-signal behavior, often found in power devices, such models require arbitrary X-Y transfer functions. The polynomial math features of SPICE 2, while universally accepted, are very limited. Therefore, the more exible Behavioral Math Expressions feature of Berkeley SPICE 3 is used extensively. In addition, there are occasions when a procedural type of behavior is required. To produce this functionality, PSpice uses an If-Then-Else syntax. This syntax extension has also been added to the Berkeley SPICE 3 B-element in some versions of SPICE, but not all of them. Some SPICE vendors include a table-type function where the transfer function is de ned by a series of X-Y data points. The table function is supported in PSpice. However, the advantage of the If-Then-Else capability over the table model is that the transfer function between each X-Y data point can
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be nonlinear in the If-Then-Else syntax, whereas the Table model only supports linear segments between points. Nonlinear PWM IC models require basic digital logic functions such as latches and ip- ops. These functions can be ef ciently modeled in several ways in PSpice, but are prohibitively complex to model, using SPICE 2 polynomial syntax. Therefore, another PSpice syntax extension, Boolean Logic Expressions, was chosen to model the digital functions. If your simulator has support for the SPICE 3 functions and equivalent support for the PSpice extensions, you can easily translate the syntax used in this book. PSpice is based on Berkeley SPICE. However, it has been signi cantly enhanced over the generic Berkeley version in terms of its simulation algorithms, graphical user interface, advanced multirun analysis, and model support. Shown later is the syntax for the Berkeley SPICE 3 element and PSpice s behavioral extensions, along with some examples on how to translate the syntax extensions to other SPICE simulators. Nonlinear Dependent Sources (B, E, and G Elements)
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The arbitrary dependent source (B element) allows an instantaneous transfer function to be written as a mathematical expression. This B element is a standard Berkeley SPICE 3 element. The expressions, [EXPR], given for V and I may be any function of node voltages, currents through any element, or a variety of traditional math functions. In PSpice, the E- and G-controlled source elements are utilized: Format: Bname N+N [ I = EXPR ][V = EXPR ] B1 0 1 I = sqrt(cos(v(1)/(v(2,3)))) B4 outp outn V = exp(i(vdd) 2) B1 1 0 V = V(2) abs(I(V1)) + V(3) B3 1 2 V = I(R1) B2 2 3 I = {V(7) Sin(Time)}
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SPICE 3 Examples:
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Note: Some, but not all, SPICE simulators allow the keywords Time, Freq, or Temp in B element expressions. Format: EnameN + N Value = {EXP R} Gname N + N Value = {EXPR}
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