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PSpice User Guide
Analog behavioral modeling
October 2019 356 Product Version 17.4-2019
© 1999-2019 All Rights Reserved.
Refer to the online PSpice Reference Guide for detailed
information.
Modeling mathematical or instantaneous relationships
The instantaneous models (using VALUE and TABLE extensions to
PSpice "E" and "G" devices in the part templates) enforce a direct
response to the input at each moment in time. For example, the
output might be equal to the square root of the input at every point in
time. Such a device has no memory, or, a flat frequency response.
These techniques can be used to model both linear and nonlinear
responses.
Note: For AC analysis, a nonlinear device is first linearized around
the bias point, and then the linear equivalent is used.
EVALUE and GVALUE parts
The EVALUE and GVALUE parts allow an instantaneous transfer
function to be written as a mathematical expression in standard
notation. These parts take the input signal, perform the function
specified by the EXPR property on the signal, and output the result
on the output pins.
In controlled sources, EXPR may contain constants and parameters
as well as voltages, currents, or time. Voltages may be either the
voltage at a net, such as V(5), or the voltage across two nets, such
as V(4,5). Currents must be the current through a voltage source (V