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Preliminary
The macromodels contained in this databook operate with the Pspice and SPice simulators and with the
ELDO simulator.
For most of the macromodels enclosed, no specific precautions are required for use.
They are only valid in the supply voltage and temperature conditions defined for each macromodel.
Macromodelling
A good macromodel is a mathematical model as close as possible to the actual circuit. However, due to
simulation time problems, it must be composed of simple mathematical equations.
Placed in an assembly to perform and validate an application, it must not obstruct rapid convergence of
the system. Consequently, in order to satisfy requirements both for convergence speed and compliance
with the actual circuit, we have considered and allowed for a certain number of important parameters.
List of the parameters taken into consideration in the macromodels
❑ Input Offset Voltage (generally equal to “0")
❑ Input Bias Current (for bipolar input stages)
❑ Open-loop Gain
❑ Frequency at Unity Gain
❑ Gain Bandwidth
❑ Gain Margin
❑ Phase Margin (limited to 70°C)
❑ Positive or Negative Supply Rejection Ratio
❑ Slew Rate ±
❑ Settling Time at 0.1%
❑ Input Common-mode Voltage Range
❑ Common-mode Rejection Ratio
❑ Output Impedance
❑ Output Current
❑ Supply Current
❑ Input Capacitance
Examples of effects not taken into consideration in the macromodels operational amplifier files
❑ The input offset voltage statistic due to the great variety in each circuit
❑ The temperature effect on the parametric values
❑ Input offset current
❑ Input noise current
❑ And some specific parameters such as distorsion, crosstalk ...
❑ Input noise voltage
Macromodels User Manual
March 2002
