Experiment description

The goal of this experiment is to determine the way slew rate is modelled by different
device level and macromodels. 
For this purpose an input file of a voltage follower was created.
Spice was run several times, using different input voltages and different models for the opamp.
This input file and all of the models used in this experiment, can be downloaded 
from this site.

The input signal is a pulse with steep slopes. The input frequency is 
low enough to avoid distortion caused by first-order behaviour of the 
opamp. Every model is tested using an input voltage of 10Vptp (-5/+5) and 
20Vptp (-10/+10). Exceptions are made for both the macro and device level model
from Hoefer & Nielinger: the second simulation was done using an input
voltage of 18Vptp (-9/+9). To ensure correct results  simulation is performed 
over at least 2 periods of the input signal. The reason for this is that in 
the first period of the input signal transient effects can appear.

In the generated output files we checked whether the models allowed to
simulate asymmetrical slew rates and the second-order effect in the rising 
slope. We derived the slew rates in the probe-program. A survey of these
results can be found in the properties of each model. The probe results 
for each model can be found under the header [Simulation results].

All simulations were done using Microsim PSpice v7.X.