40 Nonlinear Op-Amp Circuits
Name David Santiago Gordillo Barahona
Date 10-12-2020
Class ___________________
READING
Text,
Sections 19–1
through
19–3
OBJECTIVES
After performing this experiment, you will be able to:
1. Construct and test an op-amp comparator, an integrator, and a
differentiator circuit.
2. Determine the response of the circuits listed in objecti ve 1 to various
waveforms.
3. Troubleshoot faults in op-amp circuits.
MATERIALS NEEDED
Resistors:
One 330 Ω, one 1.0 kΩ, four 10 kΩ, three 22 kΩ, one 330 kΩ
Capacitors:
One 2200 pF, one 0.01 μF, two 1.0 μF
Three 741C op-amps
One 1 kΩ potentiometer
Two LEDs (one red, one green)
SUMMARY OF THEORY
The basic op-amp is a linear device; however, many applications exist in
which the op-amp is used in a nonlinear circuit. One of the most common
nonlinear applications is the comparator. A comparator is used to detect
which of two voltages is larger and to drive the output into either positive or
negative saturation. Comparators can be made from ordinary op-amps (and
frequently are), but there are special ICs designed as comparators. They are
designed with very high slew rates and frequently have open-collector
outputs to allow interfacing to logic or bus systems.
Other uses of op-amps include a variety of signal processing applications.
Op-amps are ideally suited to make precise integrators. Integration is the
process of finding the area under a curve, as shown in the Summary of
Theory for Experiment 30. An integrator produces an output voltage that is
proportional to the
integral
of the input voltage waveform. The opposite of
integration is differentiation. Differentiation circuits produce an output that is
