Operational Amplifier with Capacitive Load
Application ID: 16283
An operational amplifier (op-amp) is a differential voltage amplifier with a wide range of applications in analog electronics. This tutorial models an op-amp connected to a feedback loop and a capacitive load.
The op-amp is modeled as an equivalent linear subcircuit in the Electrical Circuit interface, where it is inserted into an outer circuit. The model is partially based on the SPICE format. The model is simulated for 10 ms with data output every 0.05 ms. The internal dynamics of the op-amp interact with the feedback network, causing ringing in the output signal (step response).
This model example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
- COMSOL Multiphysics® and
- either the AC/DC Module, Battery Design Module, MEMS Module, Plasma Module, RF Module, or Semiconductor Module
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.