This example shows how higher fidelity or more detailed component models can be built from the Foundation library blocks. The model implements a band-limited op-amp. It includes a first-order dynamic from inputs to outputs, and gives much faster simulation than if using a device-level equivalent circuit, which would normally include multiple transistors. This model also includes the effects of input and output impedance (Rin and Rout in the circuit), but does not include nonlinear effects such as slew-rate limiting.
The op-amp is connected open-loop in this circuit, that is, in the form of a differential amplifier. This is to show the effect of the first-order dynamics. Including any feedback will reduce the impact of the dynamics on the circuit input-output response.