Idealized operational amplifier with saturation:
Supply voltage is either defined by parameter Vps and Vns or by (optional) pins s_p and s_n.
In the first case the necessary power is drawn from an implicit internal supply, in the second case from the external supply.
If initialization is problematic for a model containing this as a component you can set the homotopyType parameter. Using Linear ignores the saturation initially which simplifies the initialization, and may help if the component is connected with negative feedback; but generally fails if the feedback is positive. Using LowerLimit (or UpperLimit) gives a fixed value within the saturation bounds, which works with positive feedback. However, it does not work if the intent is to initialize the input to give a specific output.