12/08/2026
OPAMP controllers use operational amplifiers, resistors, and capacitors to implement common control actions in analog control systems.
A P (Proportional) controller produces an output proportional to the error signal, giving a fast and direct response.
An I (Integral) controller accumulates error over time and helps eliminate steady-state error.
A PD (Proportional-Derivative) controller adds derivative action, improving response speed and damping.
A PI (Proportional-Integral) controller combines fast proportional action with integral action to reduce steady-state error.
A PID controller combines all three actions for improved speed, accuracy, and stability.
Lead/lag controllers shape the system response by adding phase lead or lag, while a lag-lead controller combines both effects.
These circuits demonstrate how practical op-amp networks can realize different control-system transfer functions.
