a control device for servocontrolling an object to a given position includes a motor , a coder connected to the motor , and a rig connected to the coder and the motor , the rig including a counter and a subtractor which generate a position discrepancy signal on the basis of an output of the coder and an external set - point signal input to the subcontractor ; circuit paths each having a sampling device which receives the position discrepancy signal and samples this signal at a distinct frequency , each circuit path performing a different degree of differentiation ; a summing unit for receiving and summing outputs of each of the circuit paths ; and an amplifier for receiving an output of the summing unit and outputting a control signal which controls the motor .