Patent ID: 7792435

Claim:
A control device with a switchable bandwidth, the control device comprising: an input coupled to an optical receiver circuit for receiving a controlled variable associated with the optical receiver circuit; an output coupled to an actuator associated with the optical receiver circuit for providing an output signal; an integrating element coupled to the input and including a first capacitance, which is charged and discharged by at least one current, at least one second capacitance, which is selectively coupled to the output and connected in parallel with the first capacitance via a first switch, at least one voltage follower, via which the voltage present at the first capacitance is selectively fed to the second capacitance, means for opening the first switch when the voltage present at the first capacitance is fed to the second capacitance by the voltage follower, and means for closing the first switch to connect the second capacitance in parallel with the first capacitance.