Patent ID: 7421213

Claim:
An optical receiver circuit comprising: an illuminatable photodiode; a first preamplifier for amplifying a first output signal generated by the illuminatable photodiode; a non-illuminatable photodiode for simulating the electrical behavior of the illuminatable photodiode in an illumination-free case; a second preamplifier for amplifying a second output signal generated by the non-illuminatable photodiode; a postamplifier, having a first input and a second input, the first input being connected to receive the first output signal of the illuminatable photodiode amplified in the first preamplifier, and the second input being connected to receive the second output signal of the non-illuminatable photodiode amplified in the second preamplifier, and a control device including: an integrating element with a first capacitance, which is alternatively charged and discharged by an output signal of the postamplifier, at least one second capacitance, which is selectively 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; wherein the second preamplifier and the postamplifier form a part of a controlled system, wherein the output signal of the postamplifier is fed to the control device as a controlled variable, and wherein the output of the control device controls an actuator of the controlled system.