Common base circuit with output compensation, current-to-voltage circuit configured with common base amplifier, and optical receiver implemented with the same

A current-to-voltage converter, comprising:

• a common base circuit including a first transistor operating in a common base arrangement, the first transistor receiving an input current in an emitter thereof and generating a first current flowing therein;
• a current shunt for shunting a second current from the first current depending on an average of an output of the amplifier;
• a current supplement for supplying a third current to the first current, the third current being substantially equal to the second current shunt by the current shunt;
• and
• a detector for detecting the average of the output of the amplifier,
• wherein the detector drives the second transistor and the third transistor.

An optical receiver for receiving an optical signal by a photodiode and outputting an output signal corresponding to the optical signal, the optical receiving comprising:

• a pre-amplifier for converting a photocurrent generated in the photodiode into a voltage signal, the pre-amplifier including,
• a common base circuit including a first transistor operating in a common base arrangement, the first transistor receiving an input current in an emitter thereof and generating a first current flowing therein,
• a current shunt for shunting a second current from the first current depending on an average of the voltage signal output from the pre-amplifier;
• a current supplement for supplying a third current to the first current, the third current being substantially equal to the second current shunt by the current shunt, and
• a detector for detecting the average of the voltage signal and driving the second transistor and the third transistor;
• a plurality of differential amplifiers provided in downstream of the pre-amplifier;
• and
• an offset compensator for compensating an output offset of the optical receiver.