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 current-to-voltage converter, the current shunt including a second transistor operated in the common base arrangement to flow the second current therein;
• a current supplement for supplying a third current to the first current, the current supplement including a third transistor to flow the third current therein;
• and
• a detector for detecting the average of an output of the common base circuit,
• wherein the detector drives the second transistor and the third transistor by the average of the output common base circuit, and
• wherein the second current shut by the current shut is substantially equal to the third current supplied from the current supplement.

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

• a pre-amplifier for converting a photocurrent generated by 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 the photocurrent 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, the current shunt including a second transistor operating the common base arrangement, the second transistor flowing the second current therein;
• a current supplement for supplying a third current to the first current, the current supplement including a third transistor to flow the third current therein, 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,
• wherein the third current is substantially equal to the second current shunt by the current shunt.