Patent ID: 8121495

Claim:
An optical receiver comprising: a photodiode for generating a photocurrent by receiving an optical signal; a power supply; a sensing resistor; and a current mirror circuit connected between said photodiode and said power supply, said current mirror circuit including, a first input terminal connected with said power supply, a first output terminal connected with said photodiode, a second output terminal connected with said sensing resistor, a first current path inserted between said first input terminal and said first output terminal, said first current path implementing with a first transistor for providing said photocurrent in said first output terminal, a second input terminal for receiving a reference voltage that is directly reflected in said first output to bias said photodiode reversely, and a second current path inserted between said first input terminal and said second output terminal, said second current path implementing with a second transistor for providing a mirror current that mirrors said photocurrent in said second output terminal, said sensing resistor converting said mirror current into a voltage signal to be output from said optical receiver; first and second differential amplifiers, said second differential amplifier commonly driving said first and second transistors and reflecting said reference voltage in said first output by a virtual short circuit between inverting and non-inverting inputs of said second differential amplifier, and said first differential amplifier reflecting said reference voltage reflected in said first output to a current terminal of said second transistor by a virtual short circuit between inverting and non-inverting inputs of said first differential amplifier, wherein said first transistor and said second transistor are biased in a same condition.