Patent attributes
An optical signal receiving circuit, may include a first transimpedance amplifier configured to convert a first current signal into a first voltage signal, wherein the first current signal generated in a first photodiode, to which an optical signal is inputted; a second transimpedance amplifier configured to convert a second current signal into a second voltage signal, wherein the second current signal generated in a second photodiode, to which an optical signal is inputted; a noise detection circuit configured to detect a noise signal of the second voltage signal, and configured to shift at least one of the first voltage and the second voltage in order to widen a voltage difference between the first voltage signal and the second voltage signal when the noise signal of the second voltage signal is detected; and a first comparator having as inputs the first voltage signal and the second voltage signal, and configured to generate a digital signal based on the first voltage signal and the second voltage signal.
