Patent ID: 7787780
Filing Date: 2010-08-31
Classification: H03F

Abstract:
1. An optical signal receiving circuit, comprising: a first transimpedance amplifier configured to convert a first current signal into a first voltage signal, wherein the first current signal is generated in a first photodiode, to which an optical signal is input; a second transimpedance amplifier configured to convert a second current signal into a second voltage signal, wherein the second current signal is generated in a second photodiode, to which an optical signal is input; 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 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, wherein the noise detection circuit includes: wherein the reference voltage generation circuit includes: