Patent ID: 8153953
Filing Date: 2012-04-10
Classification: H03F

Abstract:
1. A light receiving circuit, comprising: a trans impedance amplifier circuit which is connected to a light receiving element; a current source which supplies a predetermined current; a differential amplifier which operates by the predetermined current to output a current corresponding to a differential signal between a signal outputted from the trans impedance amplifier circuit and a predetermined reference signal; a current mirror unit which outputs a current corresponding to the current outputted from the differential amplifier; a conversion unit which converts the current outputted from the current mirror unit into voltage, comprising first and second conversion elements connected to the current mirror unit; a first logic element comprising a first input end connected to the first conversion element, a second input end, and a first output end to output a negative logical product of signals inputted into the first and second input ends; and a second logic element comprising a third input end connected to the second conversion element, a fourth input end connected the first output end, and a second output end to output a negative logical product of signals inputted into the third and fourth input ends and connected to the second input end.