Patent ID: 7514665

Claim:
A light-receiving amplifier circuit, comprising: a differential amplifier circuit; a gain resistor connected between an inverting input unit of said differential amplifier circuit and an output of said differential amplifier circuit; light-receiving elements, each of said light-receiving elements generating a photocurrent according to an amount of light received; a plurality of switches, each switch of said plurality of switches being connected between an output of a corresponding light-receiving element and said inverting input unit of said differential amplifier circuit, to select the corresponding light-receiving element as a light-receiving element for supplying said photocurrent to said differential amplifier; and a plurality of rectifier cells, each rectifier cell of said plurality of rectifier cells preventing a photocurrent generated by a non-corresponding light-receiving element, that is not selected, from flowing to the inverting input unit, wherein an end of each of said rectifier cells is serially connected to a corresponding one of said light-receiving elements and a respective other end of each of said rectifier cells are commonly connected to said inverting input unit, and wherein each of said switches is connected to a connection point between a corresponding rectifier cell and said corresponding light-receiving elements.