Patent ID: 8055139

Claim:
A light receiver comprising: a photodiode converting an optical signal into an electrical signal; a plurality of amplifiers respectively having different gains, each input end of the plurality of amplifiers receiving the electrical signal from one end of the photodiode, and at least one of the plurality of amplifiers being in an operating state for outputting an output signal while at least one of a remaining number of the plurality of amplifiers being in a non-operating state; and a diode providing the electrical signal from the photodiode to one of the plurality of amplifiers, wherein a terminal of a first polarity type of the photodiode is connected with a terminal of the first polarity type of the diode, and a second terminal of a second polarity type of the diode is connected with the input end of the one of the amplifiers, the first polarity type being opposite to that of the second polarity type, to thereby place the diode in a high-impedance state and be substantially zero biased when the one of the amplifiers is in the non-operating state.