Optical receiver

An optical receiver comprising:

• a photodetector that receives an optical signal and outputs a current signal corresponding to the received optical signal;
• a transimpedance amplifier that converts the current signal into a voltage signal;
• and
• a limiting amplifier that converts the voltage signal into differential data signals having a certain amplitude difference and includes cascaded multistage amplifiers,
• wherein a first amplifier of the multistage amplifiers comprises:
• first and second transistors that drive differential output terminals in response to signals of differential input terminals;
• and
• resistors that divide a power supply voltage and provide divided power supply voltages to the first and second transistors,
• wherein the first amplifier shares one or more of the resistors with a second amplifier of the multistage amplifiers.

An optical receiver comprising:

• a limiting amplifier that converts an input signal into differential data signals having a certain amplitude difference and includes cascaded multistage amplifiers,
• wherein a first amplifier of the multistage amplifiers comprises:
• first and second transistors that drive differential output terminals in response to signals of differential input terminals;
• first and second load resistor branches that divide a power supply voltage and supply a first divided power supply voltage to the first transistor;
• and
• third and fourth load resistor branches that divide the power supply voltage and supply a second divided power supply voltage to the second transistor,
• wherein the first to fourth load resistor branches include first to fourth nodes, respectively, and one or more of the first to fourth nodes are connected to a second amplifier of the multistage amplifiers.