Receiving circuit having a switch for changing the generated reference voltage to one of a first and a second threshold value

摘要

According to a receiving circuit includes a light receiving element, a signal voltage generation portion, a comparator, a reference voltage generation portion and a switch. The light receiving element receives a light signal and outputs a light current corresponding to the light signal. The signal voltage generation portion converts the light current into a signal voltage and outputs the signal voltage. The comparator compares the signal voltage with a first threshold value or a second threshold value. The reference voltage generation portion outputs a reference voltage input to the comparator. The switch changes the reference voltage to one of the first threshold value and the second threshold value based on an output of the comparator.

主权项

1. A receiving circuit comprising:
a light receiving element receiving a light signal and outputting a light current corresponding to the light signal; a signal voltage generation portion converting the light current into a signal voltage and outputting the signal voltage; a comparator comparing the signal voltage with a first threshold value or a second threshold value; a reference voltage generation portion outputting a reference voltage input to the comparator; and a switch changing the reference voltage to one of the first threshold value and the second threshold value based on an output of the comparator.