Light receiving circuit and photocoupler

A light receiving circuit comprising:

• a light receiving element configured to convert a received optical signal into a current signal and to output the current signal;
• a transimpedance amplifier configured to convert the current signal into a first voltage;
• a delay circuit configured to delay the first voltage;
• and
• a comparator including first, second, and third current control elements each including first, second, and third electrodes and configured to control current of the third electrode by voltage of the second electrode with reference to the first electrode, the first electrodes of the first to third current control elements being commonly connected to current supply means, the first voltage being inputted to the second electrode of the first current control element, output voltage of the delay circuit being inputted to the second electrode of the second current control element, a second voltage being inputted to the second electrode of the third current control element, the comparator being configured to compare output current of the first current control element with sum of output current of the second current control element and output current of the third current control element.