Electronic device and operating method of electronic device

An operating method of an electronic device which includes a light source and a light sensor, the method comprising:

• sensing a first current amount by turning off the light source and using the light sensor during a first time interval;
• canceling a current corresponding to the first current amount from an output of the light sensor during a second time interval and a third time interval;
• sensing a second current amount by using the light sensor during the second time interval;
• and
• during the third time interval, emitting a light by turning on the light source and sensing a third current amount by using the light sensor.

An electronic device comprising:

• a photoplethysmography device configured to output a photoplethysmography signal;
• and
• a processor configured to receive the photoplethysmography signal from the photoplethysmography device and to communicate the photoplethysmography signal to an external device, wherein the photoplethysmography device comprises:
• a light source;
• a light sensor;
• and
• a controller configured to perform sensing by turning off the light source and using the light sensor to sense an amount of a coarse ambient light, in a coarse mode,
• wherein, during canceling a current corresponding to the amount of the coarse ambient light from an output of the light sensor, the controller is configured to:
• sense an amount of a fine ambient light by performing sensing by using the light sensor in a fine mode;
• and
• sense an amount of a target light by performing sensing by turning on the light source and using the light sensor while the light source emits a light.