Method for calibrating external light for bio-signal measurement, and electronic device and storage medium therefor

A wearable electronic device, comprising:

• at least one light receiving unit;
• at least one light emitting unit;
• an external light calibration circuit;
• and
• a processor electrically connected with the at least one light receiving unit, at least one light emitting unit, and the external light calibration circuit,
• wherein the processor is configured to:
• control the at least one light emitting unit to radiate light during first periods, and not emit light during second periods,
• respectively detect a first light during the first periods and a second light during the second periods through the at least one light receiving unit, and
• remove, by the external light calibration circuit, a second light signal, which corresponds to the second light detected during the second periods, from a first light signal, which corresponds to the first light and includes biometric information during the first periods,
• wherein the external light calibration circuit is configured to receive the second light signal every second period and remove the second light signal from the first light signal every first period, and
• wherein the external light calibration circuit includes:
• a filter configured to filter the second light signal corresponding to detected second light, thereby resulting in a filtered light signal;
• a proportional integral deviate (PID) controller configured to generate a control signal for removing the filtered light signal output from the filter;
• an inverter configured to apply a voltage signal corresponding to the control signal;
• and
• a current pump configured to apply a current signal corresponding to the voltage signal from the inverter to the at least one light receiving unit.