An electronic system (100) for estimating a subject's arterial blood pressure, comprising: a heartbeat detection module (10) configured for receiving an electrocardiogram signal (S1) and detecting a QRS complex of said electrocardiogram signal； a PPG sensor module (20) configured for triggering a light emitter and thereby generating a plurality of samples of a PPG signal (S3)； a blood pressure calculation module (30) configured for receiving information about the detected QRS complexes (S2) and the PPG signal samples (S3) and calculate at least one blood pressure value (SBP, DBP) based on a pulse arrival time period (PAT) between the electrocardiogram and the PPG signal； wherein the PPG sensor module (20) is further configured for receiving information about the detected QRS complexes (S2), for triggering, each time a QRS complex is detected, the generation of a plurality of samples of a PPG signal (S31 to S34) and for determining a PPG signal acquisition period (PT1 to PT4).
