Single-arm two-electrode blood pressuremeasuring device and measuring method thereof

A single-arm two-electrode blood pressure measuring device and measuring method thereof are provided. The single-arm two-electrode blood pressure measuring device includes: two sensing electrodes, a photoplethysmogram (PPG) sensor, an analog signal processing unit, a filter and amplifier unit, an analog-to-digital conversion unit, and a digital signal processing unit. The single-arm two-electrode blood pressure measuring method includes: providing the two sensing electrode to sense an electrocardiography(ECG) signal of an user; providing the PPG sensor to sense a PPG signal; inverting a common mode signal between the two sensing electrodes and outputting to a filter of the analog signal processing unit by a differential amplifier; filtering and amplifying the ECG signal and the PPG signal by the filter and amplifier unit; and obtaining multiple feature points based on the ECG signal and the PPG signal to calculate an estimated blood pressure by the digital signal processing unit.