关键字:心电图、二级放大、右腿驱动、MSP430
Abstract
The thesis mainly introduced the design of a system, which can be used to detect and depict the electrocardiogram (ECG). The system comprises three pacts: the detecting of ECG, A/D converter and LCD display. The source of electrocardiogram is in the performance of high resistance, small magnitude and low frequency, due to which the amplificatory circuit, low-pass filter are used to amplify the signal and attenuate the bandwidth; Also the Driven-Right-Leg Circuit and the Driven Cable technique are used to attenuate the common-mode disturbance. After the process of what mentioned above, the microprocessor can convert and display the ECG. In this design, AD620 is the core device of the amplification; MSP430 is used as microprocessor; RT12864M is used for the display of ECG.