This manuscript describes thedevelopment of a circuit for amplifying surface EMGwith a high input impedance, designed to controlbionic limb prostheses. A peculiarity of using bionicprostheses to control upper and lower limbs is thepresence of a high impedance of contact with theskin, while the equality of resistances in both signallines is not guaranteed, which is due to dryness of theskin. Patients need to be comfortable with bionicprostheses on a daily basis and eliminate the need forspecial treatment of the stump. The authors present adeveloped circuit with additional buffering of inputsignals, the right leg driver circuit, a band-stop filter,and a band pass filter stagger. A software does thecontrol of amplification at the circuit by using adigital potentiometer in the feedback of the outputamplifier. The signal is digitized directly on theamplifier board to reduce the effect of noise onanalog lines. The authors achieved a noise value of20 μV (peak-to-peak) at direct skin contact.
展开▼
