Quantitative analysis of four EMG amplifiers.
Four typical EMG amplifiers were tested quantitatively to observe the diversity and specificity of available equipment. Gain, phase, common mode rejection ratio (CMRR) and noise characteristics were measured for each device. Various gain and phase responses were observed, each best suited to specific application areas. For all amplifiers, the CMRR was shown to decrease dramatically in the presence of input impedance mismatches of more than 10 k omega between the two electrodes. Because such impedance mismatches are common on the skin surface, these results indicate that proper skin preparation is required to maximize the noise rejection capabilities of the tested amplifiers.
Perreault
E J
EJ
Biomedical Engineering Department, McGill University, Montreal, Québec, Canada.
Hunter
I W
IW
Kearney
R E
RE
D000669:Amplifiers, Electronic / Q000706:statistics & numerical data; D004576:Electromyography / Q000295:instrumentation* / Q000706:statistics & numerical data; D004867:Equipment Design; D005069:Evaluation Studies as Topic