List of top Sensors and Bioinstrumentation Questions on Bio potentials and its measurement techniques asked in GATE BM

The table below shows the average values of the power spectral density (PSD) of an EEG signal in different frequency bands.

Frequency bands (Hertz)	Average PSD (microvolts2/Hertz)
0.4 - 4.0	3
4.0 - 8.0	4
8.0 - 13.0	8
13.0 - 30.0	5
30.0 - 100.0	3

The PSD of the EEG signal has a noise floor of 2 microvolts²/Hertz. The signal to noise ratio for the alpha-band, expressed in decibels, is

In comparison to ECG amplifiers, the surface-EMG amplifiers have