Biomedical signal amplifier for EMG wireless sensor system

This work presents differential amplifier designated as a part of modular biomedical sensor system (MBSS) used for EMG (electromyography) signal measurements. Except the standard features which characterize this type of device (high gain, low noise), some special requirements comprising very low supply voltage and low power consumption could be reached by application of the described amplifier. The amplifier provides switch-able 60/80dB gain at 15 Hz - 1kHz frequency bandwidth. A fourth order anti-aliasing filter for next processing block (AD converter) is included as well.