Low Power Emg Front-End For Face Paralysis

Abstract

Facial paralysis patients have a high risk of loosing the vision of eye, so Functional Electrical Simulation(FES) has the potential to solve this problem but people are looking for the low power to minimize the pain and the low power EMG Extraction device is designed here using an inverter. Inverter based OTA is designed to achieve low power with low voltage supply. This EMG Extractor is designed with UMC 180nm technology consuming 1.5μW with supply of 1V.For designing EMG EXTRACTOR preamplifier is designed as it can bring the signal to the required voltage, then Band pass filter is used as we require strong filtration. Programmable gain amplifier is also used as it provides differential gain and to maintain one level of signal such that ADC can detect the variation. The amplifier circuit unity gain bandwidth is 2.51189 MHz, gain is 63.427 dB, input referred noise of the circuit @ 270 Hz is 91.5858 nV/sqrt(Hz) and @ 470 Hz is 76.8615 nV/sqrt(Hz). The power supply rejection ratio of the circuit is 80 dB. Programmable Gain is achieved from 0 dB to 23 dB @ 47 Hz to 78 Hz. Here all the circuits are operating at a frequency range of 270 Hz to 470 Hz. Area of the amplifier 61.99μW × 79.78 μW, preamplifier and programmable gain amplifier area is 262.73μW × 423.77μW.