Design of the ultra low power, low area occupied amplifier for recording biomedical signals in the single Hz bandwidth

Abstract

We report on design of the amplifier dedicated to recording very low frequency biomedical signals. As the amplifier is used in multichannel integrated circuit dedicated to biomedical signals acquisition its key requirements are very low power consumption and low area occupation. The amplifier is designed in 180 nm CMOS process, occupies 58×55 μm2, and allows to set its bandwidth in the single Hz range. It is supplied from 1.8 V and is characterized by sub μW power consumption. The amplifier is controlled by 6-bit correction DAC to set bandwidth required for a given recordings. The paper presents our former measurement results and describes encountered problems. The design of amplifier is provided with emphasis on its limits. Additionally, the simulation results are also given.