Design and analysis of high gain-low power operational-amplifier for bio-medical applications

摘要

This paper represents designing of Operational Amplifier using a composite cascode stage which operating in subthreshold region and gives gain of 97 dB at 20 μW power consumption. The designing is done on Cadence Virtuoso 6.1.5 180 nm process technology with supply voltage 1.8 volt. The circuit eliminated the need of compensation capacitor. The main benefits of the proposed design include high voltage gain, low quiescent current with low power, low noise and reduced hardware. As the proposed architecture use very low power and provide high gain with lower bandwidth range, it is beneficial for bio medical application which required high gain at low power consumption with frequency range of mHz-kHz.