Design of Ultra Low Power Operational Amplifier for Biomedical Circuits

This paper presents, an ultra low power operational amplifier designed using 180 nm CMOS technology for analog front ends of biomedical devices. The low power is achieved by operating the transistors in the subthreshold region. The designed opamp operates at 0.8 V single power supply voltage with a maximum power consumption of 23.47 nW and provides a DC gain of about 64.63 dB along with a unity gain bandwidth up to about 14.61 kHz. The layout of the proposed opamp design is also measured which is 0.7 \(\upmu \) m \(^2\) . The obtained results of the proposed design are compared with the previous design and our design shows significant improvement in the performance parameters.