An Ultra Low Power Low noise Operational Transconductance Amplifier for Biomedical Front-end Applications

This work represents a novel low noise amplifier, designed for biomedical front-end applications. The proposed circuit is designed using 180 nm CMOS technology. The simulation results exhibit very good performance showing a gain of 57.9 dB and unity gain bandwidth of 330 KHz. The proposed design shows enhanced phase margin of 84 degree due to its sub-threshold region of operation for the devices. The circuit performs under the supply voltage of 1.8 V and consumes only 400 nW of DC Power. The input-referred noise voltage of the designed circuit is obtained as$0.6\mu V/\sqrt {HZ} $ at 5 KHz, which makes it suitable for biomedical applications. Also, the CMRR of the designed circuit is obtained as 82.6 dB.