Fin Field-Effect Transistor (FinFET) Based Low Noise Low Power Chopper Stabilized Capacitively Coupled Amplifier for Biosignal Acquisition System

Design of low power and low noise amplifier for biomedical signal acquisition is quite challenging. In this paper, an inverter based chopper stabilized capacitively coupled amplifier is designed for biomedical applications using 14 nm FinFET technology. Single-stage inverter based amplifier which is used as a core amplifier in the proposed chopper stabilized circuit is designed and compared using different configurations of FinFET and CMOS. Gain and power dissipation is better with fully FinFET based single-stage amplifier when compared with fully CMOS based counterpart. When the FinFET based amplifier is used with capacitive feedback and chopper stabilization circuit, it provides a significant reduction of noise as shown by Noise Efficiency Factor (NEF) of 3.66. The gain in chopper stabilized amplifier is 36.7 dB and bandwidth is in the range of 9.16 Hz–7.6 kHz. The CMRR and PSRR of the designed amplifier are 96.1 dB and 98.5 dB respectively. The power dissipation of the amplifier is 1.24 μ W which is relatively better. In the end, spike reduction circuitry is also used successfully to minimize the spikes in the output signal.